> --- a/arch/x86/kernel/cpu/perf_event_msr.c
> +++ b/arch/x86/kernel/cpu/perf_event_msr.c
> @@ -163,10 +163,9 @@ again:
> goto again;
>
> delta = now - prev;
> - if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) {
> - delta <<= 32;
> - delta >>= 32; /* sign extend */
> - }
> + if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
> + delta = sign_extend64(delta, 31);
> +
> local64_add(now - prev, &event->count);
> }
GCC can figure it out wither way, but wouldn't
delta = (s32)delta;
be simpler than either?
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