From f98b0b6695b63a65e3c533b5aeb2f8e31972df74 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Thu, 20 Dec 2018 17:23:43 +0100 Subject: [PATCH] drbd: Avoid Clang warning about pointless switch statment [ Upstream commit a52c5a16cf19d8a85831bb1b915a221dd4ffae3c ] 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 Signed-off-by: Nathan Chancellor Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- include/linux/genl_magic_struct.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/genl_magic_struct.h b/include/linux/genl_magic_struct.h index eecd19b..250e9be 100644 --- a/include/linux/genl_magic_struct.h +++ b/include/linux/genl_magic_struct.h @@ -185,6 +185,7 @@ static inline void ct_assert_unique_operations(void) { switch (0) { #include GENL_MAGIC_INCLUDE_FILE + case 0: ; } } @@ -203,6 +204,7 @@ static inline void ct_assert_unique_top_level_attributes(void) { switch (0) { #include GENL_MAGIC_INCLUDE_FILE + case 0: ; } } @@ -212,7 +214,8 @@ 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: \ ; \ } \ } -- 2.7.4