Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

[Phillip Susi]

Alan Cox wrote:
> > Why do the two pages have to be physically contiguous?  The stack just 
> > needs to be two contiguous pages in virtual memory, but they can map to 
> > any two pages anywhere in physical memory.
>
> Historically we allowed DMA off the stack on old x86 systems. Removing
> that while a good idea would take a lot of auditing. We also have a very
> limited vmalloc window for mapped pages and filling that with stacks
> would be bad.

Wow, DMA off the stack?  That's just crazy.

-
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/