[RFC PATCH 06/15] Provide 16-bit ISO atomics
From: David Howells <dhowells@redhat.com>
Date: 2016-05-18 15:11:27
Also in:
lkml
Subsystem:
generic include/asm header files, the rest · Maintainers:
Arnd Bergmann, Linus Torvalds
Provide an implementation of atomic_inc_short() using ISO atomics. Signed-off-by: David Howells <dhowells@redhat.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@redhat.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 */