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x86: do_boot_cpu - check if we have ESR register

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Impact: fix APIC IRQ irregularities on certain older boxes

We should touch the APIC ESR register if only we have it.

The patch fixes the problem mentioned by Max Kellermann:

	http://lkml.org/lkml/2008/10/17/147

Bisected-by: Max Kellermann <mk@cm4all.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
[ mingo@elte.hu: build fix ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cyrill Gorcunov 2008-10-22 18:00:09 +04:00 committed by Ingo Molnar
parent 8d433c407d
commit db96b0a0e4
1 changed files with 5 additions and 3 deletions
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8
arch/x86/kernel/smpboot.c
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@ -893,9 +893,11 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
smpboot_setup_warm_reset_vector(start_ip);
/*
* Be paranoid about clearing APIC errors.
*/
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
*/
if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
}
/*