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generic-ipi: Add smp_call_function_any()

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Andrew points out that acpi-cpufreq uses cpumask_any, when it really
would prefer to use the same CPU if possible (to avoid an IPI).  In
general, this seems a good idea to offer.

[ tglx: Documented selection preference and Inlined the UP case to
  	avoid the copy of smp_call_function_single() and the extra
  	EXPORT ]

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Zhao Yakui <yakui.zhao@intel.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Rusty Russell 2009-11-17 14:27:27 -08:00 • committed by Thomas Gleixner
parent 72f279b256
commit 2ea6dec4a2
2 changed files with 55 additions and 1 deletions
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11
include/linux/smp.h
View file

@ -76,6 +76,9 @@ void smp_call_function_many(const struct cpumask *mask,
void __smp_call_function_single(int cpuid, struct call_single_data *data,
int wait);
int smp_call_function_any(const struct cpumask *mask,
void (*func)(void *info), void *info, int wait);
/*
* Generic and arch helpers
*/
@ -137,9 +140,15 @@ static inline void smp_send_reschedule(int cpu) { }
#define smp_prepare_boot_cpu() do {} while (0)
#define smp_call_function_many(mask, func, info, wait) \
(up_smp_call_function(func, info))
static inline void init_call_single_data(void)
static inline void init_call_single_data(void) { }
static inline int
smp_call_function_any(const struct cpumask *mask, void (*func)(void *info),
void *info, int wait)
{
return smp_call_function_single(0, func, info, wait);
}
#endif /* !SMP */
/*