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From: Marius Strobl <marius@FreeBSD.org>
Date: Tue, 7 Aug 2018 18:56:01 +0000 (UTC)
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Subject: svn commit: r337432 - head/sys/arm/include
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Author: marius
Date: Tue Aug  7 18:56:01 2018
New Revision: 337432
URL: https://svnweb.freebsd.org/changeset/base/337432

Log:
  Implement atomic_swap_64(9).

Modified:
  head/sys/arm/include/atomic-v4.h

Modified: head/sys/arm/include/atomic-v4.h
==============================================================================
--- head/sys/arm/include/atomic-v4.h	Tue Aug  7 18:29:10 2018	(r337431)
+++ head/sys/arm/include/atomic-v4.h	Tue Aug  7 18:56:01 2018	(r337432)
@@ -249,6 +249,19 @@ atomic_subtract_64(volatile u_int64_t *p, u_int64_t va
 	__with_interrupts_disabled(*p -= val);
 }
 
+static __inline uint64_t
+atomic_swap_64(volatile uint64_t *p, uint64_t v)
+{
+	uint64_t value;
+
+	__with_interrupts_disabled(
+	{
+		value = *p;
+		*p = v;
+	});
+	return (value);
+}
+
 #else /* !_KERNEL */
 
 static __inline void