linux-kernel - [PATCH 01/10] linux/device.h: use unique identifier for each struct

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Message-Id: <20190409212517.7321-2-linux@rasmusvillemoes.dk>
Date:   Tue,  9 Apr 2019 23:25:08 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jason Baron <jbaron@...mai.com>, linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 01/10] linux/device.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 dev_dbg_ratelimited by generating such an identifier via
__UNIQUE_ID and pass that to an extra level of macros.

No functional change.

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Jason Baron <jbaron@...mai.com>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 include/linux/device.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/device.h b/include/linux/device.h
index 4e6987e11f68..64b95a913fef 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1562,7 +1562,7 @@ do {									\
 	dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
 #if defined(CONFIG_DYNAMIC_DEBUG)
 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
-#define dev_dbg_ratelimited(dev, fmt, ...)				\
+#define _dev_dbg_ratelimited(descriptor, dev, fmt, ...)			\
 do {									\
 	static DEFINE_RATELIMIT_STATE(_rs,				\
 				      DEFAULT_RATELIMIT_INTERVAL,	\
@@ -1573,6 +1573,8 @@ do {									\
 		__dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt),	\
 				  ##__VA_ARGS__);			\
 } while (0)
+#define dev_dbg_ratelimited(dev, fmt, ...)				\
+	_dev_dbg_ratelimited(__UNIQUE_ID(ddebug), dev, fmt, ##__VA_ARGS__)
 #elif defined(DEBUG)
 #define dev_dbg_ratelimited(dev, fmt, ...)				\
 do {									\
-- 
2.20.1