> -----Original Message-----
> From: Hillf Danton [mailto:[email protected]]
> Sent: Monday, December 08, 2014 5:33 PM
> To: Wang, Yalin
> Cc: linux-kernel; [email protected]; [email protected];
> Andrew Morton; Hillf Danton
> Subject: Re: [PATCH] mm:add VM_BUG_ON() for page_mapcount()
>
> >
> > This patch add VM_BUG_ON() for slab page, because _mapcount is an
> > union with slab struct in struct page, avoid access _mapcount if this
> > page is a slab page.
> > Also remove the unneeded bracket.
> >
> > Signed-off-by: Yalin Wang <[email protected]>
> > ---
> > include/linux/mm.h | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/linux/mm.h b/include/linux/mm.h index
> > 11b65cf..34124c4 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -373,7 +373,8 @@ static inline void reset_page_mapcount(struct page
> > *page)
> >
> > static inline int page_mapcount(struct page *page) {
> > - return atomic_read(&(page)->_mapcount) + 1;
> > + VM_BUG_ON(PageSlab(page));
>
> s/ VM_BUG_ON/ VM_BUG_ON_PAGE/ ?
Yes, I will send again .
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