linux-kernel - [for-linus][PATCH 1/4] tools/bootconfig: Fix wrong __VA_ARGS_

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Date:   Mon, 10 Feb 2020 09:44:56 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [for-linus][PATCH 1/4] tools/bootconfig: Fix wrong __VA_ARGS__ usage

From: Masami Hiramatsu <mhiramat@...nel.org>

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__.

Link: http://lkml.kernel.org/r/158108370130.2758.10893830923800978011.stgit@devnote2

Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Reported-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.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
-- 
2.24.1