linux-kernel - [PATCH 12/19] wait_bit: Parameterize the return variable to __wait_var_event

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Date:   Wed,  2 Mar 2022 04:34:44 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 12/19] wait_bit: Parameterize the return variable to __wait_var_event_timeout()

Macros should not refer to variables which aren't in their arguments.
Pass the name from its caller.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/wait_bit.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/wait_bit.h b/include/linux/wait_bit.h
index 227e6a20a978..46744e5e7d61 100644
--- a/include/linux/wait_bit.h
+++ b/include/linux/wait_bit.h
@@ -291,7 +291,7 @@ do {									\
 	__ret;								\
 })
 
-#define __wait_var_event_timeout(var, condition, timeout)		\
+#define __wait_var_event_timeout(var, condition, timeout, __ret)	\
 	___wait_var_event(var, ___wait_cond_timeout(condition, __ret),	\
 			  TASK_UNINTERRUPTIBLE, 0, timeout,		\
 			  __ret = schedule_timeout(__ret))
@@ -301,7 +301,8 @@ do {									\
 	long __ret = timeout;						\
 	might_sleep();							\
 	if (!___wait_cond_timeout(condition, __ret))			\
-		__ret = __wait_var_event_timeout(var, condition, timeout); \
+		__ret = __wait_var_event_timeout(var, condition,	\
+						timeout, __ret);	\
 	__ret;								\
 })
 
-- 
2.34.1