From: Tejun Heo <tj@kernel.org>
Date: Sun, 1 Mar 2009 06:42:36 +0000 (+0900)
Subject: percpu: kill compile warning in pcpu_populate_chunk()
X-Git-Tag: firefly_0821_release~13991^2~247^2~13
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=02d51fdfb2bfcf6bbd776f983177f55868aa0a79;p=firefly-linux-kernel-4.4.55.git

percpu: kill compile warning in pcpu_populate_chunk()

Impact: remove compile warning

Mark local variable map_end in pcpu_populate_chunk() with
uninitialized_var().  The variable is always used in tandem with
map_start and guaranteed to be initialized before use but gcc doesn't
understand that.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/mm/percpu.c b/mm/percpu.c
index 5954e7a9eb1e..3d0f5456827c 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -639,7 +639,7 @@ static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
 	int page_start = PFN_DOWN(off);
 	int page_end = PFN_UP(off + size);
 	int map_start = -1;
-	int map_end;
+	int uninitialized_var(map_end);
 	unsigned int cpu;
 	int i;