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x86: Replace cpu_2_logical_apicid[] with early percpu variable

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Unlike x86_64, on x86_32, the mapping from cpu to logical apicid
may vary depending on apic in use.  cpu_2_logical_apicid[] array
is used for this mapping.  Replace it with early percpu variable
x86_cpu_to_logical_apicid to make it better aligned with other
mappings.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: eric.dumazet@gmail.com
Cc: yinghai@kernel.org
Cc: brgerst@gmail.com
Cc: gorcunov@gmail.com
Cc: penberg@kernel.org
Cc: shaohui.zheng@intel.com
Cc: rientjes@google.com
LKML-Reference: <1295789862-25482-5-git-send-email-tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2011-01-23 14:37:30 +01:00 committed by Ingo Molnar
parent 1245e1668c
commit 4c321ff8a0
8 changed files with 27 additions and 13 deletions
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4
arch/x86/include/asm/apic.h
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@ -595,8 +595,4 @@ extern int default_check_phys_apicid_present(int phys_apicid);
#endif /* CONFIG_X86_LOCAL_APIC */
#ifdef CONFIG_X86_32
extern u8 cpu_2_logical_apicid[NR_CPUS];
#endif
#endif /* _ASM_X86_APIC_H */

3
arch/x86/include/asm/smp.h
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@ -38,6 +38,9 @@ static inline struct cpumask *cpu_core_mask(int cpu)
DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
#if defined(CONFIG_SMP) && defined(CONFIG_X86_32)
DECLARE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid);
#endif
/* Static state in head.S used to set up a CPU */
extern struct {

11
arch/x86/kernel/apic/apic.c
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@ -78,6 +78,17 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
#ifdef CONFIG_X86_32
#ifdef CONFIG_SMP
/*
* On x86_32, the mapping between cpu and logical apicid may vary
* depending on apic in use. The following early percpu variable is
* used for the mapping. This is where the behaviors of x86_64 and 32
* actually diverge. Let's keep it ugly for now.
*/
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid, BAD_APICID);
#endif
/*
* Knob to control our willingness to enable the local APIC.
*

2
arch/x86/kernel/apic/es7000_32.c
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@ -534,7 +534,7 @@ static int es7000_cpu_to_logical_apicid(int cpu)
#ifdef CONFIG_SMP
if (cpu >= nr_cpu_ids)
return BAD_APICID;
return cpu_2_logical_apicid[cpu];
return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
#else
return logical_smp_processor_id();
#endif

2
arch/x86/kernel/apic/numaq_32.c
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@ -377,7 +377,7 @@ static inline int numaq_cpu_to_logical_apicid(int cpu)
{
if (cpu >= nr_cpu_ids)
return BAD_APICID;
return cpu_2_logical_apicid[cpu];
return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
}
/*

4
arch/x86/kernel/apic/summit_32.c
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@ -206,7 +206,7 @@ static void summit_init_apic_ldr(void)
/* Create logical APIC IDs by counting CPUs already in cluster. */
for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
lid = cpu_2_logical_apicid[i];
lid = early_per_cpu(x86_cpu_to_logical_apicid, i);
if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
++count;
}
@ -247,7 +247,7 @@ static inline int summit_cpu_to_logical_apicid(int cpu)
#ifdef CONFIG_SMP
if (cpu >= nr_cpu_ids)
return BAD_APICID;
return cpu_2_logical_apicid[cpu];
return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
#else
return logical_smp_processor_id();
#endif

7
arch/x86/kernel/setup_percpu.c
View File

@ -225,6 +225,10 @@ void __init setup_per_cpu_areas(void)
per_cpu(x86_bios_cpu_apicid, cpu) =
early_per_cpu_map(x86_bios_cpu_apicid, cpu);
#endif
#ifdef CONFIG_X86_32
per_cpu(x86_cpu_to_logical_apicid, cpu) =
early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
#endif
#ifdef CONFIG_X86_64
per_cpu(irq_stack_ptr, cpu) =
per_cpu(irq_stack_union.irq_stack, cpu) +
@ -256,6 +260,9 @@ void __init setup_per_cpu_areas(void)
early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
#endif
#ifdef CONFIG_X86_32
early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
#endif
#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif

7
arch/x86/kernel/smpboot.c
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@ -165,9 +165,6 @@ static void unmap_cpu_to_node(int cpu)
#endif
#ifdef CONFIG_X86_32
u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly =
{ [0 ... NR_CPUS-1] = BAD_APICID };
static void map_cpu_to_logical_apicid(void)
{
int cpu = smp_processor_id();
@ -177,13 +174,13 @@ static void map_cpu_to_logical_apicid(void)
if (!node_online(node))
node = first_online_node;
cpu_2_logical_apicid[cpu] = apicid;
early_per_cpu(x86_cpu_to_logical_apicid, cpu) = apicid;
map_cpu_to_node(cpu, node);
}
void numa_remove_cpu(int cpu)
{
cpu_2_logical_apicid[cpu] = BAD_APICID;
early_per_cpu(x86_cpu_to_logical_apicid, cpu) = BAD_APICID;
unmap_cpu_to_node(cpu);
}
#else