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[PATCH] sched: fix SCHED_FIFO bug in sys_sched_rr_get_interval() 

The introduction of SCHED_BATCH scheduling class with a value of 3 means
that the expression (p->policy & SCHED_FIFO) will return true if policy
is SCHED_BATCH or SCHED_FIFO.

Unfortunately, this expression is used in sys_sched_rr_get_interval()
and in the absence of a comment to say that this is intentional I
presume that it is unintentional and erroneous.

The fix is to change the expression to (p->policy == SCHED_FIFO).

Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Williams 2006-06-26 16:58:00 +10:00 committed by Linus Torvalds
parent 2139a7fbf3
commit b78709cfd4
1 changed files with 1 additions and 1 deletions
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2
kernel/sched.c
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@ -4247,7 +4247,7 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
if (retval)
goto out_unlock;
jiffies_to_timespec(p->policy & SCHED_FIFO ?
jiffies_to_timespec(p->policy == SCHED_FIFO ?
0 : task_timeslice(p), &t);
read_unlock(&tasklist_lock);
retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;