linux-kernel - [PATCH] ceph: fix clang warning for CEPH_DEFINE_OID

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Date:   Fri, 22 Mar 2019 15:08:11 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ilya Dryomov <idryomov@...il.com>, "Yan, Zheng" <zyan@...hat.com>,
        Sage Weil <sage@...hat.com>
Cc:     clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Alex Elder <elder@...aro.org>,
        ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ceph: fix clang warning for CEPH_DEFINE_OID_ONSTACK

clang complains about assigning a variable to itself during the
declaration:

fs/ceph/ioctl.c:187:26: error: variable 'oid' is uninitialized when used within its own initialization [-Werror,-Wuninitialized]
        CEPH_DEFINE_OID_ONSTACK(oid);
                                ^~~
include/linux/ceph/osdmap.h:122:52: note: expanded from macro 'CEPH_DEFINE_OID_ONSTACK'
        struct ceph_object_id oid = CEPH_OID_INIT_ONSTACK(oid)
                              ~~~                         ^~~
include/linux/ceph/osdmap.h:120:29: note: expanded from macro 'CEPH_OID_INIT_ONSTACK'
    ({ ceph_oid_init(&oid); oid; })
                            ^~~

We use this trick in other places, but it is completely unnecessary
here, as we can just use a regular struct initializer.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/ceph/osdmap.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 5675b1f09bc5..82f957a7a0d6 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -116,10 +116,8 @@ static inline void ceph_oid_init(struct ceph_object_id *oid)
 	oid->name_len = 0;
 }
 
-#define CEPH_OID_INIT_ONSTACK(oid)					\
-    ({ ceph_oid_init(&oid); oid; })
 #define CEPH_DEFINE_OID_ONSTACK(oid)					\
-	struct ceph_object_id oid = CEPH_OID_INIT_ONSTACK(oid)
+	struct ceph_object_id oid = { .name = oid.inline_name }
 
 static inline bool ceph_oid_empty(const struct ceph_object_id *oid)
 {
-- 
2.20.0