Re: [RFC][PATCH] Avoid vmtruncate/mmap-page-fault race

[Hugh Dickins]

On Fri, 23 May 2003, Daniel Phillips wrote:
> On Friday 23 May 2003 18:21, Hugh Dickins wrote:
> > Sorry, I miss the point of this patch entirely.  At the moment it just
> > looks like an unattractive rearrangement - the code churn akpm advised
> > against - with no bearing on that vmtruncate race.  Please correct me.
> 
> This is all about supporting cross-host mmap (nice trick, huh?).  Yes, 
> somebody should post a detailed rfc on that subject.

Ah, thanks - translated into terms that I can understand, so that
some ->nopage() not yet in the tree could do something after the
install_new_page() returns.  Hmm.  Can we be sure it's appropriate
for install_new_page to drop mm->page_table_lock before it returns?

Hugh