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authorIngo Molnar <mingo@elte.hu>2007-10-17 10:26:06 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 19:42:47 +0400
commita115d5caca1a2905ba7a32b408a6042b20179aaa (patch)
treefe79f98f103d0d8776ca7971882e9c21753ae67f
parenta3b13c23f186ecb57204580cc1f2dbe9c284953a (diff)
downloadlinux-a115d5caca1a2905ba7a32b408a6042b20179aaa.tar.xz
fix the softlockup watchdog to actually work
this Xen related commit: commit 966812dc98e6a7fcdf759cbfa0efab77500a8868 Author: Jeremy Fitzhardinge <jeremy@goop.org> Date: Tue May 8 00:28:02 2007 -0700 Ignore stolen time in the softlockup watchdog broke the softlockup watchdog to never report any lockups. (!) print_timestamp defaults to 0, this makes the following condition always true: if (print_timestamp < (touch_timestamp + 1) || and we'll in essence never report soft lockups. apparently the functionality of the soft lockup watchdog was never actually tested with that patch applied ... Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/softlockup.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 68f7606b4160..e423b3a918fd 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -82,10 +82,11 @@ void softlockup_tick(void)
print_timestamp = per_cpu(print_timestamp, this_cpu);
/* report at most once a second */
- if (print_timestamp < (touch_timestamp + 1) ||
- did_panic ||
- !per_cpu(watchdog_task, this_cpu))
+ if ((print_timestamp >= touch_timestamp &&
+ print_timestamp < (touch_timestamp + 1)) ||
+ did_panic || !per_cpu(watchdog_task, this_cpu)) {
return;
+ }
/* do not print during early bootup: */
if (unlikely(system_state != SYSTEM_RUNNING)) {