linux-kernel - [tip:sched/core] sched: Remove cfs bandwidth period check in tg_set_cfs

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Date:	Wed, 21 Dec 2011 03:43:27 -0800
From:	tip-bot for Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	kamalesh@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	pjt@...gle.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched:
  Remove cfs bandwidth period check in tg_set_cfs_period()

Commit-ID:  11534ec5b6cea13ae38d31799d2a5290c5d724af
Gitweb:     http://git.kernel.org/tip/11534ec5b6cea13ae38d31799d2a5290c5d724af
Author:     Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
AuthorDate: Sat, 10 Dec 2011 19:29:25 +0530
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 21 Dec 2011 10:34:48 +0100

sched: Remove cfs bandwidth period check in tg_set_cfs_period()

Remove cfs bandwidth period check from tg_set_cfs_period.
Invalid bandwidth period's lower/upper limits are denoted
by min_cfs_quota_period/max_cfs_quota_period repsectively,
and are checked against valid period in tg_set_cfs_bandwidth().

As pjt pointed out, negative input will result in very large unsigned
numbers and will be caught by the max allowed period test.

Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Acked-by: Paul Turner <pjt@...gle.com>
[ammended changelog to mention negative values]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20111210135925.GA14593@linux.vnet.ibm.com
--
 kernel/sched/core.c |    3 ---
 1 file changed, 3 deletions(-)

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched/core.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index dba878c..081ece2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7714,9 +7714,6 @@ int tg_set_cfs_period(struct task_group *tg, long cfs_period_us)
 	period = (u64)cfs_period_us * NSEC_PER_USEC;
 	quota = tg->cfs_bandwidth.quota;
 
-	if (period <= 0)
-		return -EINVAL;
-
 	return tg_set_cfs_bandwidth(tg, period, quota);
 }
 
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