kdump: Execute kmsg_dump(KMSG_DUMP_PANIC) after smp_send_stop()

This patch moves kmsg_dump(KMSG_DUMP_PANIC) below smp_send_stop(),
to serialize the crash-logging process via smp_send_stop() and to
thus retrieve a more stable crash image of all CPUs stopped.

Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Cc: dle-develop@lists.sourceforge.net <dle-develop@lists.sourceforge.net>
Cc: Satoru Moriya <satoru.moriya@hds.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: a.p.zijlstra@chello.nl <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/5C4C569E8A4B9B42A84A977CF070A35B2E4D7A5CE2@USINDEVS01.corp.hds.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/panic.c b/kernel/panic.c
index b6215b7ce99dcb7b6348caffbd8292090e9c3f4c..d2a5f4ecc6ddd2ebc2da68764da646c7b96d9fc9 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -108,8 +108,6 @@ void panic(const char *fmt, ...)
         */
        crash_kexec(NULL);
 
-       kmsg_dump(KMSG_DUMP_PANIC);
-
        /*
         * Note smp_send_stop is the usual smp shutdown function, which
         * unfortunately means it may not be hardened to work in a panic
@@ -117,6 +115,8 @@ void panic(const char *fmt, ...)
         */
        smp_send_stop();
 
+       kmsg_dump(KMSG_DUMP_PANIC);
+
        atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
 
        bust_spinlocks(0);