linux-kernel - [PATCH 1/2] init/main.c: execute lockdep

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Message-Id: <1321508072-23853-1-git-send-email-tom.leiming@gmail.com>
Date:	Thu, 17 Nov 2011 13:34:31 +0800
From:	tom.leiming@...il.com
To:	mingo@...e.hu, a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, Ming Lei <tom.leiming@...il.com>
Subject: [PATCH 1/2] init/main.c: execute lockdep_init as early as possible

From: Ming Lei <tom.leiming@...il.com>

This patch removes the lockdep warning[1] on ARM platform.
The warning is caused by printk inside smp_setup_processor_id.

It is safe to do this because lockdep_init doesn't depend on
smp_setup_processor_id, so make printk can be called as early
as possible without lockdep complainment.

[1], lockdep warning
[    0.000000] WARNING: lockdep init error! Arch code didn't call
lockdep_init() early enough?
[    0.000000] Call stack leading to lockdep invocation was:
[    0.000000]  [<c00164bc>] save_stack_trace_tsk+0x0/0x90
[    0.000000]  [<ffffffff>] 0xffffffff

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 init/main.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/init/main.c b/init/main.c
index 217ed23..2c76efb 100644
--- a/init/main.c
+++ b/init/main.c
@@ -469,13 +469,12 @@ asmlinkage void __init start_kernel(void)
 	char * command_line;
 	extern const struct kernel_param __start___param[], __stop___param[];
 
-	smp_setup_processor_id();
-
 	/*
 	 * Need to run as early as possible, to initialize the
 	 * lockdep hash:
 	 */
 	lockdep_init();
+	smp_setup_processor_id();
 	debug_objects_early_init();
 
 	/*
-- 
1.7.5.4

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