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x86: add barriers statement 

goal is to have i386 and x86_64 closer, so we
add barriers to match

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber de Oliveira Costa 2008-03-19 14:25:12 -03:00 committed by Ingo Molnar
parent 148a30f8cf
commit fa8004d8e0
2 changed files with 5 additions and 0 deletions
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4
arch/x86/kernel/smpboot_32.c
View File

@ -180,6 +180,9 @@ static void __cpuinit start_secondary(void *unused)
smp_callin();
while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
cpu_relax();
/* otherwise gcc will move up smp_processor_id before the cpu_init */
barrier();
/*
* Check TSC synchronization with the BP:
*/
@ -432,6 +435,7 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mb();
atomic_set(&init_deasserted, 1);
/*

1
arch/x86/kernel/smpboot_64.c
View File

@ -239,6 +239,7 @@ void __cpuinit start_secondary(void)
setup_secondary_clock();
wmb();
cpu_idle();
}