Re: Creating a per-task kernel space for kmap, user pagetables, et al

Andrea Arcangeli
2002-03-21T23:30:25Z

On Thu, Mar 21, 2002 at 11:54:51AM -0800, Greg KH wrote:
> On Wed, Mar 20, 2002 at 11:00:02PM +0100, Andrea Arcangeli wrote:
> > But it is much faster to keep the kernel stack always in 4M global
> > tlbs, thus I don't think we need to change that in 2.5. (also USB was
> > used to do dma in the kernel stack, not sure if they changed it
> > recently)
>
> Hopefully all instances of the USB code doing that have now been fixed.
> If anyone sees any USB code that uses the kernel stack for USB
> transfers, please let me know so it can be fixed.
>
> We (the USB group) have always known that this is a bug in our code, so
> don't feel you can't change things just because the USB code might be
> broken by it :)

Glad to hear, thanks!

Andrea