[PATCH] Fix HPET operation on 32-bit NVIDIA platforms

[PATCH] Fix HPET operation on 32-bit NVIDIA platforms

From: "Andy Currid" <[email protected]>

This patch fixes a kernel panic during boot that occurs on NVIDIA platforms
that have HPET enabled.

When HPET is enabled, the standard timer IRQ is routed to IOAPIC pin 2 and is
advertised as such in the ACPI APIC table - but an earlier workaround in the
kernel was ignoring this override.  The fix is to honor timer IRQ overrides
from ACPI when HPET is detected on an NVIDIA platform.

Signed-off-by: Andy Currid <[email protected]>
Cc: "Brown, Len" <[email protected]>
Cc: "Yu, Luming" <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>