linux-kernel - [PATCH 2/2] x86,kgdb: Always initialize the hw breakpoint attribute

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Date:	Wed, 31 Mar 2010 05:58:47 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	Ingo Molnar <mingo@...e.hu>, "2.6.33" <stable@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 2/2] x86,kgdb: Always initialize the hw breakpoint attribute

From: Jason Wessel <jason.wessel@...driver.com>

It is required to call hw_breakpoint_init() on an attr before using it
in any other calls.  This fixes the problem where kgdb will sometimes
fail to initialize on x86_64.

Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: 2.6.33 <stable@...nel.org>
LKML-Reference: <1269975907-27602-1-git-send-email-jason.wessel@...driver.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/kgdb.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index bfba601..b2258ca 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -618,8 +618,8 @@ int kgdb_arch_init(void)
 	 * portion of kgdb because this operation requires mutexs to
 	 * complete.
 	 */
+	hw_breakpoint_init(&attr);
 	attr.bp_addr = (unsigned long)kgdb_arch_init;
-	attr.type = PERF_TYPE_BREAKPOINT;
 	attr.bp_len = HW_BREAKPOINT_LEN_1;
 	attr.bp_type = HW_BREAKPOINT_W;
 	attr.disabled = 1;
-- 
1.6.2.3

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