linux-kernel - [tip:sched/urgent] sched/preempt/x86: Fix voluntary preempt for x86

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Date:	Thu, 23 Jan 2014 08:46:34 -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, paulmck@...ux.vnet.ibm.com,
	markus@...ppelsdorf.de, dipankar@...ibm.com, tglx@...utronix.de
Subject: [tip:sched/urgent] sched/preempt/x86:
  Fix voluntary preempt for x86

Commit-ID:  215393bc1fab3d61a5a296838bdffce22f27ffda
Gitweb:     http://git.kernel.org/tip/215393bc1fab3d61a5a296838bdffce22f27ffda
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 22 Jan 2014 11:24:35 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 23 Jan 2014 14:48:35 +0100

sched/preempt/x86: Fix voluntary preempt for x86

The #ifdef CONFIG_PREEMPT is both not needed and wrong.

Its not required because asm/preempt.h should provide
{set,clear}_preempt_need_resched() regardless and its wrong because
for voluntary preempt we still rely on PREEMPT_NEED_RESCHED.

Reported-and-Tested-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Fixes: 8cb75e0c4ec9 ("sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding")
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Dipankar Sarma <dipankar@...ibm.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20140122102435.GH31570@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/preempt.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 59749fc..de83b4e 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -134,7 +134,6 @@ do { \
 #undef preempt_check_resched
 #endif
 
-#ifdef CONFIG_PREEMPT
 #define preempt_set_need_resched() \
 do { \
 	set_preempt_need_resched(); \
@@ -144,10 +143,6 @@ do { \
 	if (tif_need_resched()) \
 		set_preempt_need_resched(); \
 } while (0)
-#else
-#define preempt_set_need_resched() do { } while (0)
-#define preempt_fold_need_resched() do { } while (0)
-#endif
 
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
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