Quoting Jani Nikula (2020-11-12 11:44:37)
> Remove the last I915_WRITE() use in i915_debugfs.c.
> 
> Signed-off-by: Jani Nikula <[email protected]>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c 
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 7cbca268cb61..151734a1a496 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1562,13 +1562,9 @@ i915_cache_sharing_set(void *data, u64 val)
>         drm_dbg(&dev_priv->drm,
>                 "Manually setting uncore sharing to %llu\n", val);
>         with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
> -               u32 snpcr;
> -
>                 /* Update the cache sharing policy here as well */
> -               snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
> -               snpcr &= ~GEN6_MBC_SNPCR_MASK;
> -               snpcr |= val << GEN6_MBC_SNPCR_SHIFT;
> -               I915_WRITE(GEN6_MBCUNIT_SNPCR, snpcr);
> +               intel_uncore_rmw(&dev_priv->uncore, GEN6_MBCUNIT_SNPCR,
> +                                GEN6_MBC_SNPCR_MASK, val << 
> GEN6_MBC_SNPCR_SHIFT);
>         }

Remove the braces, or remove the entire i915_cache_sharing file. A debug
interface with no validation or user.
-Chris
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