[src/trunk]: src/sys/external/bsd/drm2/drm drm: Make drm_clflush_* noop on al...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/af891cd6320c
branches:  trunk
changeset: 368571:af891cd6320c
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Jul 19 23:19:27 2022 +0000

description:
drm: Make drm_clflush_* noop on alpha.

As far as I know there is no need for this; the CPU has weak ordering
on loads and stores requiring ordering barriers, but I/O devices
participate in the CPU's cache protocol for access to main memory so
there's never any need for explicit cache flushes.

diffstat:

 sys/external/bsd/drm2/drm/drm_cache.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r faeb76fa0fbf -r af891cd6320c sys/external/bsd/drm2/drm/drm_cache.c
--- a/sys/external/bsd/drm2/drm/drm_cache.c     Tue Jul 19 23:19:17 2022 +0000
+++ b/sys/external/bsd/drm2/drm/drm_cache.c     Tue Jul 19 23:19:27 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: drm_cache.c,v 1.18 2021/12/19 11:33:30 riastradh Exp $ */
+/*     $NetBSD: drm_cache.c,v 1.19 2022/07/19 23:19:27 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.18 2021/12/19 11:33:30 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.19 2022/07/19 23:19:27 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -43,7 +43,7 @@
 
 #include <drm/drm_cache.h>
 
-#if !defined(__arm__) && !defined(__aarch64__)
+#if !defined(__arm__) && !defined(__aarch64__) && !defined(__alpha__)
 #define DRM_CLFLUSH    1
 #endif