Re: [PATCH] drm/r128: fix build for UML

On Wed, 2021-09-01 at 19:17 -0700, Randy Dunlap wrote:

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: 1da177e4c3f4 ("Linux-2.6.12-rc2") # pre-git

Arguably, that could be

Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")

because prior to that, Kconfig options depending on PCI couldn't be selected on ARCH=um.

johannes