Messages in this thread Patch in this message |  | | | Date | Fri, 04 Apr 2008 18:11:02 -0700 | | From | Mike Travis <> | | Subject | [PATCH 02/12] 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
Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + x86/latest .../x86/linux-2.6-x86.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git
# x86 Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Mike Travis <travis@sgi.com> --- include/linux/cpumask.h | 6 ++++++ init/main.c | 7 ++++++- 2 files changed, 12 insertions(+), 1 deletion(-) --- linux-2.6.x86.orig/include/linux/cpumask.h +++ linux-2.6.x86/include/linux/cpumask.h @@ -249,6 +249,8 @@ extern cpumask_t *cpumask_of_cpu_map; [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ } } +#define CPU_MASK_ALL_PTR (&CPU_MASK_ALL) + #else #define CPU_MASK_ALL \ @@ -257,6 +259,10 @@ extern cpumask_t *cpumask_of_cpu_map; [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 \ --- linux-2.6.x86.orig/init/main.c +++ linux-2.6.x86/init/main.c @@ -366,6 +366,11 @@ static inline void smp_prepare_cpus(unsi #else +#if NR_CPUS > BITS_PER_LONG +cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL; +EXPORT_SYMBOL(cpu_mask_all); +#endif + /* Setup number of possible processor ids */ int nr_cpu_ids __read_mostly = NR_CPUS; EXPORT_SYMBOL(nr_cpu_ids); @@ -837,7 +842,7 @@ static int __init kernel_init(void * unu /* * 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. --
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