linux-kernel - [PATCH percpu#for-next] percpu: clear memory allocated with the km allocator

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Message-ID: <4C89F1CE.4050302@gmail.com>
Date:	Fri, 10 Sep 2010 10:52:30 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Stephane Eranian <eranian@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	robert.richter@....com, acme@...hat.com
Subject: [PATCH percpu#for-next] percpu: clear memory allocated with the km
 allocator

Percpu allocator should clear memory before returning it but the km
allocator forgot to do it.  Fix it.

Signed-off-by: Tejun Heo <tj@...nel.org>
Spotted-by: Peter Zijlstra <peterz@...radead.org>
---
 mm/percpu-km.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index 7037bc7..89633fe 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -35,7 +35,11 @@

 static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
 {
-	/* noop */
+	unsigned int cpu;
+
+	for_each_possible_cpu(cpu)
+		memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
+
 	return 0;
 }

-- 
1.7.1

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