On Mon, Sep 08, 2014 at 12:13:16AM -0700, Hugh Dickins wrote:
> > > One subtlety to take care over: it's a long time since I've had to
> > > worry about pmd folding and pud folding (what happens when you only
> > > have 2 or 3 levels of page table instead of the full 4): macros get
> > > defined to
On Mon, 8 Sep 2014, Naoya Horiguchi wrote:
> On Mon, Sep 08, 2014 at 12:13:16AM -0700, Hugh Dickins wrote:
> > On Fri, 5 Sep 2014, Naoya Horiguchi wrote:
> > > On Wed, Sep 03, 2014 at 02:17:41PM -0700, Hugh Dickins wrote:
> > >
> > > > One subtlety to take care over: it's a long time since I've ha
On Mon, Sep 08, 2014 at 12:13:16AM -0700, Hugh Dickins wrote:
> On Fri, 5 Sep 2014, Naoya Horiguchi wrote:
> > On Wed, Sep 03, 2014 at 02:17:41PM -0700, Hugh Dickins wrote:
> > > On Thu, 28 Aug 2014, Naoya Horiguchi wrote:
> > > >
> > > > Reported-by: Hugh Dickins
> > > > Signed-off-by: Naoya Hor
On Fri, 5 Sep 2014, Naoya Horiguchi wrote:
> On Wed, Sep 03, 2014 at 02:17:41PM -0700, Hugh Dickins wrote:
> > On Thu, 28 Aug 2014, Naoya Horiguchi wrote:
> > >
> > > Reported-by: Hugh Dickins
> > > Signed-off-by: Naoya Horiguchi
> > > Cc: # [3.12+]
> >
> > No ack to this one yet, I'm afraid.
Hi Hugh,
Thank you very much for you close looking and valuable comments.
And I can't help feeling shame on many mistakes/misunderstandings
and lack of thoughts throughout the patchset.
I promise that all these will be fixed in the next version.
On Wed, Sep 03, 2014 at 02:17:41PM -0700, Hugh Dick
On Thu, 28 Aug 2014, Naoya Horiguchi wrote:
> We have a race condition between move_pages() and freeing hugepages,
> where move_pages() calls follow_page(FOLL_GET) for hugepages internally
> and tries to get its refcount without preventing concurrent freeing.
> This race crashes the kernel, so thi
We have a race condition between move_pages() and freeing hugepages,
where move_pages() calls follow_page(FOLL_GET) for hugepages internally
and tries to get its refcount without preventing concurrent freeing.
This race crashes the kernel, so this patch fixes it by moving FOLL_GET
code for hugepage
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