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| author | Nathan Chancellor <natechancellor@gmail.com> | 2018-12-20 17:23:43 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-12-20 09:51:31 -0700 |
| commit | a52c5a16cf19d8a85831bb1b915a221dd4ffae3c (patch) | |
| tree | 97e32c8a66ef4eade4223663db16bcd68fe69e40 /include | |
| parent | f31e583aa2c20892aca3add26957dee6ab80a534 (diff) | |
| download | lwn-a52c5a16cf19d8a85831bb1b915a221dd4ffae3c.tar.gz lwn-a52c5a16cf19d8a85831bb1b915a221dd4ffae3c.zip | |
drbd: Avoid Clang warning about pointless switch statment
There are several warnings from Clang about no case statement matching
the constant 0:
In file included from drivers/block/drbd/drbd_receiver.c:48:
In file included from drivers/block/drbd/drbd_int.h:48:
In file included from ./include/linux/drbd_genl_api.h:54:
In file included from ./include/linux/genl_magic_struct.h:236:
./include/linux/drbd_genl.h:321:1: warning: no case matching constant
switch condition '0'
GENL_struct(DRBD_NLA_HELPER, 24, drbd_helper_info,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./include/linux/genl_magic_struct.h:220:10: note: expanded from macro
'GENL_struct'
switch (0) {
^
Silence this warning by adding a 'case 0:' statement. Additionally,
adjust the alignment of the statements in the ct_assert_unique macro to
avoid a checkpatch warning.
This solution was originally sent by Arnd Bergmann with a default case
statement: https://lore.kernel.org/patchwork/patch/756723/
Link: https://github.com/ClangBuiltLinux/linux/issues/43
Suggested-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/genl_magic_struct.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/genl_magic_struct.h b/include/linux/genl_magic_struct.h index 5972e4969197..eeae59d3ceb7 100644 --- a/include/linux/genl_magic_struct.h +++ b/include/linux/genl_magic_struct.h @@ -191,6 +191,7 @@ static inline void ct_assert_unique_operations(void) { switch (0) { #include GENL_MAGIC_INCLUDE_FILE + case 0: ; } } @@ -209,6 +210,7 @@ static inline void ct_assert_unique_top_level_attributes(void) { switch (0) { #include GENL_MAGIC_INCLUDE_FILE + case 0: ; } } @@ -218,7 +220,8 @@ static inline void ct_assert_unique_top_level_attributes(void) static inline void ct_assert_unique_ ## s_name ## _attributes(void) \ { \ switch (0) { \ - s_fields \ + s_fields \ + case 0: \ ; \ } \ } |