linux-kernel - [PATCH] staging: lustre: libcfs: add parens around macros args

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Date:   Tue, 22 May 2018 16:34:39 +0300
From:   Ivan Bornyakov <brnkv.i1@...il.com>
To:     lustre-devel@...ts.lustre.org
Cc:     oleg.drokin@...el.com, andreas.dilger@...el.com,
        jsimmons@...radead.org, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Ivan Bornyakov <brnkv.i1@...il.com>
Subject: [PATCH] staging: lustre: libcfs: add parens around macros args

One may call 'CFS_FAIL_TIMEOUT(id, secs + 5);' and get unexpected result
after macro substitution, viz., 'secs + 5' will turn into
'secs + 5 * 1000'

Signed-off-by: Ivan Bornyakov <brnkv.i1@...il.com>
---
 drivers/staging/lustre/include/linux/libcfs/libcfs_fail.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_fail.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_fail.h
index d6fc3164e7e7..f96b9a51554d 100644
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_fail.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_fail.h
@@ -140,7 +140,7 @@ static inline int cfs_fail_timeout_set(u32 id, u32 value, int ms, int set)
 
 /* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
 #define CFS_FAIL_TIMEOUT(id, secs) \
-	cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
+	cfs_fail_timeout_set(id, 0, (secs) * 1000, CFS_FAIL_LOC_NOSET)
 
 #define CFS_FAIL_TIMEOUT_MS(id, ms) \
 	cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
@@ -150,10 +150,10 @@ static inline int cfs_fail_timeout_set(u32 id, u32 value, int ms, int set)
  * sleep seconds or milliseconds
  */
 #define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
-	cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
+	cfs_fail_timeout_set(id, value, (secs) * 1000, CFS_FAIL_LOC_ORSET)
 
 #define CFS_FAIL_TIMEOUT_RESET(id, value, secs) \
-	cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_RESET)
+	cfs_fail_timeout_set(id, value, (secs) * 1000, CFS_FAIL_LOC_RESET)
 
 #define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
 	cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
-- 
2.16.1