linux-kernel - [PATCH] tools/bootconfig: Fix wrong __VA_ARGS_

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Message-Id: <158108370130.2758.10893830923800978011.stgit@devnote2>
Date:   Fri,  7 Feb 2020 22:55:01 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] tools/bootconfig: Fix wrong __VA_ARGS__ usage

Since printk() wrapper macro uses __VA_ARGS__ without
"##" prefix, it causes a build error if there is no
variable arguments (e.g. only fmt is specified.)
To fix this error, use ##__VA_ARGS__ instead of
__VAR_ARGS__.

Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Reported-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 tools/bootconfig/include/linux/printk.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bootconfig/include/linux/printk.h b/tools/bootconfig/include/linux/printk.h
index 017bcd6912a5..e978a63d3222 100644
--- a/tools/bootconfig/include/linux/printk.h
+++ b/tools/bootconfig/include/linux/printk.h
@@ -7,7 +7,7 @@
 /* controllable printf */
 extern int pr_output;
 #define printk(fmt, ...)	\
-	(pr_output ? printf(fmt, __VA_ARGS__) : 0)
+	(pr_output ? printf(fmt, ##__VA_ARGS__) : 0)
 
 #define pr_err printk
 #define pr_warn	printk