From: Shaohua Li <shli@kernel.org>
Date: Tue, 15 Oct 2013 01:05:03 +0000 (+0800)
Subject: percpu_ida: add an API to return free tags
X-Git-Tag: v3.13-rc1~101^2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0;p=pandora-kernel.git

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>
---

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