From: Dennis Zhou <dennisszhou@gmail.com>
Date: Wed, 27 Sep 2017 21:34:59 +0000 (-0500)
Subject: percpu: fix starting offset for chunk statistics traversal
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2e08d20d777e997bf37806b22b471f98fbe6b693;p=linux.git

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@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c
index 6142484e88f79..7a58460bfd27a 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