linux-kernel - [PATCH] tracing/ring-buffer: don't annotate rb_cpu_notify with _

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Message-Id: <1237606416-22268-1-git-send-email-fweisbec@gmail.com>
Date:	Sat, 21 Mar 2009 04:33:36 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH] tracing/ring-buffer: don't annotate rb_cpu_notify with __cpuinit

Impact: remove a section warning

CONFIG_DEBUG_SECTION_MISMATCH raises the following warning on -tip:

WARNING: kernel/trace/built-in.o(.text+0x5bc5): Section mismatch in
reference from the function ring_buffer_alloc() to the function
.cpuinit.text:rb_cpu_notify()
The function ring_buffer_alloc() references
the function __cpuinit rb_cpu_notify().

This is actually harmless. The code in the ring buffer don't build
rb_cpu_notify and other cpu hotplug stuffs when !CONFIG_HOTPLUG_CPU
so we have no risk to reference freed memory here (it would even
be harmless if we unconditionally build it because register_cpu_notifier
would do nothing when !CONFIG_HOTPLUG_CPU.

But since ring_buffer_alloc() can be called everytime, we don't want it
to be annotated with __cpuinit so we drop the __cpuinit from
rb_cpu_notify.
This is not a waste of memory because it is only defined and used on
CONFIG_HOTPLUG_CPU.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/trace/ring_buffer.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index bc74f00..7e05e2c 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -536,8 +536,8 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
 extern int ring_buffer_page_too_big(void);

 #ifdef CONFIG_HOTPLUG_CPU
-static int __cpuinit rb_cpu_notify(struct notifier_block *self,
-				   unsigned long action, void *hcpu);
+static int rb_cpu_notify(struct notifier_block *self,
+			 unsigned long action, void *hcpu);
 #endif

 /**
@@ -2787,8 +2787,8 @@ static __init int rb_init_debugfs(void)
 fs_initcall(rb_init_debugfs);

 #ifdef CONFIG_HOTPLUG_CPU
-static int __cpuinit rb_cpu_notify(struct notifier_block *self,
-				   unsigned long action, void *hcpu)
+static int rb_cpu_notify(struct notifier_block *self,
+			 unsigned long action, void *hcpu)
 {
 	struct ring_buffer *buffer =
 		container_of(self, struct ring_buffer, cpu_notify);
-- 
1.6.1

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