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| author | Ingo Molnar <mingo@elte.hu> | 2008-01-22 11:24:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-22 11:24:58 +0100 |
| commit | c61935fd0e7f087a643827b4bf5ef646963c10fa (patch) | |
| tree | 4bfa925404acd5e5ecb6a3e597ab689415ac35e6 /kernel/sched.c | |
| parent | d384e35a25445bb60457b7dab8cffe178c6b7ecb (diff) | |
| download | linux-c61935fd0e7f087a643827b4bf5ef646963c10fa.tar.gz linux-c61935fd0e7f087a643827b4bf5ef646963c10fa.tar.bz2 linux-c61935fd0e7f087a643827b4bf5ef646963c10fa.zip | |
sched: group scheduler, set uid share fix
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>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 37cf07aa4164..e76b11ca6df3 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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; |