[src/trunk]: src/common/lib/libc/arch/aarch64/atomic Remove memory barriers f...

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

details:   https://anonhg.NetBSD.org/src/rev/80b9fce5f5d1
branches:  trunk
changeset: 1015097:80b9fce5f5d1
user:      skrll <skrll%NetBSD.org@localhost>
date:      Tue Oct 13 21:17:35 2020 +0000

description:
Remove memory barriers from the atomic ops macros in the same way as was
done for the other atomic ops earlier.

diffstat:

 common/lib/libc/arch/aarch64/atomic/atomic_op_asm.h |  10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)

diffs (73 lines):

diff -r 3c6f92e02d93 -r 80b9fce5f5d1 common/lib/libc/arch/aarch64/atomic/atomic_op_asm.h
--- a/common/lib/libc/arch/aarch64/atomic/atomic_op_asm.h       Tue Oct 13 21:06:18 2020 +0000
+++ b/common/lib/libc/arch/aarch64/atomic/atomic_op_asm.h       Tue Oct 13 21:17:35 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: atomic_op_asm.h,v 1.4 2020/10/07 07:34:29 skrll Exp $ */
+/* $NetBSD: atomic_op_asm.h,v 1.5 2020/10/13 21:17:35 skrll Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -41,7 +41,6 @@
        INSN    w2, w0, w1              /* calculate new value */       ;\
        stxrb   w3, w2, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     st                                                      ;\
        ret                             /* return old value */          ;\
 END(_atomic_##OP##_8)
 
@@ -52,7 +51,6 @@
        INSN    w0, w0, w1              /* calc new (return) value */   ;\
        stxrb   w3, w0, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     sy                                                      ;\
        ret                             /* return new value */          ;\
 END(_atomic_##OP##_8_nv)
 
@@ -63,7 +61,6 @@
        INSN    w2, w0, w1              /* calculate new value */       ;\
        stxrh   w3, w2, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     st                                                      ;\
        ret                             /* return old value */          ;\
 END(_atomic_##OP##_16)
 
@@ -74,7 +71,6 @@
        INSN    w0, w0, w1              /* calc new (return) value */   ;\
        stxrh   w3, w0, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     sy                                                      ;\
        ret                             /* return new value */          ;\
 END(_atomic_##OP##_16_nv)
 
@@ -85,7 +81,6 @@
        INSN    w2, w0, w1              /* calculate new value */       ;\
        stxr    w3, w2, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     st                                                      ;\
        ret                             /* return old value */          ;\
 END(_atomic_##OP##_32)
 
@@ -96,7 +91,6 @@
        INSN    w0, w0, w1              /* calc new (return) value */   ;\
        stxr    w3, w0, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again? */ ;\
-       dmb     sy                                                      ;\
        ret                             /* return new value */          ;\
 END(_atomic_##OP##_32_nv)
 
@@ -107,7 +101,6 @@
        INSN    x2, x0, x1              /* calculate new value */       ;\
        stxr    w3, x2, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again */  ;\
-       dmb     st                                                      ;\
        ret                             /* return old value */          ;\
 END(_atomic_##OP##_64)
 
@@ -118,7 +111,6 @@
        INSN    x0, x0, x1              /* calc new (return) value */   ;\
        stxr    w3, x0, [x4]            /* try to store */              ;\
        cbnz    w3, 1b                  /*   succeed? no, try again? */ ;\
-       dmb     sy                                                      ;\
        ret                             /* return new value */          ;\
 END(_atomic_##OP##_64_nv)