Re: x86-cache-pollution-aware-__copy_from_user_ll.patch added to-mm tree

[Hiro Yoshioka]

From: Andrew Morton <akpm@xxxxxxxx>

> Dave Jones <davej@xxxxxxxxxx> wrote:
> >
> > On Sun, Sep 04, 2005 at 01:16:00PM -0700, Andrew Morton wrote:
> >   >  unsigned long __copy_to_user_ll(void __user *to, const void *from, unsigned long n)
> >   >  {
> >   >  	BUG_ON((long) n < 0);
> > 
> >  Ehh? It's unsigned. This will never be true.
> 
> It's cast to long, so it'll trap if we try to copy >=2G.
> 
> It seems a strange thing to check though.   Do we really need it?

I don't know. I've just cut&paste the original __copy_from_user_ll()

Regards,
  Hiro
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