On Sat, Jul 21, 2007 at 03:09:41PM -0700, H. Peter Anvin wrote:
> Muli Ben-Yehuda wrote:
> >
> > Ok, let's try again:
> >
> > You're changing this (pageattr.c)
> >
> > asm volatile("clflush (%0)" :: "r" (adr + i));
> >
> > into this:
> >
> > asm volatile("clflush %0" : "+m" (*(char __force*)(adr + i)));
> >
> > The original one calls clflush with (adr + i), the new one with (*(adr
> > + i)). Are these calls equivalent?
>
> Yes, they are. The parentheses which are part of the old assembly
> string has the same effect as the asterisk operator in C.
Ah, I see. Thanks for the explanation!
Cheers,
Muli
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