On Wed, Jun 07, 2017 at 02:06:13PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 06, 2017 at 04:00:03PM -0700, Palmer Dabbelt wrote:
> > +static inline int atomic_fetch_sub(unsigned int mask, atomic_t *v)
> > +{
> > + int out;
> > +
> > + __asm__ __volatile__ (
> > + "amosub.w %2, %1, %0"
> > + : "+A" (v->counter), "=r" (out)
> > + : "r" (mask));
> > + return out;
> > +}
Your instruction manual does not list AMOSUB as a valid instruction. So
either it is wrong or this code never compiled. Please clarify.
