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cpumask: add CPU_MASK_ALL_PTR macro

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* Add a static cpumask_t variable "CPU_MASK_ALL_PTR" to use as
    a pointer reference to CPU_MASK_ALL.  This reduces where possible
    the instances where CPU_MASK_ALL allocates and fills a large
    array on the stack.  Used only if NR_CPUS > BITS_PER_LONG.

  * Change init/main.c to use new set_cpus_allowed_ptr().

Depends on:
	[sched-devel]: sched: add new set_cpus_allowed_ptr function

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis 2008-04-04 18:11:02 -07:00 committed by Ingo Molnar
parent 7c16ec585c
commit 321a8e9dcb
2 changed files with 12 additions and 1 deletions
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6
include/linux/cpumask.h
View file

@ -243,6 +243,8 @@ int __next_cpu(int n, const cpumask_t *srcp);
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
} }
#define CPU_MASK_ALL_PTR (&CPU_MASK_ALL)
#else
#define CPU_MASK_ALL \
@ -251,6 +253,10 @@ int __next_cpu(int n, const cpumask_t *srcp);
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
} }
/* cpu_mask_all is in init/main.c */
extern cpumask_t cpu_mask_all;
#define CPU_MASK_ALL_PTR (&cpu_mask_all)
#endif
#define CPU_MASK_NONE \

7
init/main.c
View file

@ -363,6 +363,11 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
#else
#if NR_CPUS > BITS_PER_LONG
cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL;
EXPORT_SYMBOL(cpu_mask_all);
#endif
#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
@ -811,7 +816,7 @@ static int __init kernel_init(void * unused)
/*
* init can run on any cpu.
*/
set_cpus_allowed(current, CPU_MASK_ALL);
set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
/*
* Tell the world that we're going to be the grim
* reaper of innocent orphaned children.