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[PATCH] fix spinlock-debugging smp_processor_id() usage 

When a spinlock debugging check hits, we print the CPU number as an
informational thing - but there is no guarantee that preemption is off
at that point - hence we should use raw_smp_processor_id().  Otherwise
DEBUG_PREEMPT will print a warning.

With this fix the warning goes away and only the spinlock-debugging info
is printed.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2005-12-20 11:54:17 +01:00 committed by Linus Torvalds
parent 391eadeec8
commit bb44f116a1
1 changed files with 10 additions and 8 deletions
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18
lib/spinlock_debug.c
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@ -20,7 +20,8 @@ static void spin_bug(spinlock_t *lock, const char *msg)
if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
owner = lock->owner;
printk("BUG: spinlock %s on CPU#%d, %s/%d\n",
msg, smp_processor_id(), current->comm, current->pid);
msg, raw_smp_processor_id(),
current->comm, current->pid);
printk(" lock: %p, .magic: %08x, .owner: %s/%d, .owner_cpu: %d\n",
lock, lock->magic,
owner ? owner->comm : "<none>",
@ -78,8 +79,8 @@ static void __spin_lock_debug(spinlock_t *lock)
if (print_once) {
print_once = 0;
printk("BUG: spinlock lockup on CPU#%d, %s/%d, %p\n",
smp_processor_id(), current->comm, current->pid,
lock);
raw_smp_processor_id(), current->comm,
current->pid, lock);
dump_stack();
}
}
@ -120,7 +121,8 @@ static void rwlock_bug(rwlock_t *lock, const char *msg)
if (xchg(&print_once, 0)) {
printk("BUG: rwlock %s on CPU#%d, %s/%d, %p\n", msg,
smp_processor_id(), current->comm, current->pid, lock);
raw_smp_processor_id(), current->comm,
current->pid, lock);
dump_stack();
#ifdef CONFIG_SMP
/*
@ -148,8 +150,8 @@ static void __read_lock_debug(rwlock_t *lock)
if (print_once) {
print_once = 0;
printk("BUG: read-lock lockup on CPU#%d, %s/%d, %p\n",
smp_processor_id(), current->comm, current->pid,
lock);
raw_smp_processor_id(), current->comm,
current->pid, lock);
dump_stack();
}
}
@ -220,8 +222,8 @@ static void __write_lock_debug(rwlock_t *lock)
if (print_once) {
print_once = 0;
printk("BUG: write-lock lockup on CPU#%d, %s/%d, %p\n",
smp_processor_id(), current->comm, current->pid,
lock);
raw_smp_processor_id(), current->comm,
current->pid, lock);
dump_stack();
}
}