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[ Upstream commitd99004d720] I. was. blind. Caught with vkms, which has some really slow crc computation function. Fixes:1882018a70("drm/crc-debugfs: User irqsafe spinlock in drm_crtc_add_crc_entry") Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> Cc: Emil Velikov <emil.velikov@collabora.com> Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190606211544.5389-1-daniel.vetter@ffwll.ch Signed-off-by: Sasha Levin <sashal@kernel.org>