linux-kernel - [PATCH 02/10] linux/net.h: use unique identifier for each struct

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Message-Id: <20190409212517.7321-3-linux@rasmusvillemoes.dk>
Date:   Tue,  9 Apr 2019 23:25:09 +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>,
        netdev@...r.kernel.org
Subject: [PATCH 02/10] linux/net.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 net_dbg_ratelimited by generating such an identifier via
__UNIQUE_ID and pass that to an extra level of macros.

No functional change.

Cc: netdev@...r.kernel.org
Acked-by: Jason Baron <jbaron@...mai.com>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 include/linux/net.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/net.h b/include/linux/net.h
index c606c72311d0..828e0db1e63a 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -266,7 +266,7 @@ do {								\
 #define net_info_ratelimited(fmt, ...)				\
 	net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
 #if defined(CONFIG_DYNAMIC_DEBUG)
-#define net_dbg_ratelimited(fmt, ...)					\
+#define _net_dbg_ratelimited(descriptor, fmt, ...)			\
 do {									\
 	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\
 	if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\
@@ -274,6 +274,8 @@ do {									\
 		__dynamic_pr_debug(&descriptor, pr_fmt(fmt),		\
 		                   ##__VA_ARGS__);			\
 } while (0)
+#define net_dbg_ratelimited(fmt, ...)					\
+	_net_dbg_ratelimited(__UNIQUE_ID(ddebug), fmt, ##__VA_ARGS__)
 #elif defined(DEBUG)
 #define net_dbg_ratelimited(fmt, ...)				\
 	net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
-- 
2.20.1