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>
diff --git a/include/linux/genl_magic_struct.h b/include/linux/genl_magic_struct.h
index 5972e49..eeae59d 100644
--- a/include/linux/genl_magic_struct.h
+++ b/include/linux/genl_magic_struct.h
@@ -191,6 +191,7 @@
{
switch (0) {
#include GENL_MAGIC_INCLUDE_FILE
+ case 0:
;
}
}
@@ -209,6 +210,7 @@
{
switch (0) {
#include GENL_MAGIC_INCLUDE_FILE
+ case 0:
;
}
}
@@ -218,7 +220,8 @@
static inline void ct_assert_unique_ ## s_name ## _attributes(void) \
{ \
switch (0) { \
- s_fields \
+ s_fields \
+ case 0: \
; \
} \
}