On Thu, 2007-08-09 at 13:36 -0400, Chuck Ebbert wrote:
> > Fair enough. Casting to (volatile int *) will give us the behavior
> > people expect when using atomic_t without needing to use inefficient
> > barriers.
> >
>
> You can use this forget() macro to make the compiler reread a
> variable:
>
> #define forget(var) asm volatile ("" : "=m"(var))
You need to specify a "m"(var) input constraint as well. Without it the
compiler might remove the initialization of var. E.g.
void fn(void)
{
int var = 0;
forget(var);
/* now var can have any value. */
}
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
