linux-kernel - [PATCH BUGFIX 1/1] block, bfq: compile group put for oom queue only if BFQ_GROUP

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Date:   Wed, 10 Jan 2018 15:58:56 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, broonie@...nel.org,
        linus.walleij@...aro.org, bfq-iosched@...glegroups.com,
        oleksandr@...alenko.name, Paolo Valente <paolo.valente@...aro.org>
Subject: [PATCH BUGFIX 1/1] block, bfq: compile group put for oom queue only if BFQ_GROUP_IOSCHED is set

Commit ("block, bfq: release oom-queue ref to root group on exit")
added a missing put of the root bfq group for the oom queue. That put
has to be, and can be, performed only if CONFIG_BFQ_GROUP_IOSCHED is
defined: the function doing the put is even not defined at all if
CONFIG_BFQ_GROUP_IOSCHED is not defined. But that commit makes that
put be invoked regardless of whether CONFIG_BFQ_GROUP_IOSCHED is
defined. This commit fixes this mistake, by making that invocation be
compiled only if CONFIG_BFQ_GROUP_IOSCHED is actually defined.

Fixes ("block, bfq: release oom-queue ref to root group on exit")
Reported-by: Jan Alexander Steffens <jan.steffens@...il.com>
Signed-off-by: Paolo Valente <paolo.valente@...aro.org>
---
 block/bfq-iosched.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index c56a495af2e8..93a97a7fe519 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -5015,10 +5015,9 @@ static void bfq_exit_queue(struct elevator_queue *e)
 
 	hrtimer_cancel(&bfqd->idle_slice_timer);
 
+#ifdef CONFIG_BFQ_GROUP_IOSCHED
 	/* release oom-queue reference to root group */
 	bfqg_and_blkg_put(bfqd->root_group);
-
-#ifdef CONFIG_BFQ_GROUP_IOSCHED
 	blkcg_deactivate_policy(bfqd->queue, &blkcg_policy_bfq);
 #else
 	spin_lock_irq(&bfqd->lock);
-- 
2.15.1