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[PATCH] check return value of cpu_callback

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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>
This commit is contained in:
Akinobu Mita 2006-09-29 02:00:22 -07:00 committed by Linus Torvalds
parent 6c2d8b5dca
commit 07dccf3344
4 changed files with 11 additions and 4 deletions
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4
kernel/sched.c
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@ -5272,9 +5272,11 @@ static struct notifier_block __cpuinitdata migration_notifier = {
int __init migration_init(void)
{
void *cpu = (void *)(long)smp_processor_id();
int err;
/* Start one for the boot CPU: */
migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
BUG_ON(err == NOTIFY_BAD);
migration_call(&migration_notifier, CPU_ONLINE, cpu);
register_cpu_notifier(&migration_notifier);

4
kernel/softirq.c
View file

@ -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;

3
kernel/softlockup.c
View file

@ -149,8 +149,9 @@ static struct notifier_block __cpuinitdata cpu_nfb = {
__init void spawn_softlockup_task(void)
{
void *cpu = (void *)(long)smp_processor_id();
int err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
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);

4
kernel/timer.c
View file

@ -1694,8 +1694,10 @@ static struct notifier_block __cpuinitdata timers_nb = {
void __init init_timers(void)
{
timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
BUG_ON(err == NOTIFY_BAD);
register_cpu_notifier(&timers_nb);
open_softirq(TIMER_SOFTIRQ, run_timer_softirq, NULL);
}