linux-kernel - [PATCH] cpumask: convert RCU implementations, fix

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Date:	Sat, 3 Jan 2009 13:19:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Travis <travis@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] cpumask: convert RCU implementations, fix


there's a build warning regression as well on CONFIG_RCU_CLASSIC:

 kernel/rcuclassic.c: In function ‘rcu_start_batch’:
 kernel/rcuclassic.c:397: warning: passing argument 1 of ‘cpumask_andnot’ from incompatible pointer type

caused by:

 bd232f9: cpumask: convert RCU implementations

fixed via the patch below. (i'll carry this in cpus4096 too, ok?)

	Ingo

---------------------->
>From 9caab32c0d69e569e33caa03845cec73ae701f32 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Sat, 3 Jan 2009 13:16:09 +0100
Subject: [PATCH] cpumask: convert RCU implementations, fix
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

Impact: cleanup

This warning:

 kernel/rcuclassic.c: In function ‘rcu_start_batch’:
 kernel/rcuclassic.c:397: warning: passing argument 1 of ‘cpumask_andnot’ from incompatible pointer type

triggers because one usage site of rcp->cpumask was not converted
to to_cpumask(rcp->cpumask). There's no ill effects of this bug.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/rcuclassic.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index 6ec495f..490934f 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -394,7 +394,8 @@ static void rcu_start_batch(struct rcu_ctrlblk *rcp)
 		 * unnecessarily.
 		 */
 		smp_mb();
-		cpumask_andnot(&rcp->cpumask, cpu_online_mask, nohz_cpu_mask);
+		cpumask_andnot(to_cpumask(rcp->cpumask),
+			       cpu_online_mask, nohz_cpu_mask);
 
 		rcp->signaled = 0;
 	}
--
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