[src/trunk]: src/sys/external/bsd/common/include/asm linux: Define mb/wmb/rmb...

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

details:   https://anonhg.NetBSD.org/src/rev/fa4189ed5343
branches:  trunk
changeset: 1029199:fa4189ed5343
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Dec 27 10:41:57 2021 +0000

description:
linux: Define mb/wmb/rmb as mfence/sfence/lfence on i386 too.

Not the same as membar_*; drm uses mb to order special instructions
like clflush which require mfence for ordering.

diffstat:

 sys/external/bsd/common/include/asm/barrier.h |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r 88084b89305d -r fa4189ed5343 sys/external/bsd/common/include/asm/barrier.h
--- a/sys/external/bsd/common/include/asm/barrier.h     Sun Dec 26 21:33:48 2021 +0000
+++ b/sys/external/bsd/common/include/asm/barrier.h     Mon Dec 27 10:41:57 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: barrier.h,v 1.11 2021/12/19 12:25:20 riastradh Exp $   */
+/*     $NetBSD: barrier.h,v 1.12 2021/12/27 10:41:57 riastradh Exp $   */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -46,7 +46,7 @@
 #define        mb()    __asm __volatile ("dsb sy" ::: "memory")
 #define        wmb()   __asm __volatile ("dsb st" ::: "memory")
 #define        rmb()   __asm __volatile ("dsb ld" ::: "memory")
-#elif defined(__x86_64__)
+#elif defined(__i386__) || defined(__x86_64__)
 #include <x86/cpufunc.h>
 #define        mb()    x86_mfence()
 #define        wmb()   x86_sfence()