linux-kernel - [PATCH 06/22] linux/printk.h: use unique identifier for each struct

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Message-Id: <20180919220444.23190-7-linux@rasmusvillemoes.dk>
Date:   Thu, 20 Sep 2018 00:04:28 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Jason Baron <jbaron@...mai.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 06/22] linux/printk.h: use unique identifier for each struct _ddebug

Changes on x86-64 later in this series require that all struct _ddebug
descriptors in a translation unit uses distinct identifiers. Realize
that for pr_debug_ratelimited by generating such an identifier via
__UNIQUE_ID and pass that to an extra level of macros.

No functional change.

Cc: Petr Mladek <pmladek@...e.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 include/linux/printk.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index d3ba3245531d..70df2c578d40 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -460,7 +460,7 @@ extern int kptr_restrict;
 /* If you are writing a driver, please use dev_dbg instead */
 #if defined(CONFIG_DYNAMIC_DEBUG)
 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
-#define pr_debug_ratelimited(fmt, ...)					\
+#define _pr_debug_ratelimited(descriptor, fmt, ...)			\
 do {									\
 	static DEFINE_RATELIMIT_STATE(_rs,				\
 				      DEFAULT_RATELIMIT_INTERVAL,	\
@@ -470,6 +470,8 @@ do {									\
 	    __ratelimit(&_rs))						\
 		__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);	\
 } while (0)
+#define pr_debug_ratelimited(fmt, ...)		\
+	_pr_debug_ratelimited(__UNIQUE_ID(ddebug), fmt, ##__VA_ARGS__)
 #elif defined(DEBUG)
 #define pr_debug_ratelimited(fmt, ...)					\
 	printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
-- 
2.16.4