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sched: Fix string comparison in /proc/sched_features 

Fix incorrect handling of the following case:

 INTERACTIVE
 INTERACTIVE_SOMETHING_ELSE

The comparison only checks up to each element's length.

Changelog since v1:
 - Embellish using some Rostedtisms.
  [ mingo:                 ^^ == smaller and cleaner ]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: <stable@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tony Lindgren <tony@atomide.com>
LKML-Reference: <20100913214700.GB16118@Krystal>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mathieu Desnoyers 2010-09-13 17:47:00 -04:00 committed by Ingo Molnar
parent 637bbdc5b8
commit 7740191cd9
1 changed files with 3 additions and 4 deletions
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7
kernel/sched.c
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@ -721,7 +721,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char buf[64];
char *cmp = buf;
char *cmp;
int neg = 0;
int i;
@ -732,6 +732,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
return -EFAULT;
buf[cnt] = 0;
cmp = strstrip(buf);
if (strncmp(buf, "NO_", 3) == 0) {
neg = 1;
@ -739,9 +740,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
}
for (i = 0; sched_feat_names[i]; i++) {
int len = strlen(sched_feat_names[i]);
if (strncmp(cmp, sched_feat_names[i], len) == 0) {
if (strcmp(cmp, sched_feat_names[i]) == 0) {
if (neg)
sysctl_sched_features &= ~(1UL << i);
else