Andrew Morton wrote:
> For uniprocessors this:
>
> const int cpu = smp_processor_id();
> if (dev->xmit_lock_owner != cpu) {
>
> generates faster code than this:
>
> int cpu = smp_processor_id();
> if (dev->xmit_lock_owner != cpu) {
That's really odd, I would have assumed that gcc would have optomized
the variable away, but your experiment indicates otherwise. Maybe we need
#ifdef CONFIG_SMP
typedef int processor_id_t;
#else
typedef const int processor_id_t;
#endif
-Mitch
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