linux-kernel - [PATCH 02/10] blkcg: make ->cpd_init

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Message-Id: <20190614015620.1587672-3-tj@kernel.org>
Date:   Thu, 13 Jun 2019 18:56:12 -0700
From:   Tejun Heo <tj@...nel.org>
To:     axboe@...nel.dk, newella@...com, clm@...com, josef@...icpanda.com,
        dennisz@...com, lizefan@...wei.com, hannes@...xchg.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, kafai@...com, songliubraving@...com,
        yhs@...com, bpf@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/10] blkcg: make ->cpd_init_fn() optional

For policies which can do enough initialization from ->cpd_alloc_fn(),
make ->cpd_init_fn() optional.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 block/blk-cgroup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 30d3a0fbccac..60ad9b96e6eb 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1534,7 +1534,8 @@ int blkcg_policy_register(struct blkcg_policy *pol)
 			blkcg->cpd[pol->plid] = cpd;
 			cpd->blkcg = blkcg;
 			cpd->plid = pol->plid;
-			pol->cpd_init_fn(cpd);
+			if (pol->cpd_init_fn)
+				pol->cpd_init_fn(cpd);
 		}
 	}
 
-- 
2.17.1