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cpuset: remove unneeded NODEMASK_ALLOC() in cpuset_sprintf_memlist()

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It's not necessary to copy cpuset->mems_allowed to a buffer allocated by
NODEMASK_ALLOC().  Just pass it to nodelist_scnprintf().

As spotted by Paul, a side effect is we fix a bug that the function can
return -ENOMEM but the caller doesn't expect negative return value.
Therefore change the return value of cpuset_sprintf_cpulist() and
cpuset_sprintf_memlist() from int to size_t.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2011-03-23 16:42:45 -07:00 committed by Linus Torvalds
parent f9434ad155
commit 9303e0c481
1 changed files with 8 additions and 16 deletions
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24
kernel/cpuset.c
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@ -1610,34 +1610,26 @@ static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft,
* across a page fault.
*/
static int cpuset_sprintf_cpulist(char *page, struct cpuset *cs)
static size_t cpuset_sprintf_cpulist(char *page, struct cpuset *cs)
{
int ret;
size_t count;
mutex_lock(&callback_mutex);
ret = cpulist_scnprintf(page, PAGE_SIZE, cs->cpus_allowed);
count = cpulist_scnprintf(page, PAGE_SIZE, cs->cpus_allowed);
mutex_unlock(&callback_mutex);
return ret;
return count;
}
static int cpuset_sprintf_memlist(char *page, struct cpuset *cs)
static size_t cpuset_sprintf_memlist(char *page, struct cpuset *cs)
{
NODEMASK_ALLOC(nodemask_t, mask, GFP_KERNEL);
int retval;
if (mask == NULL)
return -ENOMEM;
size_t count;
mutex_lock(&callback_mutex);
*mask = cs->mems_allowed;
count = nodelist_scnprintf(page, PAGE_SIZE, cs->mems_allowed);
mutex_unlock(&callback_mutex);
retval = nodelist_scnprintf(page, PAGE_SIZE, *mask);
NODEMASK_FREE(mask);
return retval;
return count;
}
static ssize_t cpuset_common_file_read(struct cgroup *cont,