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[PATCH] CPU hotplug printk fix

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In the cpu hotplug case, per-cpu data possibly isn't initialized even the
system state is 'running'.  As the comments say in the original code, some
console drivers assume per-cpu resources have been allocated.  radeon fb is
one such driver, which uses kmalloc.  After a CPU is down, the per-cpu data
of slab is freed, so the system crashed when printing some info.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shaohua Li 2005-06-25 14:55:15 -07:00 committed by Linus Torvalds
parent 8d783b3e02
commit ac25575203
1 changed files with 1 additions and 2 deletions
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3
kernel/printk.c
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@ -588,8 +588,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
log_level_unknown = 1;
}
if (!cpu_online(smp_processor_id()) &&
system_state != SYSTEM_RUNNING) {
if (!cpu_online(smp_processor_id())) {
/*
* Some console drivers may assume that per-cpu resources have
* been allocated. So don't allow them to be called by this