Messages in this thread | | | From | "Jason A. Donenfeld" <> | Date | Sun, 3 May 2020 14:35:03 -0600 | Subject | Re: [PATCH] drm/i915: check to see if SIMD registers are available before using SIMD |
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On Sun, May 3, 2020 at 2:30 PM Chris Wilson <chris@chris-wilson.co.uk> 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@vger.kernel.org > > 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.
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