From: Omar Sandoval <osandov@fb.com>
Date: Thu, 10 May 2018 00:29:24 +0000 (-0700)
Subject: sbitmap: warn if using smaller shallow depth than was setup
X-Git-Tag: v4.18-rc1~192^2~124
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=61445b56d031bc12feafb477848cf4ef9a725fc9;p=nvme.git

sbitmap: warn if using smaller shallow depth than was setup

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>
---

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)) {