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6ad4c18884
Since (e761b77: cpu hotplug, sched: Introduce cpu_active_map and redo
sched domain managment) we have cpu_active_mask which is suppose to rule
scheduler migration and load-balancing, except it never (fully) did.
The particular problem being solved here is a crash in try_to_wake_up()
where select_task_rq() ends up selecting an offline cpu because
select_task_rq_fair() trusts the sched_domain tree to reflect the
current state of affairs, similarly select_task_rq_rt() trusts the
root_domain.
However, the sched_domains are updated from CPU_DEAD, which is after the
cpu is taken offline and after stop_machine is done. Therefore it can
race perfectly well with code assuming the domains are right.
Cure this by building the domains from cpu_active_mask on
CPU_DOWN_PREPARE.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
901 lines
25 KiB
C
901 lines
25 KiB
C
#ifndef __LINUX_CPUMASK_H
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#define __LINUX_CPUMASK_H
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/*
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* Cpumasks provide a bitmap suitable for representing the
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* set of CPU's in a system, one bit position per CPU number. In general,
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* only nr_cpu_ids (<= NR_CPUS) bits are valid.
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*/
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/bitmap.h>
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typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
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/**
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* cpumask_bits - get the bits in a cpumask
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* @maskp: the struct cpumask *
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*
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* You should only assume nr_cpu_ids bits of this mask are valid. This is
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* a macro so it's const-correct.
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*/
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#define cpumask_bits(maskp) ((maskp)->bits)
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#if NR_CPUS == 1
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#define nr_cpu_ids 1
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#else
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extern int nr_cpu_ids;
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#endif
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#ifdef CONFIG_CPUMASK_OFFSTACK
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/* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
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* not all bits may be allocated. */
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#define nr_cpumask_bits nr_cpu_ids
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#else
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#define nr_cpumask_bits NR_CPUS
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#endif
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/*
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* The following particular system cpumasks and operations manage
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* possible, present, active and online cpus.
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*
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* cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
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* cpu_present_mask - has bit 'cpu' set iff cpu is populated
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* cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
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* cpu_active_mask - has bit 'cpu' set iff cpu available to migration
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*
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* If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
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*
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* The cpu_possible_mask is fixed at boot time, as the set of CPU id's
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* that it is possible might ever be plugged in at anytime during the
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* life of that system boot. The cpu_present_mask is dynamic(*),
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* representing which CPUs are currently plugged in. And
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* cpu_online_mask is the dynamic subset of cpu_present_mask,
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* indicating those CPUs available for scheduling.
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*
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* If HOTPLUG is enabled, then cpu_possible_mask is forced to have
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* all NR_CPUS bits set, otherwise it is just the set of CPUs that
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* ACPI reports present at boot.
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*
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* If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
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* depending on what ACPI reports as currently plugged in, otherwise
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* cpu_present_mask is just a copy of cpu_possible_mask.
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*
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* (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
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* hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
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*
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* Subtleties:
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* 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
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* assumption that their single CPU is online. The UP
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* cpu_{online,possible,present}_masks are placebos. Changing them
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* will have no useful affect on the following num_*_cpus()
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* and cpu_*() macros in the UP case. This ugliness is a UP
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* optimization - don't waste any instructions or memory references
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* asking if you're online or how many CPUs there are if there is
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* only one CPU.
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*/
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extern const struct cpumask *const cpu_possible_mask;
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extern const struct cpumask *const cpu_online_mask;
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extern const struct cpumask *const cpu_present_mask;
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extern const struct cpumask *const cpu_active_mask;
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#if NR_CPUS > 1
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#define num_online_cpus() cpumask_weight(cpu_online_mask)
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#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
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#define num_present_cpus() cpumask_weight(cpu_present_mask)
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#define num_active_cpus() cpumask_weight(cpu_active_mask)
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#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
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#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
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#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
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#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
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#else
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#define num_online_cpus() 1
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#define num_possible_cpus() 1
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#define num_present_cpus() 1
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#define num_active_cpus() 1
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#define cpu_online(cpu) ((cpu) == 0)
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#define cpu_possible(cpu) ((cpu) == 0)
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#define cpu_present(cpu) ((cpu) == 0)
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#define cpu_active(cpu) ((cpu) == 0)
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#endif
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/* verify cpu argument to cpumask_* operators */
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static inline unsigned int cpumask_check(unsigned int cpu)
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{
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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WARN_ON_ONCE(cpu >= nr_cpumask_bits);
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#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
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return cpu;
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}
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#if NR_CPUS == 1
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/* Uniprocessor. Assume all masks are "1". */
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static inline unsigned int cpumask_first(const struct cpumask *srcp)
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{
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return 0;
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}
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/* Valid inputs for n are -1 and 0. */
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static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
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{
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return n+1;
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}
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static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
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{
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return n+1;
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}
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static inline unsigned int cpumask_next_and(int n,
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const struct cpumask *srcp,
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const struct cpumask *andp)
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{
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return n+1;
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}
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/* cpu must be a valid cpu, ie 0, so there's no other choice. */
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static inline unsigned int cpumask_any_but(const struct cpumask *mask,
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unsigned int cpu)
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{
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return 1;
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}
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#define for_each_cpu(cpu, mask) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
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#define for_each_cpu_and(cpu, mask, and) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
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#else
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/**
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* cpumask_first - get the first cpu in a cpumask
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* @srcp: the cpumask pointer
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*
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* Returns >= nr_cpu_ids if no cpus set.
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*/
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static inline unsigned int cpumask_first(const struct cpumask *srcp)
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{
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return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
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}
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/**
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* cpumask_next - get the next cpu in a cpumask
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* @n: the cpu prior to the place to search (ie. return will be > @n)
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* @srcp: the cpumask pointer
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*
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* Returns >= nr_cpu_ids if no further cpus set.
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*/
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static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
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{
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/* -1 is a legal arg here. */
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if (n != -1)
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cpumask_check(n);
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return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
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}
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/**
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* cpumask_next_zero - get the next unset cpu in a cpumask
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* @n: the cpu prior to the place to search (ie. return will be > @n)
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* @srcp: the cpumask pointer
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*
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* Returns >= nr_cpu_ids if no further cpus unset.
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*/
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static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
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{
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/* -1 is a legal arg here. */
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if (n != -1)
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cpumask_check(n);
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return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
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}
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int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
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int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
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/**
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* for_each_cpu - iterate over every cpu in a mask
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* @cpu: the (optionally unsigned) integer iterator
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* @mask: the cpumask pointer
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu(cpu, mask) \
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for ((cpu) = -1; \
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(cpu) = cpumask_next((cpu), (mask)), \
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(cpu) < nr_cpu_ids;)
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/**
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* for_each_cpu_and - iterate over every cpu in both masks
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* @cpu: the (optionally unsigned) integer iterator
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* @mask: the first cpumask pointer
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* @and: the second cpumask pointer
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*
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* This saves a temporary CPU mask in many places. It is equivalent to:
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* struct cpumask tmp;
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* cpumask_and(&tmp, &mask, &and);
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* for_each_cpu(cpu, &tmp)
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* ...
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu_and(cpu, mask, and) \
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for ((cpu) = -1; \
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(cpu) = cpumask_next_and((cpu), (mask), (and)), \
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(cpu) < nr_cpu_ids;)
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#endif /* SMP */
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#define CPU_BITS_NONE \
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{ \
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[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
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}
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#define CPU_BITS_CPU0 \
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{ \
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[0] = 1UL \
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}
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/**
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* cpumask_set_cpu - set a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
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{
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set_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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/**
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* cpumask_clear_cpu - clear a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
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{
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clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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/**
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* cpumask_test_cpu - test for a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* No static inline type checking - see Subtlety (1) above.
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*/
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#define cpumask_test_cpu(cpu, cpumask) \
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test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
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/**
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* cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* test_and_set_bit wrapper for cpumasks.
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*/
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static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
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{
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return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
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}
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/**
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* cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* test_and_clear_bit wrapper for cpumasks.
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*/
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static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
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{
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return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
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}
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/**
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* cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_setall(struct cpumask *dstp)
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{
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bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
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}
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/**
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* cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_clear(struct cpumask *dstp)
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{
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bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
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}
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/**
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* cpumask_and - *dstp = *src1p & *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline int cpumask_and(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_or - *dstp = *src1p | *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_xor - *dstp = *src1p ^ *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline void cpumask_xor(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_andnot - *dstp = *src1p & ~*src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline int cpumask_andnot(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_complement - *dstp = ~*srcp
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* @dstp: the cpumask result
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* @srcp: the input to invert
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*/
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static inline void cpumask_complement(struct cpumask *dstp,
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const struct cpumask *srcp)
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{
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bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
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nr_cpumask_bits);
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}
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/**
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* cpumask_equal - *src1p == *src2p
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline bool cpumask_equal(const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
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nr_cpumask_bits);
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}
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/**
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* cpumask_intersects - (*src1p & *src2p) != 0
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline bool cpumask_intersects(const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
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nr_cpumask_bits);
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}
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/**
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* cpumask_subset - (*src1p & ~*src2p) == 0
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline int cpumask_subset(const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
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nr_cpumask_bits);
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}
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/**
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* cpumask_empty - *srcp == 0
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* @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
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*/
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static inline bool cpumask_empty(const struct cpumask *srcp)
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{
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return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
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}
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/**
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* cpumask_full - *srcp == 0xFFFFFFFF...
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* @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
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*/
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static inline bool cpumask_full(const struct cpumask *srcp)
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{
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return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
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}
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/**
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* cpumask_weight - Count of bits in *srcp
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* @srcp: the cpumask to count bits (< nr_cpu_ids) in.
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*/
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static inline unsigned int cpumask_weight(const struct cpumask *srcp)
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{
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return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
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}
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/**
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* cpumask_shift_right - *dstp = *srcp >> n
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* @dstp: the cpumask result
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* @srcp: the input to shift
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* @n: the number of bits to shift by
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*/
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static inline void cpumask_shift_right(struct cpumask *dstp,
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const struct cpumask *srcp, int n)
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{
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bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
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nr_cpumask_bits);
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}
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/**
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* cpumask_shift_left - *dstp = *srcp << n
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* @dstp: the cpumask result
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* @srcp: the input to shift
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* @n: the number of bits to shift by
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*/
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static inline void cpumask_shift_left(struct cpumask *dstp,
|
|
const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_copy - *dstp = *srcp
|
|
* @dstp: the result
|
|
* @srcp: the input cpumask
|
|
*/
|
|
static inline void cpumask_copy(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
|
|
bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_any - pick a "random" cpu from *srcp
|
|
* @srcp: the input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any(srcp) cpumask_first(srcp)
|
|
|
|
/**
|
|
* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
|
|
*/
|
|
#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
|
|
|
|
/**
|
|
* cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
|
|
* @mask1: the first input cpumask
|
|
* @mask2: the second input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
|
|
|
|
/**
|
|
* cpumask_of - the cpumask containing just a given cpu
|
|
* @cpu: the cpu (<= nr_cpu_ids)
|
|
*/
|
|
#define cpumask_of(cpu) (get_cpu_mask(cpu))
|
|
|
|
/**
|
|
* cpumask_scnprintf - print a cpumask into a string as comma-separated hex
|
|
* @buf: the buffer to sprintf into
|
|
* @len: the length of the buffer
|
|
* @srcp: the cpumask to print
|
|
*
|
|
* If len is zero, returns zero. Otherwise returns the length of the
|
|
* (nul-terminated) @buf string.
|
|
*/
|
|
static inline int cpumask_scnprintf(char *buf, int len,
|
|
const struct cpumask *srcp)
|
|
{
|
|
return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_parse_user - extract a cpumask from a user string
|
|
* @buf: the buffer to extract from
|
|
* @len: the length of the buffer
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpumask_parse_user(const char __user *buf, int len,
|
|
struct cpumask *dstp)
|
|
{
|
|
return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpulist_scnprintf - print a cpumask into a string as comma-separated list
|
|
* @buf: the buffer to sprintf into
|
|
* @len: the length of the buffer
|
|
* @srcp: the cpumask to print
|
|
*
|
|
* If len is zero, returns zero. Otherwise returns the length of the
|
|
* (nul-terminated) @buf string.
|
|
*/
|
|
static inline int cpulist_scnprintf(char *buf, int len,
|
|
const struct cpumask *srcp)
|
|
{
|
|
return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpulist_parse_user - extract a cpumask from a user string of ranges
|
|
* @buf: the buffer to extract from
|
|
* @len: the length of the buffer
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
|
|
{
|
|
return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_size - size to allocate for a 'struct cpumask' in bytes
|
|
*
|
|
* This will eventually be a runtime variable, depending on nr_cpu_ids.
|
|
*/
|
|
static inline size_t cpumask_size(void)
|
|
{
|
|
/* FIXME: Once all cpumask assignments are eliminated, this
|
|
* can be nr_cpumask_bits */
|
|
return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
|
|
}
|
|
|
|
/*
|
|
* cpumask_var_t: struct cpumask for stack usage.
|
|
*
|
|
* Oh, the wicked games we play! In order to make kernel coding a
|
|
* little more difficult, we typedef cpumask_var_t to an array or a
|
|
* pointer: doing &mask on an array is a noop, so it still works.
|
|
*
|
|
* ie.
|
|
* cpumask_var_t tmpmask;
|
|
* if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
|
|
* return -ENOMEM;
|
|
*
|
|
* ... use 'tmpmask' like a normal struct cpumask * ...
|
|
*
|
|
* free_cpumask_var(tmpmask);
|
|
*/
|
|
#ifdef CONFIG_CPUMASK_OFFSTACK
|
|
typedef struct cpumask *cpumask_var_t;
|
|
|
|
bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
|
|
void free_cpumask_var(cpumask_var_t mask);
|
|
void free_bootmem_cpumask_var(cpumask_var_t mask);
|
|
|
|
#else
|
|
typedef struct cpumask cpumask_var_t[1];
|
|
|
|
static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
|
|
{
|
|
}
|
|
|
|
static inline void free_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
|
|
static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
#endif /* CONFIG_CPUMASK_OFFSTACK */
|
|
|
|
/* It's common to want to use cpu_all_mask in struct member initializers,
|
|
* so it has to refer to an address rather than a pointer. */
|
|
extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
|
|
#define cpu_all_mask to_cpumask(cpu_all_bits)
|
|
|
|
/* First bits of cpu_bit_bitmap are in fact unset. */
|
|
#define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
|
|
|
|
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
|
|
#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
|
|
#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
|
|
|
|
/* Wrappers for arch boot code to manipulate normally-constant masks */
|
|
void set_cpu_possible(unsigned int cpu, bool possible);
|
|
void set_cpu_present(unsigned int cpu, bool present);
|
|
void set_cpu_online(unsigned int cpu, bool online);
|
|
void set_cpu_active(unsigned int cpu, bool active);
|
|
void init_cpu_present(const struct cpumask *src);
|
|
void init_cpu_possible(const struct cpumask *src);
|
|
void init_cpu_online(const struct cpumask *src);
|
|
|
|
/**
|
|
* to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
|
|
* @bitmap: the bitmap
|
|
*
|
|
* There are a few places where cpumask_var_t isn't appropriate and
|
|
* static cpumasks must be used (eg. very early boot), yet we don't
|
|
* expose the definition of 'struct cpumask'.
|
|
*
|
|
* This does the conversion, and can be used as a constant initializer.
|
|
*/
|
|
#define to_cpumask(bitmap) \
|
|
((struct cpumask *)(1 ? (bitmap) \
|
|
: (void *)sizeof(__check_is_bitmap(bitmap))))
|
|
|
|
static inline int __check_is_bitmap(const unsigned long *bitmap)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Special-case data structure for "single bit set only" constant CPU masks.
|
|
*
|
|
* We pre-generate all the 64 (or 32) possible bit positions, with enough
|
|
* padding to the left and the right, and return the constant pointer
|
|
* appropriately offset.
|
|
*/
|
|
extern const unsigned long
|
|
cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
|
|
|
|
static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
|
|
{
|
|
const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
|
|
p -= cpu / BITS_PER_LONG;
|
|
return to_cpumask(p);
|
|
}
|
|
|
|
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
|
|
}
|
|
|
|
#else /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
|
|
}
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
/*
|
|
*
|
|
* From here down, all obsolete. Use cpumask_ variants!
|
|
*
|
|
*/
|
|
#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
|
|
/* These strip const, as traditionally they weren't const. */
|
|
#define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
|
|
#define cpu_online_map (*(cpumask_t *)cpu_online_mask)
|
|
#define cpu_present_map (*(cpumask_t *)cpu_present_mask)
|
|
#define cpu_active_map (*(cpumask_t *)cpu_active_mask)
|
|
|
|
#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
|
|
|
|
#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
|
|
} }
|
|
|
|
#else
|
|
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
|
|
} }
|
|
|
|
#endif
|
|
|
|
#define CPU_MASK_NONE \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
|
|
} }
|
|
|
|
#define CPU_MASK_CPU0 \
|
|
(cpumask_t) { { \
|
|
[0] = 1UL \
|
|
} }
|
|
|
|
#if NR_CPUS == 1
|
|
#define first_cpu(src) ({ (void)(src); 0; })
|
|
#define next_cpu(n, src) ({ (void)(src); 1; })
|
|
#define any_online_cpu(mask) 0
|
|
#define for_each_cpu_mask(cpu, mask) \
|
|
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
|
|
#else /* NR_CPUS > 1 */
|
|
int __first_cpu(const cpumask_t *srcp);
|
|
int __next_cpu(int n, const cpumask_t *srcp);
|
|
int __any_online_cpu(const cpumask_t *mask);
|
|
|
|
#define first_cpu(src) __first_cpu(&(src))
|
|
#define next_cpu(n, src) __next_cpu((n), &(src))
|
|
#define any_online_cpu(mask) __any_online_cpu(&(mask))
|
|
#define for_each_cpu_mask(cpu, mask) \
|
|
for ((cpu) = -1; \
|
|
(cpu) = next_cpu((cpu), (mask)), \
|
|
(cpu) < NR_CPUS; )
|
|
#endif /* SMP */
|
|
|
|
#if NR_CPUS <= 64
|
|
|
|
#define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
|
|
|
|
#else /* NR_CPUS > 64 */
|
|
|
|
int __next_cpu_nr(int n, const cpumask_t *srcp);
|
|
#define for_each_cpu_mask_nr(cpu, mask) \
|
|
for ((cpu) = -1; \
|
|
(cpu) = __next_cpu_nr((cpu), &(mask)), \
|
|
(cpu) < nr_cpu_ids; )
|
|
|
|
#endif /* NR_CPUS > 64 */
|
|
|
|
#define cpus_addr(src) ((src).bits)
|
|
|
|
#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
|
|
static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
|
|
{
|
|
set_bit(cpu, dstp->bits);
|
|
}
|
|
|
|
#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
|
|
static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
|
|
{
|
|
clear_bit(cpu, dstp->bits);
|
|
}
|
|
|
|
#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
|
|
static inline void __cpus_setall(cpumask_t *dstp, int nbits)
|
|
{
|
|
bitmap_fill(dstp->bits, nbits);
|
|
}
|
|
|
|
#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
|
|
static inline void __cpus_clear(cpumask_t *dstp, int nbits)
|
|
{
|
|
bitmap_zero(dstp->bits, nbits);
|
|
}
|
|
|
|
/* No static inline type checking - see Subtlety (1) above. */
|
|
#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
|
|
|
|
#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
|
|
static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
|
|
{
|
|
return test_and_set_bit(cpu, addr->bits);
|
|
}
|
|
|
|
#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
|
|
static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
|
|
static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
|
|
static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_andnot(dst, src1, src2) \
|
|
__cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
|
|
static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
|
|
static inline int __cpus_equal(const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
return bitmap_equal(src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
|
|
static inline int __cpus_intersects(const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
return bitmap_intersects(src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
|
|
static inline int __cpus_subset(const cpumask_t *src1p,
|
|
const cpumask_t *src2p, int nbits)
|
|
{
|
|
return bitmap_subset(src1p->bits, src2p->bits, nbits);
|
|
}
|
|
|
|
#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
|
|
static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
|
|
{
|
|
return bitmap_empty(srcp->bits, nbits);
|
|
}
|
|
|
|
#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
|
|
static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
|
|
{
|
|
return bitmap_weight(srcp->bits, nbits);
|
|
}
|
|
|
|
#define cpus_shift_left(dst, src, n) \
|
|
__cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
|
|
static inline void __cpus_shift_left(cpumask_t *dstp,
|
|
const cpumask_t *srcp, int n, int nbits)
|
|
{
|
|
bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
|
|
}
|
|
#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
|
|
|
|
#endif /* __LINUX_CPUMASK_H */
|