[PATCH 4.20 060/352] staging: erofs: fix the definition of DBG_BUGON

From: Greg Kroah-Hartman
Date: Mon Feb 11 2019 - 09:23:32 EST

4.20-stable review patch. If anyone has any objections, please let me know.


[ Upstream commit eef168789866514e5d4316f030131c9fe65b643f ]

It's better not to positively BUG_ON the kernel, however developers
need a way to locate issues as soon as possible.

DBG_BUGON is introduced and it could only crash when EROFS_FS_DEBUG
(EROFS developping feature) is on. It is helpful for developers
to find and solve bugs quickly by eng builds.

Previously, DBG_BUGON is defined as ((void)0) if EROFS_FS_DEBUG is off,
but some unused variable warnings as follows could occur:

drivers/staging/erofs/unzip_vle.c: In function `init_alway:':
drivers/staging/erofs/unzip_vle.c:61:33: warning: unused variable `work' [-Wunused-variable]
struct z_erofs_vle_work *const work =

Fix it to #define DBG_BUGON(x) ((void)(x)).

Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/staging/erofs/internal.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index 57575c7f5635..048fb034b5aa 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -39,7 +39,7 @@
#define debugln(x, ...) ((void)0)

#define dbg_might_sleep() ((void)0)
-#define DBG_BUGON(...) ((void)0)
+#define DBG_BUGON(x) ((void)(x))

enum {