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| author | Akinobu Mita <mita@miraclelinux.com> | 2006-09-29 02:00:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:14 -0700 |
| commit | 07dccf3344010f9b9df7fe725da7e73bca2992df (patch) | |
| tree | 696730ef4e1bf85a24eac84713921746f74c7c10 /kernel/softirq.c | |
| parent | 6c2d8b5dcad468cb0bdec3368b53383bde51e487 (diff) | |
| download | lwn-07dccf3344010f9b9df7fe725da7e73bca2992df.tar.gz lwn-07dccf3344010f9b9df7fe725da7e73bca2992df.zip | |
[PATCH] check return value of cpu_callback
Spawing ksoftirqd, migration, or watchdog, and calling init_timers_cpu()
may fail with small memory. If it happens in initcalls, kernel NULL
pointer dereference happens later. This patch makes crash happen
immediately in such cases. It seems a bit better than getting kernel NULL
pointer dereference later.
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c index 3789ca98197c..bf25015dce16 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -612,7 +612,9 @@ static struct notifier_block __cpuinitdata cpu_nfb = { __init int spawn_ksoftirqd(void) { void *cpu = (void *)(long)smp_processor_id(); - cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); + int err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); + + BUG_ON(err == NOTIFY_BAD); cpu_callback(&cpu_nfb, CPU_ONLINE, cpu); register_cpu_notifier(&cpu_nfb); return 0; |