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| author |   Arnd Bergmann <arnd@arndb.de> | 2019-03-22 15:36:37 +0100 |
|---|---|---|
| committer |   Ilya Dryomov <idryomov@gmail.com> | 2019-05-07 19:22:36 +0200 |
| commit | d342a15b1e8547fd033f65ce949a8d8501e5ac8f (patch) | |
| tree | b225e6f1e34d717819027df4d8ef83d5dccc6d0d /drivers/block/rbd.c | |
| parent | ceph: snapshot nfs re-export (diff) | |
| download | linux-dev-d342a15b1e8547fd033f65ce949a8d8501e5ac8f.tar.xz linux-dev-d342a15b1e8547fd033f65ce949a8d8501e5ac8f.zip | |
rbd: avoid clang -Wuninitialized warning
clang fails to see that rbd_assert(0) ends in an unreachable code
path and warns about a subsequent use of an uninitialized variable
when CONFIG_PROFILE_ANNOTATED_BRANCHES is set:
drivers/block/rbd.c:2402:4: error: variable 'ret' is used uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
rbd_assert(0);
^~~~~~~~~~~~~
drivers/block/rbd.c:563:7: note: expanded from macro 'rbd_assert'
if (unlikely(!(expr))) { \
^~~~~~~~~~~~~~~~~
include/linux/compiler.h:48:23: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/block/rbd.c:2410:6: note: uninitialized use occurs here
if (ret) {
^~~
drivers/block/rbd.c:2402:4: note: remove the 'if' if its condition is always true
rbd_assert(0);
^
drivers/block/rbd.c:563:3: note: expanded from macro 'rbd_assert'
if (unlikely(!(expr))) { \
^
drivers/block/rbd.c:2376:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
1 error generated.
This seems to be a bug in clang, but is easy to work around by using
an unconditional BUG().
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'drivers/block/rbd.c')
| -rw-r--r-- | drivers/block/rbd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 2210c1b9491b..414037fef3ef 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -2383,7 +2383,7 @@ static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) &obj_req->bvec_pos); break; default: - rbd_assert(0); + BUG(); } } else { ret = rbd_img_fill_from_bvecs(child_img_req, |