[src/trunk]: src/sys/external/bsd/drm2/linux linux: Add clear_and_wake_up_bit.

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

details:   https://anonhg.NetBSD.org/src/rev/ae75abec6fef
branches:  trunk
changeset: 1028611:ae75abec6fef
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 11:26:50 2021 +0000

description:
linux: Add clear_and_wake_up_bit.

diffstat:

 sys/external/bsd/drm2/include/linux/wait_bit.h |   4 +++-
 sys/external/bsd/drm2/linux/linux_wait_bit.c   |  15 +++++++++++++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diffs (61 lines):

diff -r 8f25ec4f3dbe -r ae75abec6fef sys/external/bsd/drm2/include/linux/wait_bit.h
--- a/sys/external/bsd/drm2/include/linux/wait_bit.h    Sun Dec 19 11:26:42 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/wait_bit.h    Sun Dec 19 11:26:50 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wait_bit.h,v 1.2 2021/12/19 01:42:01 riastradh Exp $   */
+/*     $NetBSD: wait_bit.h,v 1.3 2021/12/19 11:26:50 riastradh Exp $   */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -32,6 +32,7 @@
 #ifndef        _LINUX_WAIT_BIT_H_
 #define        _LINUX_WAIT_BIT_H_
 
+#define        clear_and_wake_up_bit   linux_clear_and_wake_up_bit
 #define        wait_on_bit             linux_wait_on_bit
 #define        wait_on_bit_timeout     linux_wait_on_bit_timeout
 #define        wake_up_bit             linux_wake_up_bit
@@ -40,6 +41,7 @@
 void   linux_wait_bit_fini(void);
 
 void   wake_up_bit(const volatile unsigned long *, unsigned);
+void   clear_and_wake_up_bit(int, volatile unsigned long *);
 int    wait_on_bit(const volatile unsigned long *, unsigned, int);
 int    wait_on_bit_timeout(const volatile unsigned long *, unsigned, int,
            unsigned long);
diff -r 8f25ec4f3dbe -r ae75abec6fef sys/external/bsd/drm2/linux/linux_wait_bit.c
--- a/sys/external/bsd/drm2/linux/linux_wait_bit.c      Sun Dec 19 11:26:42 2021 +0000
+++ b/sys/external/bsd/drm2/linux/linux_wait_bit.c      Sun Dec 19 11:26:50 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: linux_wait_bit.c,v 1.3 2021/12/19 01:42:02 riastradh Exp $     */
+/*     $NetBSD: linux_wait_bit.c,v 1.4 2021/12/19 11:26:50 riastradh Exp $     */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_wait_bit.c,v 1.3 2021/12/19 01:42:02 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_wait_bit.c,v 1.4 2021/12/19 11:26:50 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -114,6 +114,17 @@
        wait_bit_exit(wbe);
 }
 
+void
+clear_and_wake_up_bit(int bit, volatile unsigned long *bitmap)
+{
+       struct waitbitentry *wbe;
+
+       wbe = wait_bit_enter(bitmap, bit);
+       clear_bit(bit, bitmap);
+       cv_broadcast(&wbe->cv);
+       wait_bit_exit(wbe);
+}
+
 int
 wait_on_bit(const volatile unsigned long *bitmap, unsigned bit, int flags)
 {