[src/trunk]: src/sys/external/bsd/drm2/include/linux Linux clear_bit_unlock

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

details:   https://anonhg.NetBSD.org/src/rev/7bade696c64e
branches:  trunk
changeset: 1028433:7bade696c64e
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 11:02:38 2021 +0000

description:
Linux clear_bit_unlock

diffstat:

 sys/external/bsd/drm2/include/linux/atomic.h |  12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diffs (26 lines):

diff -r 308dbf7873fd -r 7bade696c64e sys/external/bsd/drm2/include/linux/atomic.h
--- a/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 11:02:30 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 11:02:38 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: atomic.h,v 1.31 2021/12/19 11:01:44 riastradh Exp $    */
+/*     $NetBSD: atomic.h,v 1.32 2021/12/19 11:02:38 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -475,6 +475,16 @@
 }
 
 static inline void
+clear_bit_unlock(unsigned int bit, volatile unsigned long *ptr)
+{
+       const unsigned int units = (sizeof(*ptr) * CHAR_BIT);
+
+       /* store-release */
+       smp_mb__before_atomic();
+       atomic_and_ulong(&ptr[bit / units], ~(1UL << (bit % units)));
+}
+
+static inline void
 change_bit(unsigned int bit, volatile unsigned long *ptr)
 {
        const unsigned int units = (sizeof(*ptr) * CHAR_BIT);