diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2011-03-24 02:42:45 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-24 05:46:34 +0300 |
| commit | 9303e0c4814d2a6afca878cc35433291e862169c (patch) | |
| tree | 786866f6f0639edcc2996d4157ea7128b2400898 | |
| parent | f9434ad1552427fab49336e1a6e3ef121895b9d1 (diff) | |
| download | linux-9303e0c4814d2a6afca878cc35433291e862169c.tar.xz | |
cpuset: remove unneeded NODEMASK_ALLOC() in cpuset_sprintf_memlist()
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>
| -rw-r--r-- | kernel/cpuset.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index e92e98189032..4683fe728c9b 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1610,34 +1610,26 @@ out: * 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, |