Re: [PATCH] page walker bugfix (was: 2.5.49-mm2)

[Andrew Morton <akpm@digeo.com>]

Ingo Oeser wrote:
> 
> Hi Andrew,
> hi list readers,
> 
> On Wed, Nov 27, 2002 at 01:11:38AM -0800, Andrew Morton wrote:
> > .. Some code from Ingo Oeser to start using the expanded and cleaned up
> >   user pagetable walker code.  This affects the st and sg drivers; I'm
> >   not sure of the testing status of this?
> 
> The testing status is: None, but it compiles.
> 
> The sg-driver maintainer has already said he does some testing
> and the author of the previous code in st.c was positive about
> using these features. That's why I've choosen these as my "victims".

Yes, Doug Gilbert will help us out here.

> I also found a locking bug in walk_user_pages() in case of OOM or
> SIGBUS. Fixed by the attached patch.
> 

Thanks.

We'll need to be concentrating on the shared pagetable code for
a while, and your patch overlaps with that.  So I've swapped the
applying order (you come second) and I'll probably break your
stuff out separately for a while so Dave can generate clean patches.

When mm3 emerges could you please check mm/mmap.c around here:

        vma = NULL; /* needed for out-label */

I may have misplaced that one...