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SubjectRe: [PATCH] make atomic_t volatile on all architectures
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;
/* now var can have any value. */

blue skies,

"Reality continues to ruin my life." - Calvin.

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