On Sun, May 3, 2020 at 2:30 PM Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > > Quoting Jason A. Donenfeld (2020-04-30 23:10:16) > > Sometimes it's not okay to use SIMD registers, the conditions for which > > have changed subtly from kernel release to kernel release. Usually the > > pattern is to check for may_use_simd() and then fallback to using > > something slower in the unlikely case SIMD registers aren't available. > > So, this patch fixes up i915's accelerated memcpy routines to fallback > > to boring memcpy if may_use_simd() is false. > > > > Cc: stable@xxxxxxxxxxxxxxx > > The same argument as on the previous submission is that we return to the > caller if we can't use movntqda as their fallback path should be faster > than uncached memcpy. Oh, THAT's what you meant before. Okay, will follow up.
