cpumask: add CPU_MASK_ALL_PTR macro

  * 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>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 67e0e38d32b1..629102feaa66 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -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                                                   \