[patch 85/96] Fix no_timer_check on x86_64

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alexander Graf <agraf@xxxxxxx>

fixed upstream in 2.6.28 in merge of ioapic*.c for x86

In io_apic_32.c the logic of no_timer_check is "always make timer_irq_works
return 1".

Io_apic_64.c on the other hand checks for
  if (!no_timer_check && timer_irq_works())
basically meaning "make timer_irq_works fail" in the crucial first check.

Now, in order to not move too much code, we can just reverse the logic here
and should be fine off, basically rendering no_timer_check useful again.

This issue seems to be resolved as of 2.6.28 by the merge of io_apic*.c,
but still exists for at least 2.6.27.

Signed-off-by: Alexander Graf <agraf@xxxxxxx>
Acked-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>


---
 arch/x86/kernel/io_apic_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -1729,7 +1729,7 @@ static inline void __init check_timer(vo
 			setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
 		}
 		unmask_IO_APIC_irq(0);
-		if (!no_timer_check && timer_irq_works()) {
+		if (no_timer_check || timer_irq_works()) {
 			if (nmi_watchdog == NMI_IO_APIC) {
 				setup_nmi();
 				enable_8259A_irq(0);


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/