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From: Greg KH on 22 Apr 2010 16:40
2.6.33-stable review patch. If anyone has any objections, please let us know.

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

From: Jason Wessel <jason.wessel(a)windriver.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(a)windriver.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
LKML-Reference: <1269975907-27602-1-git-send-email-jason.wessel(a)windriver.com>
Signed-off-by: Frederic Weisbecker <fweisbec(a)gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.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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