diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2011-01-02 23:02:42 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-01-03 05:25:52 +0100 |
| commit | 551423748a4eba55f2eb0fc250d757986471f187 (patch) | |
| tree | 401f03f7e5a70de089ef83153ac98096929c6f09 | |
| parent | b518a64983cbf2ff31aed530898de2d80e4573d5 (diff) | |
watchdog: Improve initialisation error message and documentation
The error message 'NMI watchdog failed to create perf event...'
does not make it clear that this is a fatal error for the
watchdog. It also currently prints the error value as a
pointer, rather than extracting the error code with PTR_ERR().
Fix that.
Add a note to the description of the 'nowatchdog' kernel
parameter to associate it with this message.
Reported-by: Cesare Leonardi <celeonar@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: 599368@bugs.debian.org
Cc: 608138@bugs.debian.org
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: <stable@kernel.org> # .37.x and later
LKML-Reference: <1294009362.3167.126.camel@localhost>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | kernel/watchdog.c | 3 |
2 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 8b61c936099..01ece1b9213 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1759,7 +1759,7 @@ and is between 256 and 4096 characters. It is defined in the file nousb [USB] Disable the USB subsystem - nowatchdog [KNL] Disable the lockup detector. + nowatchdog [KNL] Disable the lockup detector (NMI watchdog). nowb [ARM] diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 6e3c41a4024..5b082156cd2 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -364,7 +364,8 @@ static int watchdog_nmi_enable(int cpu) goto out_save; } - printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event); + printk(KERN_ERR "NMI watchdog disabled for cpu%i: unable to create perf event: %ld\n", + cpu, PTR_ERR(event)); return PTR_ERR(event); /* success path */ |