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sbitmap: warn if using smaller shallow depth than was setup
author
Omar Sandoval
<osandov@fb.com>
Thu, 10 May 2018 00:29:24 +0000
(17:29 -0700)
committer
Jens Axboe
<axboe@kernel.dk>
Thu, 10 May 2018 17:27:52 +0000
(11:27 -0600)
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>
lib/sbitmap.c
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diff --git
a/lib/sbitmap.c
b/lib/sbitmap.c
index d21473b42465c4a87934564706035d1603f3e88f..8f0950fbaa5c60c402cd1565cfed4cdf71847390 100644
(file)
--- 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)) {