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kernel/smp.c: remove cpumask_ipi 

After commit 9a46ad6d6d ("smp: make smp_call_function_many() use logic
similar to smp_call_function_single()"), cfd->cpumask is accessed only
in smp_call_function_many().  So there is no more need to copy it into
cfd->cpumask_ipi before putting csd into the list.  The cpumask_ipi
field is obsolete and can be removed.

Signed-off-by: Roman Gushchin <klamm@yandex-team.ru>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Wang YanQing <udknight@gmail.com>
Cc: Xie XiuQi <xiexiuqi@huawei.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2014-01-30 15:45:48 -08:00 committed by Linus Torvalds
parent 6897fc22ea
commit 73f945505b
1 changed files with 1 additions and 16 deletions
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17
kernel/smp.c
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@ -23,7 +23,6 @@ enum {
struct call_function_data {
struct call_single_data __percpu *csd;
cpumask_var_t cpumask;
cpumask_var_t cpumask_ipi;
};
static DEFINE_PER_CPU_SHARED_ALIGNED(struct call_function_data, cfd_data);
@ -42,14 +41,8 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
cpu_to_node(cpu)))
return notifier_from_errno(-ENOMEM);
if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi, GFP_KERNEL,
cpu_to_node(cpu))) {
free_cpumask_var(cfd->cpumask);
return notifier_from_errno(-ENOMEM);
}
cfd->csd = alloc_percpu(struct call_single_data);
if (!cfd->csd) {
free_cpumask_var(cfd->cpumask_ipi);
free_cpumask_var(cfd->cpumask);
return notifier_from_errno(-ENOMEM);
}
@ -62,7 +55,6 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
case CPU_DEAD:
case CPU_DEAD_FROZEN:
free_cpumask_var(cfd->cpumask);
free_cpumask_var(cfd->cpumask_ipi);
free_percpu(cfd->csd);
break;
#endif
@ -383,13 +375,6 @@ void smp_call_function_many(const struct cpumask *mask,
if (unlikely(!cpumask_weight(cfd->cpumask)))
return;
/*
* After we put an entry into the list, cfd->cpumask may be cleared
* again when another CPU sends another IPI for a SMP function call, so
* cfd->cpumask will be zero.
*/
cpumask_copy(cfd->cpumask_ipi, cfd->cpumask);
for_each_cpu(cpu, cfd->cpumask) {
struct call_single_data *csd = per_cpu_ptr(cfd->csd, cpu);
@ -400,7 +385,7 @@ void smp_call_function_many(const struct cpumask *mask,
}
/* Send a message to all CPUs in the map */
arch_send_call_function_ipi_mask(cfd->cpumask_ipi);
arch_send_call_function_ipi_mask(cfd->cpumask);
if (wait) {
for_each_cpu(cpu, cfd->cpumask) {