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cpuset: remove on stack cpumask_t in cpuset_sprintf_cpulist()

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This patchset converts cpuset to use new cpumask API, and thus
remove on stack cpumask_t to reduce stack usage.

Before:
 # cat kernel/cpuset.c include/linux/cpuset.h | grep -c cpumask_t
 21
After:
 # cat kernel/cpuset.c include/linux/cpuset.h | grep -c cpumask_t
 0

This patch:

Impact: reduce stack usage

It's safe to call cpulist_scnprintf inside callback_mutex, and thus we can
just remove the cpumask_t and no need to allocate a cpumask_var_t.

Signed-off-by: Li Zefan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Rusty Russell <[email protected]>
Acked-by: Mike Travis <[email protected]>
Cc: Paul Menage <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Li Zefan 2009-01-07 18:08:41 -08:00 • committed by Linus Torvalds
commit 5a7625df72
1 changed files with 3 additions and 3 deletions
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6
kernel/cpuset.c
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@ -1486,13 +1486,13 @@ static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft,
static int cpuset_sprintf_cpulist(char *page, struct cpuset *cs)
{
cpumask_t mask;
int ret;
mutex_lock(&callback_mutex);
mask = cs->cpus_allowed;
ret = cpulist_scnprintf(page, PAGE_SIZE, &cs->cpus_allowed);
mutex_unlock(&callback_mutex);
return cpulist_scnprintf(page, PAGE_SIZE, &mask);
return ret;
}
static int cpuset_sprintf_memlist(char *page, struct cpuset *cs)