linux-kernel - [PATCH 4.19 053/313] staging: erofs: fix the definition of DBG

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Date:   Mon, 11 Feb 2019 15:15:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 053/313] staging: erofs: fix the definition of DBG_BUGON

4.19-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@...wei.com>
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 367b39fe46e5..e6313c54e3ad 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))
 #endif
 
 #ifdef CONFIG_EROFS_FAULT_INJECTION
-- 
2.19.1