linux-kernel - [tip:sched/core] sched: Fix up attr::sched

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Message-ID: <tip-fid9nalzii2r5voxtf4eh5kz@git.kernel.org>
Date:	Thu, 16 Jan 2014 05:40:40 -0800
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, raistlin@...ux.it, tglx@...utronix.de,
	fengguang.wu@...el.com, juri.lelli@...il.com
Subject: [tip:sched/core] sched: Fix up attr::sched_priority warning

Commit-ID:  0bb040a44381261c0729636abbe03caeedb7d72e
Gitweb:     http://git.kernel.org/tip/0bb040a44381261c0729636abbe03caeedb7d72e
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 15 Jan 2014 17:15:13 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 16 Jan 2014 09:27:16 +0100

sched: Fix up attr::sched_priority warning

Fengguang Wu reported the following build warning:

  > kernel/sched/core.c:3067 __sched_setscheduler() warn: unsigned 'attr->sched_priority' is never less than zero.

Since it doesn't make sense for attr::sched_priority to be negative,
remove the check, since we already test for an upper limit any actual
negative values passed in through the old param::sched_priority field
will still be detected.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...il.com>
Cc: Dario Faggioli <raistlin@...ux.it>
Fixes: d50dde5a10f3 ("sched: Add new scheduler syscalls to support an extended scheduling parameters ABI")
Link: http://lkml.kernel.org/n/tip-fid9nalzii2r5voxtf4eh5kz@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e9212eb..5a6ccdf 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3282,8 +3282,7 @@ recheck:
 	 * 1..MAX_USER_RT_PRIO-1, valid priority for SCHED_NORMAL,
 	 * SCHED_BATCH and SCHED_IDLE is 0.
 	 */
-	if (attr->sched_priority < 0 ||
-	    (p->mm && attr->sched_priority > MAX_USER_RT_PRIO-1) ||
+	if ((p->mm && attr->sched_priority > MAX_USER_RT_PRIO-1) ||
 	    (!p->mm && attr->sched_priority > MAX_RT_PRIO-1))
 		return -EINVAL;
 	if ((dl_policy(policy) && !__checkparam_dl(attr)) ||
--
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