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cpumask: smp_call_function_many()

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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
This commit is contained in:
Rusty Russell
2008-12-30 09:05:16 +10:30
parent 3fa4152069
commit 54b11e6d57
2 changed files with 56 additions and 96 deletions
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15
include/linux/smp.h
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@@ -67,15 +67,16 @@ extern void smp_cpus_done(unsigned int max_cpus);
* Call a function on all other processors
*/
int smp_call_function(void(*func)(void *info), void *info, int wait);
/* Deprecated: use smp_call_function_many() which uses a cpumask ptr. */
int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
int wait);
void smp_call_function_many(const struct cpumask *mask,
void (*func)(void *info), void *info, bool wait);
static inline void smp_call_function_many(const struct cpumask *mask,
void (*func)(void *info), void *info,
int wait)
/* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
static inline int
smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
int wait)
{
smp_call_function_mask(*mask, func, info, wait);
smp_call_function_many(&mask, func, info, wait);
return 0;
}
int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,