I wonder if 2.6.17 will be the end of these firmware / SMP
problems... I noticed this commit in the ChangeLog for kernel 2.6.17-rc1
commit 501f2499b897ca4be68b1acc7a4bc8cf66f5fd24
Author: Bryan Holty <[EMAIL PROTECTED]>
Date: Sat Mar 25 03:07:37 2006 -0800
[PATCH] IRQ: prevent enabling of previously disabled interrupt
This fix prevents re-disabling and enabling of a previously
disabled
interrupt. On an SMP system with irq balancing enabled; If an
interrupt is
disabled from within its own interrupt context with
disable_irq_nosync and is
also earmarked for processor migration, the interrupt is blindly
moved to the
other processor and enabled without regard for its current
"enabled" state.
If there is an interrupt pending, it will unexpectedly invoke
the irq handler
on the new irq owning processor (even though the irq was
previously disabled)
The more intuitive fix would be to invoke disable_irq_nosync and
enable_irq, but since we already have the desc->lock from
__do_IRQ, we
cannot call them directly. Instead we can use the same logic to
disable
and enable found in disable_irq_nosync and enable_irq, with
regards to the
desc->depth.
This now prevents a disabled interrupt from being re-disabled,
and more
importantly prevents a disabled interrupt from being incorrectly
enabled on
a different processor.
Signed-off-by: Bryan Holty <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Cc: "Luck, Tony" <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
- Rick
On Apr 5, 2006, at 4:20 PM, Ricardo Lugo wrote:
> Wilhelm,
>
> I believe it's under Processor type and features as "Enable kernel
> irq balancing."
>
> - Rick
>
> On Apr 4, 2006, at 2:40 AM, Wilhelm Eger wrote:
>
>> Hello,
>>
>>> 1) recompile the kernel without IRQ Balancing
>>
>> I can't find such an option in my 2.6.16 menuconfig. Could you give
>> me a
>> hint?
>>
>> Regards,
>>
>> Wilhelm
>>
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>
>
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