linux-kernel - [015/139] x86,kgdb: Always initialize the hw breakpoint attribute

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Message-Id: <20100422195406.270390637@kvm.kroah.org>
Date:	Thu, 22 Apr 2010 12:53:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jason Wessel <jason.wessel@...driver.com>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [015/139] x86,kgdb: Always initialize the hw breakpoint attribute

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

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

commit ab310b5edb8b601bcb02491ed6f7676da4fd1757 upstream.

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>
LKML-Reference: <1269975907-27602-1-git-send-email-jason.wessel@...driver.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/kgdb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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;


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