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smp_call_function_interrupt: use typedef and %pf

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Use the newly added smp_call_func_t in smp_call_function_interrupt for
the func variable, and make the comment above the WARN more assertive
and explicit.  Also, func is a function pointer and does not need an
offset, so use %pf not %pS.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Milton Miller 2011-03-15 13:27:17 -06:00 committed by Linus Torvalds
parent 723aae25d5
commit c8def554d0
1 changed files with 8 additions and 8 deletions
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16
kernel/smp.c
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@ -194,7 +194,7 @@ void generic_smp_call_function_interrupt(void)
*/
list_for_each_entry_rcu(data, &call_function.queue, csd.list) {
int refs;
void (*func) (void *info);
smp_call_func_t func;
/*
* Since we walk the list without any locks, we might
@ -214,17 +214,17 @@ void generic_smp_call_function_interrupt(void)
if (atomic_read(&data->refs) == 0)
continue;
func = data->csd.func; /* for later warn */
data->csd.func(data->csd.info);
func = data->csd.func; /* save for later warn */
func(data->csd.info);
/*
* If the cpu mask is not still set then it enabled interrupts,
* we took another smp interrupt, and executed the function
* twice on this cpu. In theory that copy decremented refs.
* If the cpu mask is not still set then func enabled
* interrupts (BUG), and this cpu took another smp call
* function interrupt and executed func(info) twice
* on this cpu. That nested execution decremented refs.
*/
if (!cpumask_test_and_clear_cpu(cpu, data->cpumask)) {
WARN(1, "%pS enabled interrupts and double executed\n",
func);
WARN(1, "%pf enabled interrupts and double executed\n", func);
continue;
}