linux-kernel - [tip:timers/urgent] tick: Use zalloc_cpumask

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Date:	Sun, 5 May 2013 02:17:16 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, davej@...hat.com, tglx@...utronix.de
Subject: [tip:timers/urgent] tick:
  Use zalloc_cpumask_var for allocating offstack cpumasks

Commit-ID:  fbd44a607a1a5019bc32c3615cead8c5ee8f89c9
Gitweb:     http://git.kernel.org/tip/fbd44a607a1a5019bc32c3615cead8c5ee8f89c9
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 3 May 2013 20:22:36 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 5 May 2013 11:12:19 +0200

tick: Use zalloc_cpumask_var for allocating offstack cpumasks

commit b352bc1cbc (tick: Convert broadcast cpu bitmaps to
cpumask_var_t) broke CONFIG_CPUMASK_OFFSTACK in a very subtle way.

Instead of allocating the cpumasks with zalloc_cpumask_var it uses
alloc_cpumask_var, so we can get random data there, which of course
confuses the logic completely and causes random failures.

Reported-and-tested-by: Dave Jones <davej@...hat.com>
Reported-and-tested-by: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1305032015060.2990@ionos
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/time/tick-broadcast.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 61d00a8..d70cdc4 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -785,11 +785,11 @@ bool tick_broadcast_oneshot_available(void)
 
 void __init tick_broadcast_init(void)
 {
-	alloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
-	alloc_cpumask_var(&tmpmask, GFP_NOWAIT);
+	zalloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&tmpmask, GFP_NOWAIT);
 #ifdef CONFIG_TICK_ONESHOT
-	alloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
-	alloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
-	alloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
 #endif
 }
--
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