Commit c61935fd authored Jan 22, 2008 by Ingo Molnar

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>

parent d384e35a

kernel/sched.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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;