From: Omar Sandoval <osandov@fb.com>
Date: Wed, 9 May 2018 17:29:24 -0700
Subject: [PATCH] sbitmap: warn if using smaller shallow depth than was setup
Git-commit: 61445b56d031bc12feafb477848cf4ef9a725fc9
Patch-mainline: v4.18-rc1
References: bsc#1104967,FATE#325924
Make sure the user passed the right value to
sbitmap_queue_min_shallow_depth().
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
lib/sbitmap.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index d21473b42465..8f0950fbaa5c 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -402,6 +402,8 @@ int __sbitmap_queue_get_shallow(struct sbitmap_queue *sbq,
unsigned int hint, depth;
int nr;
+ WARN_ON_ONCE(shallow_depth < sbq->min_shallow_depth);
+
hint = this_cpu_read(*sbq->alloc_hint);
depth = READ_ONCE(sbq->sb.depth);
if (unlikely(hint >= depth)) {
--
2.16.4