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s390: enforce CONFIG_SMP

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There never have been distributions that shiped with CONFIG_SMP=n for
s390. In addition the kernel currently doesn't even compile with
CONFIG_SMP=n for s390. Most likely it wouldn't even work, even if we
fix the compile error, since nobody tests it, since there is no use
case that I can think of.
Therefore simply enforce CONFIG_SMP and get rid of some more or
less unused code.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2019-06-03 14:25:18 +02:00
parent 753469a23b
commit 67626fadd2
12 changed files with 7 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/s390/Kconfig
View File

@ -30,7 +30,7 @@ config GENERIC_BUG_RELATIVE_POINTERS
def_bool y
config GENERIC_LOCKBREAK
def_bool y if SMP && PREEMPT
def_bool y if PREEMPT
config PGSTE
def_bool y if KVM
@ -113,7 +113,6 @@ config S390
select DYNAMIC_FTRACE if FUNCTION_TRACER
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_AUTOPROBE
select GENERIC_CPU_DEVICES if !SMP
select GENERIC_CPU_VULNERABILITIES
select GENERIC_FIND_FIRST_BIT
select GENERIC_SMP_IDLE_THREAD
@ -399,27 +398,10 @@ config SYSVIPC_COMPAT
config SMP
def_bool y
prompt "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
you have a system with more than one CPU, say Y.
If you say N here, the kernel will run on uni- and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on many, but not all,
uniprocessor machines. On a uniprocessor machine, the kernel
will run faster if you say N here.
See also the SMP-HOWTO available at
<http://www.tldp.org/docs.html#howto>.
Even if you don't know what to do here, say Y.
config NR_CPUS
int "Maximum number of CPUs (2-512)"
range 2 512
depends on SMP
default "64"
help
This allows you to specify the maximum number of CPUs which this
@ -432,7 +414,6 @@ config NR_CPUS
config HOTPLUG_CPU
def_bool y
prompt "Support for hot-pluggable CPUs"
depends on SMP
help
Say Y here to be able to turn CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu/cpu#.
@ -448,7 +429,7 @@ config NODES_SPAN_OTHER_NODES
config NUMA
bool "NUMA support"
depends on SMP && SCHED_TOPOLOGY
depends on SCHED_TOPOLOGY
default n
help
Enable NUMA support
@ -523,7 +504,6 @@ config SCHED_DRAWER
config SCHED_TOPOLOGY
def_bool y
prompt "Topology scheduler support"
depends on SMP
select SCHED_SMT
select SCHED_MC
select SCHED_BOOK
@ -829,7 +809,6 @@ menu "Dump support"
config CRASH_DUMP
bool "kernel crash dumps"
depends on SMP
select KEXEC
help
Generate crash dump after being started by kexec.

9
arch/s390/include/asm/ctl_reg.h
View File

@ -112,13 +112,8 @@ union ctlreg2 {
};
};
#ifdef CONFIG_SMP
# define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
# define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
#else
# define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
# define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
#endif
#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
#endif /* __ASSEMBLY__ */
#endif /* __ASM_CTL_REG_H */

2
arch/s390/include/asm/percpu.h
View File

@ -16,7 +16,7 @@
* per cpu area, use weak definitions to force the compiler to
* generate external references.
*/
#if defined(CONFIG_SMP) && defined(MODULE)
#if defined(MODULE)
#define ARCH_NEEDS_WEAK_PER_CPU
#endif

30
arch/s390/include/asm/smp.h
View File

@ -9,9 +9,6 @@
#define __ASM_SMP_H
#include <asm/sigp.h>
#ifdef CONFIG_SMP
#include <asm/lowcore.h>
#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
@ -40,33 +37,6 @@ extern int smp_cpu_get_polarization(int cpu);
extern void smp_fill_possible_mask(void);
extern void smp_detect_cpus(void);
#else /* CONFIG_SMP */
#define smp_cpu_mtid 0
static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
{
func(data);
}
static inline void smp_call_online_cpu(void (*func)(void *), void *data)
{
func(data);
}
static inline void smp_emergency_stop(void)
{
}
static inline int smp_find_processor_id(u16 address) { return 0; }
static inline int smp_store_status(int cpu) { return 0; }
static inline int smp_vcpu_scheduled(int cpu) { return 1; }
static inline void smp_yield_cpu(int cpu) { }
static inline void smp_fill_possible_mask(void) { }
static inline void smp_detect_cpus(void) { }
#endif /* CONFIG_SMP */
static inline void smp_stop_cpu(void)
{
u16 pcpu = stap();

4
arch/s390/include/asm/spinlock.h
View File

@ -20,11 +20,7 @@
extern int spin_retry;
#ifndef CONFIG_SMP
static inline bool arch_vcpu_is_preempted(int cpu) { return false; }
#else
bool arch_vcpu_is_preempted(int cpu);
#endif
#define vcpu_is_preempted arch_vcpu_is_preempted

17
arch/s390/include/asm/tlbflush.h
View File

@ -32,7 +32,6 @@ static inline void __tlb_flush_idte(unsigned long asce)
: : "a" (opt), "a" (asce) : "cc");
}
#ifdef CONFIG_SMP
void smp_ptlb_all(void);
/*
@ -83,22 +82,6 @@ static inline void __tlb_flush_kernel(void)
else
__tlb_flush_global();
}
#else
#define __tlb_flush_global() __tlb_flush_local()
/*
* Flush TLB entries for a specific ASCE on all CPUs.
*/
static inline void __tlb_flush_mm(struct mm_struct *mm)
{
__tlb_flush_local();
}
static inline void __tlb_flush_kernel(void)
{
__tlb_flush_local();
}
#endif
static inline void __tlb_flush_mm_lazy(struct mm_struct * mm)
{

2
arch/s390/kernel/Makefile
View File

@ -53,6 +53,7 @@ obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o pgm_check.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
obj-y += smp.o
extra-y += head64.o vmlinux.lds
@ -60,7 +61,6 @@ obj-$(CONFIG_SYSFS) += nospec-sysfs.o
CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o
obj-$(CONFIG_HIBERNATION) += suspend.o swsusp.o
obj-$(CONFIG_AUDIT) += audit.o

2
arch/s390/kernel/dumpstack.c
View File

@ -199,9 +199,7 @@ void die(struct pt_regs *regs, const char *str)
#ifdef CONFIG_PREEMPT
pr_cont("PREEMPT ");
#endif
#ifdef CONFIG_SMP
pr_cont("SMP ");
#endif
if (debug_pagealloc_enabled())
pr_cont("DEBUG_PAGEALLOC");
pr_cont("\n");

4
arch/s390/kernel/entry.S
View File

@ -986,14 +986,12 @@ ENTRY(psw_idle)
stg %r3,__SF_EMPTY(%r15)
larl %r1,.Lpsw_idle_lpsw+4
stg %r1,__SF_EMPTY+8(%r15)
#ifdef CONFIG_SMP
larl %r1,smp_cpu_mtid
llgf %r1,0(%r1)
ltgr %r1,%r1
jz .Lpsw_idle_stcctm
.insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15)
.Lpsw_idle_stcctm:
#endif
oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
BPON
STCK __CLOCK_IDLE_ENTER(%r2)
@ -1468,7 +1466,6 @@ ENDPROC(cleanup_critical)
mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
1: # calculate idle cycles
#ifdef CONFIG_SMP
clg %r9,BASED(.Lcleanup_idle_insn)
jl 3f
larl %r1,smp_cpu_mtid
@ -1486,7 +1483,6 @@ ENDPROC(cleanup_critical)
la %r3,8(%r3)
la %r4,8(%r4)
brct %r1,2b
#endif
3: # account system time going idle
lg %r9,__LC_STEAL_TIMER
alg %r9,__CLOCK_IDLE_ENTER(%r2)

2
arch/s390/kernel/setup.c
View File

@ -461,11 +461,9 @@ static void __init setup_lowcore_dat_off(void)
mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
#ifdef CONFIG_SMP
lc->spinlock_lockval = arch_spin_lockval(0);
lc->spinlock_index = 0;
arch_spin_lock_setup(0);
#endif
lc->br_r1_trampoline = 0x07f1; /* br %r1 */
set_prefix((u32)(unsigned long) lc);

2
arch/s390/kernel/swsusp.S
View File

@ -162,7 +162,6 @@ ENTRY(swsusp_arch_resume)
larl %r1,__swsusp_reset_dma
lg %r1,0(%r1)
BASR_EX %r14,%r1
#ifdef CONFIG_SMP
larl %r1,smp_cpu_mt_shift
icm %r1,15,0(%r1)
jz smt_done
@ -172,7 +171,6 @@ smt_loop:
brc 8,smt_done /* accepted */
brc 2,smt_loop /* busy, try again */
smt_done:
#endif
larl %r1,.Lnew_pgm_check_psw
lpswe 0(%r1)
pgm_check_entry:

3
arch/s390/lib/Makefile
View File

@ -3,9 +3,8 @@
# Makefile for s390-specific library files..
#
lib-y += delay.o string.o uaccess.o find.o
lib-y += delay.o string.o uaccess.o find.o spinlock.o
obj-y += mem.o xor.o
lib-$(CONFIG_SMP) += spinlock.o
lib-$(CONFIG_KPROBES) += probes.o
lib-$(CONFIG_UPROBES) += probes.o