linux-kernel - [PATCH 1/2] percpu: fix starting offset for chunk statistics traversal

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Message-Id: <1506548100-31247-2-git-send-email-dennisszhou@gmail.com>
Date:   Wed, 27 Sep 2017 16:34:59 -0500
From:   Dennis Zhou <dennisszhou@...il.com>
To:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Luis Henriques <lhenriques@...e.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Dennis Zhou <dennisszhou@...il.com>
Subject: [PATCH 1/2] percpu: fix starting offset for chunk statistics traversal

This patch fixes the starting offset used when scanning chunks to
compute the chunk statistics. The value start_offset (and end_offset)
are managed in bytes while the traversal occurs over bits. Thus for the
reserved and dynamic chunk, it may incorrectly skip over the initial
allocations.

Signed-off-by: Dennis Zhou <dennisszhou@...il.com>
---
 mm/percpu-stats.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c
index 6142484..7a58460 100644
--- a/mm/percpu-stats.c
+++ b/mm/percpu-stats.c
@@ -73,7 +73,7 @@ static void chunk_map_stats(struct seq_file *m, struct pcpu_chunk *chunk,
 		     last_alloc + 1 : 0;
 
 	as_len = 0;
-	start = chunk->start_offset;
+	start = chunk->start_offset / PCPU_MIN_ALLOC_SIZE;
 
 	/*
 	 * If a bit is set in the allocation map, the bound_map identifies
-- 
1.8.3.1