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[PATCH] x86_64: avoid sending LOCAL_TIMER_VECTOR IPI to itself 

Ray Lee reported, that on an UP kernel with "noapic" command line option
set, the box locks hard during boot.

Adding some debug printks revealed, that the last action on the box
before stalling was "Send IPI" - a debug printk which was put into
smp_send_timer_broadcast_ipi().

It seems that send_IPI_mask(mask, LOCAL_TIMER_VECTOR) fails when
"noapic" is set on the command line on an UP kernel.

Aside of that it does not make much sense to trigger an interrupt
instead of calling the function directly on the CPU which gets the
PIT/HPET interrupt in case of broadcasting.

Reported-by: Ray Lee <ray-lk@madrabbit.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by:  Ray Lee <ray-lk@madrabbit.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2007-03-23 17:14:37 -07:00 committed by Linus Torvalds
parent 6ea65ff79c
commit f33bc55c47
1 changed files with 8 additions and 0 deletions
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8
arch/x86_64/kernel/apic.c
View File

@ -934,9 +934,17 @@ EXPORT_SYMBOL(switch_APIC_timer_to_ipi);
void smp_send_timer_broadcast_ipi(void) void smp_send_timer_broadcast_ipi(void)
{ {
int cpu = smp_processor_id();
cpumask_t mask; cpumask_t mask;
cpus_and(mask, cpu_online_map, timer_interrupt_broadcast_ipi_mask); cpus_and(mask, cpu_online_map, timer_interrupt_broadcast_ipi_mask);
if (cpu_isset(cpu, mask)) {
cpu_clear(cpu, mask);
add_pda(apic_timer_irqs, 1);
smp_local_timer_interrupt();
}
if (!cpus_empty(mask)) { if (!cpus_empty(mask)) {
send_IPI_mask(mask, LOCAL_TIMER_VECTOR); send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
} }