x86,kgdb: Always initialize the hw breakpoint attribute

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

diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index bfba6019d762aa6652e58b3b09681a83b2e74525..b2258ca9100349c2618d00e4aadf8c7cdd62bb26 100644 (file)
--- 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;