linux-kernel - [PATCH v2] drm/r128: fix build for UML

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Date:   Mon, 11 Oct 2021 01:00:06 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        linux-um@...ts.infradead.org, Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v2] drm/r128: fix build for UML

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@...radead.org>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Cc: linux-um@...ts.infradead.org
Cc: Sam Ravnborg <sam@...nborg.org>
---
v2: update Fixes: tag (Johannes)
    Use simple CONFIG_X86 instead of a more complicated expression. (Sam)

 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();