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authorRusty Russell <rusty@rustcorp.com.au>2008-12-29 17:35:16 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-12-29 17:35:16 -0500
commit54b11e6d57a10aa9d0009efd93873e17bffd5d30 (patch)
treeac09296e7b0726aa6143913526f8983fae1cb497 /include/linux/smp.h
parent3fa41520696fec2815e2d88fbcccdda77ba4d693 (diff)
cpumask: smp_call_function_many()
Impact: Implementation change to remove cpumask_t from stack. Actually change smp_call_function_mask() to smp_call_function_many(). We avoid cpumasks on the stack in this version. (S390 has its own version, but that's going away apparently). We have to do some dancing to figure out if 0 or 1 other cpus are in the mask supplied and the online mask without allocating a tmp cpumask. It's still fairly cheap. We allocate the cpumask at the end of the call_function_data structure: if allocation fails we fallback to smp_call_function_single rather than using the baroque quiescing code (which needs a cpumask on stack). (Thanks to Hiroshi Shimamoto for spotting several bugs in previous versions!) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Cc: npiggin@suse.de Cc: axboe@kernel.dk
Diffstat (limited to 'include/linux/smp.h')
-rw-r--r--include/linux/smp.h15
1 files changed, 8 insertions, 7 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 2f85f3b04bc4..b82466968101 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -67,15 +67,16 @@ extern void smp_cpus_done(unsigned int max_cpus);
67 * Call a function on all other processors 67 * Call a function on all other processors
68 */ 68 */
69int smp_call_function(void(*func)(void *info), void *info, int wait); 69int smp_call_function(void(*func)(void *info), void *info, int wait);
70/* Deprecated: use smp_call_function_many() which uses a cpumask ptr. */ 70void smp_call_function_many(const struct cpumask *mask,
71int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info, 71 void (*func)(void *info), void *info, bool wait);
72 int wait);
73 72
74static inline void smp_call_function_many(const struct cpumask *mask, 73/* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
75 void (*func)(void *info), void *info, 74static inline int
76 int wait) 75smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
76 int wait)
77{ 77{
78 smp_call_function_mask(*mask, func, info, wait); 78 smp_call_function_many(&mask, func, info, wait);
79 return 0;
79} 80}
80 81
81int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 82int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,