On Fri, Sep 28, 2007 at 11:45:26AM -0700, Andrew Morton wrote:
>
> > The virtual address space argument of clear_user_highpage is supposed to
> > be the virtual address where the page being cleared will eventually be
> > mapped. This allows architectures with virtually indexed caches a few
> > clever tricks. That sort of trick falls over in painful ways if the
> > virtual address argument is wrong.
>
> yeah, but only if you're using a weird CPU architecture ;)
I guess once I convinced your employer that weird CPU architectures
deliver more punch for the watt they stop being so weird ;-)
> >
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index 84c795e..eab8c42 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -42,7 +42,7 @@ static void clear_huge_page(struct page *page, unsigned
> > long addr)
> > might_sleep();
> > for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); i++) {
> > cond_resched();
> > - clear_user_highpage(page + i, addr);
> > + clear_user_highpage(page + i, addr + i * PAGE_SIZE);
> > }
> > }
> >
>
> I'll add this to the 2.6.23 queue. Is it needed in 2.6.22.x?
It's totally theoretical atm, MIPS doesn't support hugetlb and I'm not
even working on it. I just happened to spot the issue.
Ralf
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