The patch titled
Subject: kernel/watchdog: use nmi registers snapshot in hardlockup handler
has been added to the -mm tree. Its filename is
kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Subject: kernel/watchdog: use nmi registers snapshot in hardlockup handler
NMI handler doesn't call set_irq_regs(), so get_irq_regs() returns NULL or
stale snapshot from beginning of IRQ interrupted by NMI. Registers from
argument are always here and points to interrupted instruction and state.
Link: http://lkml.kernel.org/r/146771764784.86724.6006627197118544150.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Ulrich Obergfell <uobergfe@xxxxxxxxxx>
Cc: Aaron Tomlin <atomlin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/watchdog.c | 1 -
1 file changed, 1 deletion(-)
diff -puN kernel/watchdog.c~kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler kernel/watchdog.c
--- a/kernel/watchdog.c~kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler
+++ a/kernel/watchdog.c
@@ -344,7 +344,6 @@ static void watchdog_overflow_callback(s
*/
if (is_hardlockup()) {
int this_cpu = smp_processor_id();
- struct pt_regs *regs = get_irq_regs();
/* only print hardlockups once */
if (__this_cpu_read(hard_watchdog_warn) == true)
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxxxxxx are
kernel-watchdog-use-nmi-registers-snapshot-in-hardlockup-handler.patch
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