From eac243355a99d6b9d41bbeba4fc83e7f735485f9 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Tue, 31 Aug 2010 23:00:08 -0400 Subject: [PATCH] lockup_detector: Convert cpu notifier to return encapsulate errno value By the commit e6bde73b07edeb703d4c89c1daabc09c303de11f ("cpu-hotplug: return better errno on cpu hotplug failure"), the cpu notifier can return encapsulate errno value, resulting in more meaningful error codes for CPU hotplug failures. This converts the cpu notifier to return encapsulate errno value for the lockup_detector as well. Signed-off-by: Akinobu Mita Cc: peterz@infradead.org Cc: gorcunov@gmail.com Cc: fweisbec@gmail.com LKML-Reference: <1283310009-22168-3-git-send-email-dzickus@redhat.com> Signed-off-by: Don Zickus Signed-off-by: Ingo Molnar --- kernel/watchdog.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 0d53c8e..501cb6e 100644 --- a/kernel/watchdog.c +++ b/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, unsigned long action, void *hcpu) 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(void) 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); -- 2.7.4