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Implement fbdev emulation with fbdev-shmem. Avoids the overhead of fbdev-generic's additional shadow buffering. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Cc: Dave Airlie <airlied@redhat.com> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Jocelyn Falempe <jfalempe@redhat.com> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-13-tzimmermann@suse.de