linux-kernel - [RFC PATCH 06/15] Provide 16-bit ISO atomics

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Message-ID: <146358428286.8596.2865175107430611616.stgit@warthog.procyon.org.uk>
Date:	Wed, 18 May 2016 16:11:22 +0100
From:	David Howells <dhowells@...hat.com>
To:	linux-arch@...r.kernel.org
Cc:	x86@...nel.org, will.deacon@....com, linux-kernel@...r.kernel.org,
	dhowells@...hat.com, ramana.radhakrishnan@....com,
	paulmck@...ux.vnet.ibm.com, dwmw2@...radead.org
Subject: [RFC PATCH 06/15] Provide 16-bit ISO atomics

Provide an implementation of atomic_inc_short() using ISO atomics.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/asm-generic/iso-atomic16.h |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 include/asm-generic/iso-atomic16.h

diff --git a/include/asm-generic/iso-atomic16.h b/include/asm-generic/iso-atomic16.h
new file mode 100644
index 000000000000..383baaae7208
--- /dev/null
+++ b/include/asm-generic/iso-atomic16.h
@@ -0,0 +1,27 @@
+/* Use ISO C++11 intrinsics to implement 16-bit atomic ops.
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@...hat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_GENERIC_ISO_ATOMIC16_H
+#define _ASM_GENERIC_ISO_ATOMIC16_H
+
+/**
+ * atomic_inc_short - increment of a short integer
+ * @v: pointer to type int
+ *
+ * Atomically adds 1 to @v
+ * Returns the new value of @v
+ */
+static __always_inline short int atomic_inc_short(short int *v)
+{
+	return __atomic_add_fetch(v, 1, __ATOMIC_SEQ_CST);
+}
+
+#endif /* _ASM_GENERIC_ISO_ATOMIC16_H */