linux-kernel - [PATCH 5.3 036/105] rbd: silence bogus uninitialized warning in rbd_object_map_update

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Message-Id: <20191211150234.019427732@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:05:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kbuild test robot <lkp@...el.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Dongsheng Yang <dongsheng.yang@...ystack.cn>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.3 036/105] rbd: silence bogus uninitialized warning in rbd_object_map_update_finish()

From: Ilya Dryomov <idryomov@...il.com>

[ Upstream commit 633739b2fedb6617d782ca252797b7a8ad754347 ]

Some versions of gcc (so far 6.3 and 7.4) throw a warning:

  drivers/block/rbd.c: In function 'rbd_object_map_callback':
  drivers/block/rbd.c:2124:21: warning: 'current_state' may be used uninitialized in this function [-Wmaybe-uninitialized]
        (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN))
  drivers/block/rbd.c:2092:23: note: 'current_state' was declared here
    u8 state, new_state, current_state;
                          ^~~~~~~~~~~~~

It's bogus because all current_state accesses are guarded by
has_current_state.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@...ystack.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/rbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index c8fb886aebd4e..64e364c4a0fb8 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2089,7 +2089,7 @@ static int rbd_object_map_update_finish(struct rbd_obj_request *obj_req,
 	struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
 	struct ceph_osd_data *osd_data;
 	u64 objno;
-	u8 state, new_state, current_state;
+	u8 state, new_state, uninitialized_var(current_state);
 	bool has_current_state;
 	void *p;
 
-- 
2.20.1