linux-kernel - [PATCH v6 1/8] linux/device.h: use unique identifier for each struct

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Date:   Tue, 18 Jun 2019 00:20:27 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jason Baron <jbaron@...mai.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v6 1/8] 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 848fc71c6ba6..eaba6952c2b3 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1563,7 +1563,7 @@ 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,	\
@@ -1574,6 +1574,8 @@ 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