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

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

details:   https://anonhg.NetBSD.org/src/rev/af80b80dea96
branches:  trunk
changeset: 1027990:af80b80dea96
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 01:25:50 2021 +0000

description:
raw_read_seqcount

diffstat:

 sys/external/bsd/drm2/include/linux/seqlock.h |  13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diffs (27 lines):

diff -r 831a90085e1a -r af80b80dea96 sys/external/bsd/drm2/include/linux/seqlock.h
--- a/sys/external/bsd/drm2/include/linux/seqlock.h     Sun Dec 19 01:25:42 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/seqlock.h     Sun Dec 19 01:25:50 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: seqlock.h,v 1.3 2021/12/19 01:21:30 riastradh Exp $    */
+/*     $NetBSD: seqlock.h,v 1.4 2021/12/19 01:25:50 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -117,6 +117,17 @@
        return __read_seqcount_retry(seqcount, gen);
 }
 
+static inline unsigned
+raw_read_seqcount(struct seqcount *seqcount)
+{
+       unsigned gen;
+
+       gen = seqcount->sqc_gen;
+       membar_consumer();
+
+       return gen;
+}
+
 struct seqlock {
        kmutex_t                sql_lock;
        struct seqcount         sql_count;