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x86: provide __smp_call_function

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This function is used in smp_send_stop(). It's like
smp_call_function_mask, but always go to all online cpus,
and does not take any locks.

It is added to x86_64, but will soon be unified in a common file

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-03-03 14:12:46 -03:00 committed by Ingo Molnar
parent e32640a2cd
commit 3a36d1e435
1 changed files with 33 additions and 1 deletions
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34
arch/x86/kernel/smp_64.c
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@ -322,6 +322,38 @@ void unlock_ipi_call_lock(void)
spin_unlock_irq(&call_lock);
}
static void __smp_call_function(void (*func) (void *info), void *info,
int nonatomic, int wait)
{
struct call_data_struct data;
int cpus = num_online_cpus() - 1;
if (!cpus)
return;
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
data.wait = wait;
if (wait)
atomic_set(&data.finished, 0);
call_data = &data;
mb();
/* Send a message to all other CPUs and wait for them to respond */
send_IPI_allbutself(CALL_FUNCTION_VECTOR);
/* Wait for response */
while (atomic_read(&data.started) != cpus)
cpu_relax();
if (wait)
while (atomic_read(&data.finished) != cpus)
cpu_relax();
}
/*
* this function sends a 'generic call function' IPI to all other CPU
* of the system defined in the mask.
@ -424,7 +456,7 @@ void smp_send_stop(void)
/* Don't deadlock on the call lock in panic */
nolock = !spin_trylock(&call_lock);
local_irq_save(flags);
__smp_call_function_mask(cpu_online_map, stop_this_cpu, NULL, 0);
__smp_call_function(stop_this_cpu, NULL, 0, 0);
if (!nolock)
spin_unlock(&call_lock);
disable_local_APIC();