summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorShaohua Li <shli@kernel.org>2013-10-15 09:05:03 +0800
committerJens Axboe <axboe@kernel.dk>2013-10-25 11:56:00 +0100
commit1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0 (patch)
treec2812f72384ee2f4e0d90f65844bdd91a370e8c5 /include
parent7fc2ba17e8bf9f218cac10cc2a3de613d9d9086d (diff)
downloadlinux-stable-1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0.tar.gz
linux-stable-1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0.tar.bz2
linux-stable-1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0.zip
percpu_ida: add an API to return free tags
Add an API to return free tags, blk-mq-tag will use it. Note, this just returns a snapshot of free tags number. blk-mq-tag has two usages of it. One is for info output for diagnosis. The other is to quickly check if there are free tags for request dispatch checking. Neither requires very precise. Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/percpu_ida.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/percpu_ida.h b/include/linux/percpu_ida.h
index 63510ae6f933..1900bd0fa639 100644
--- a/include/linux/percpu_ida.h
+++ b/include/linux/percpu_ida.h
@@ -77,4 +77,5 @@ typedef int (*percpu_ida_cb)(unsigned, void *);
int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn,
void *data);
+unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu);
#endif /* __PERCPU_IDA_H__ */