lkml.org 
[lkml]   [2006]   [Jun]   [7]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateWed, 7 Jun 2006 15:21:55 +0200
FromIngo Molnar <>
SubjectRe: mutex vs. local irqs (Was: 2.6.18 -mm merge plans)
* Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> during boot). In addition to that, archs need to add something to their
> actual interrupt entry:
> 
> 	if (no_irq_boot) {
> 		local_irq_disable();
> 		return;
> 	}

that just moves the suckage from the mutex-debugging slowpath to the 
irq-handling hotpath. (at which point i still prefer to have that in the 
mutex-debugging path)

a better solution would be to install boot-time IRQ vectors that just do
nothing but return. They dont mask, they dont ACK nor EOI - they just
return. The only thing that could break this is a screaming interrupt,
and even that one probably just slows things down a tiny bit until we
get so far in the init sequence to set up the PIC.

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

\
 
 \ /
  Last update: 2006-06-07 15:25    [from the cache]
©2003-2008