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Date:   Fri, 31 Aug 2018 12:01:38 -0700 (PDT)
From:   Julia Lawall <>
cc:     Jens Axboe <>, Tejun Heo <>,
        Johannes Weiner <>,
        Josef Bacik <>,,,,,
        "Dennis Zhou (Facebook)" <>
Subject: [PATCH] blkcg: fix call_kern.cocci warnings

From: kbuild test robot <>

block/blk-cgroup.c:243:57-67: ERROR: function blkg_create called on line 1260 inside lock on line 1259 but uses GFP_KERNEL
block/blk-cgroup.c:243:57-67: ERROR: function blkg_create called on line 922 inside lock on line 911 but uses GFP_KERNEL

Generated by: scripts/coccinelle/locks/call_kern.cocci

Fixes: 6ef69a3a0b4a ("blkcg: change blkg reference counting to use percpu_ref")
CC: Dennis Zhou (Facebook) <>
Signed-off-by: kbuild test robot <>
Signed-off-by: Julia Lawall <>

base: for-next
:::::: branch date: 10 hours ago
:::::: commit date: 10 hours ago

The kbuild report doesn't include enough context to check this.  Please
check whether this is appropriate and whether another approach would be

 blk-cgroup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -240,7 +240,7 @@ static struct blkcg_gq *blkg_create(stru

-	ret = percpu_ref_init(&blkg->refcnt, __blkg_release, 0, GFP_KERNEL);
+	ret = percpu_ref_init(&blkg->refcnt, __blkg_release, 0, GFP_ATOMIC);
 	if (ret)
 		goto err_cancel_ref;

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