Re: [2.6 patch] i386: always use 4k stacks

[Zwane Mwaikambo]

On Thu, 15 Dec 2005, Adrian Bunk wrote:

> On Thu, Dec 15, 2005 at 02:00:13PM -0800, Andrew Morton wrote:
> 
> > Supporting 8k stacks is a small amount of code and nobody has seen a need
> > to make changes in there for quite a long time.  So there's little cost to
> > keeping the existing code.
> > 
> > And the existing code is useful:
> > 
> > a) people can enable it to confirm that their weird crash was due to a
> >    stack overflow.
> > 
> > b) If I was going to put together a maximally-stable kernel for a
> >    complex server machine, I'd select 8k stacks.  We're still just too
> >    squeezy, and we've had too many relatively-recent overflows, and there
> >    are still some really deep callpaths in there.
> 
> a1) People turn off 4k stacks and never report the problem / noone 
>     really debugs and fixes the reported problem.
> 
> Me threatening people with enabling 4k stacks for everyone already 
> resulted in several fixes.

How about this, we apply this patch and perhaps add some debug option to 
enable 8k by changing THREAD_SIZE. This way we have the seperate interrupt 
stacks and 8k stacks for when someone suspects a stack overflow.
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