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sched: group scheduler, set uid share fix

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setting cpu share to 1 causes hangs, as reported in:

    http://bugzilla.kernel.org/show_bug.cgi?id=9779

as the default share is 1024, the values of 0 and 1 can indeed
cause problems. Limit it to 2 or higher values.

These values can only be set by the root user - but still it
makes sense to protect against nonsensical values.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-01-22 11:24:58 +01:00
parent d384e35a25
commit c61935fd0e
1 changed files with 8 additions and 0 deletions
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8
kernel/sched.c
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@ -7153,6 +7153,14 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
{
int i;
/*
* A weight of 0 or 1 can cause arithmetics problems.
* (The default weight is 1024 - so there's no practical
* limitation from this.)
*/
if (shares < 2)
shares = 2;
spin_lock(&tg->lock);
if (tg->shares == shares)
goto done;