The patch titled
lockup_detector: convert cpu notifier to return encapsulate errno value
has been added to the -mm tree. Its filename is
lockup_detector-convert-cpu-notifier-to-return-encapsulate-errno-value.patch
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See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: lockup_detector: convert cpu notifier to return encapsulate errno value
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
By the commit e6bde73b07edeb703d4c89c1daabc09c303de11f ("cpu-hotplug:
return better errno on cpu hotplug failure"), the cpu notifier can return
encapsulate errno value.
This converts the cpu notifier to return encapsulate errno value for
lockup_detector.
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Acked-by: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/watchdog.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff -puN kernel/watchdog.c~lockup_detector-convert-cpu-notifier-to-return-encapsulate-errno-value kernel/watchdog.c
--- a/kernel/watchdog.c~lockup_detector-convert-cpu-notifier-to-return-encapsulate-errno-value
+++ a/kernel/watchdog.c
@@ -371,7 +371,7 @@ static int watchdog_nmi_enable(int cpu)
}
printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event);
- return -1;
+ return PTR_ERR(event);
/* success path */
out_save:
@@ -415,17 +415,19 @@ static int watchdog_prepare_cpu(int cpu)
static int watchdog_enable(int cpu)
{
struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+ int err;
/* enable the perf event */
- if (watchdog_nmi_enable(cpu) != 0)
- return -1;
+ err = watchdog_nmi_enable(cpu);
+ if (err)
+ return err;
/* create the watchdog thread */
if (!p) {
p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
if (IS_ERR(p)) {
printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
- return -1;
+ return PTR_ERR(p);
}
kthread_bind(p, cpu);
per_cpu(watchdog_touch_ts, cpu) = 0;
@@ -519,17 +521,16 @@ static int __cpuinit
cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
int hotcpu = (unsigned long)hcpu;
+ int err = 0;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
- if (watchdog_prepare_cpu(hotcpu))
- return NOTIFY_BAD;
+ err = watchdog_prepare_cpu(hotcpu);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
- if (watchdog_enable(hotcpu))
- return NOTIFY_BAD;
+ err = watchdog_enable(hotcpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_UP_CANCELED:
@@ -542,7 +543,7 @@ cpu_callback(struct notifier_block *nfb,
break;
#endif /* CONFIG_HOTPLUG_CPU */
}
- return NOTIFY_OK;
+ return notifier_from_errno(err);
}
static struct notifier_block __cpuinitdata cpu_nfb = {
@@ -558,7 +559,7 @@ static int __init spawn_watchdog_task(vo
return 0;
err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
- WARN_ON(err == NOTIFY_BAD);
+ WARN_ON(notifier_to_errno(err));
cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
register_cpu_notifier(&cpu_nfb);
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
stop_machine-convert-cpu-notifier-to-return-encapsulate-errno-value.patch
lockup_detector-convert-cpu-notifier-to-return-encapsulate-errno-value.patch
lockup_detector-remove-unnecessary-panic_notifier.patch
--
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