On 10/11/21 1:00 AM, 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: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
Signed-off-by: Randy Dunlap <rdun...@infradead.org>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: Jeff Dike <jd...@addtoit.com>
Cc: Richard Weinberger <rich...@nod.at>
Cc: Anton Ivanov <anton.iva...@cambridgegreys.com>
Cc: linux...@lists.infradead.org
Cc: Sam Ravnborg <s...@ravnborg.org>
---
v2: update Fixes: tag (Johannes)
     Use simple CONFIG_X86 instead of a more complicated expression. (Sam)


Oops, apparently I can't count and this is v3... :(

  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__)
+#ifdef CONFIG_X86
        wbinvd();
  #else
        mb();



--
~Randy

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