Fix a build error on CONFIG_UML, which does not support (provide) wbinvd(). UML can use the generic mb() instead. ../drivers/gpu/drm/r128/ati_pcigart.c: In function ‘drm_ati_pcigart_init’: ../drivers/gpu/drm/r128/ati_pcigart.c:218:2: error: implicit declaration of function ‘wbinvd’ [-Werror=implicit-function-declaration] wbinvd(); ^~~~~~ Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: David Airlie <airlied@xxxxxxxx> Cc: Daniel Vetter <daniel@xxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: Jeff Dike <jdike@xxxxxxxxxxx> Cc: Richard Weinberger <richard@xxxxxx> Cc: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx> Cc: linux-um@xxxxxxxxxxxxxxxxxxx --- v2: update Fixes: tag (thanks, Johannes) drivers/gpu/drm/r128/ati_pcigart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- linux-next-20211007.orig/drivers/gpu/drm/r128/ati_pcigart.c +++ linux-next-20211007/drivers/gpu/drm/r128/ati_pcigart.c @@ -215,7 +215,7 @@ int drm_ati_pcigart_init(struct drm_devi } ret = 0; -#if defined(__i386__) || defined(__x86_64__) +#if (defined(__i386__) || defined(__x86_64__)) && !defined(CONFIG_UML) wbinvd(); #else mb();