x86: I/O APIC: timer through 8259A second-chance

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Some systems incorrectly report the ExtINTA pin of the I/O APIC as the
genuine target of the timer interrupt.  Here is a change that copies timer
pin information found to the other pin if one has been found only.  This
way both a direct and a through-8259A route is tested with the pin letting
these problematic systems work well enough.  If no timer pin information
has been found for the I/O APIC, then local APIC variations are tried
only, similarly to what is done without the change (except without the
misleading messages).

Obviously if we try the first-chance path without being told by the BIOS
to do so, we should not complain either, so do not print the message in
this case.

The 64-bit variation should be updated with a call to
replace_pin_at_irq() which can be done with the upcoming merge.  Since
add_pin_to_irq() is now always called in the first-chance path, the
condition to require it in the second-chance path no longer happens.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Maciej W. Rozycki 2008-05-27 21:19:51 +01:00 • committed by Ingo Molnar

parent 03be750559

commit 691874fa96

2 changed files with 57 additions and 17 deletions

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38

arch/x86/kernel/io_apic_32.c

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36

arch/x86/kernel/io_apic_64.c

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