lkml.org 
[lkml]   [2008]   [Jun]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc_short
Cliff Wickman wrote:
> From: Cliff Wickman <cpw@sgi.com>
>
> Provide atomic operations for increment of a 16-bit integer and
> logical OR into a 64-bit integer.
>
> [ This patch was split off of patch:
> SGI UV: TLB shootdown using broadcast assist unit
> and improved with advice from Jeremy Fitzhardinge <jeremy@goop.org> ]
>
> Diffed against 2.6.26-rc4
>
> Signed-off-by: Cliff Wickman <cpw@sgi.com>
>
Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org>

> ---
> include/asm-x86/atomic_64.h | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> Index: linux/include/asm-x86/atomic_64.h
> ===================================================================
> --- linux.orig/include/asm-x86/atomic_64.h
> +++ linux/include/asm-x86/atomic_64.h
> @@ -431,6 +431,32 @@ static inline int atomic64_add_unless(at
> return c != (u);
> }
>
> +/**
> + * atomic_inc_short - increment of a short integer
> + * @v: pointer to type int
> + *
> + * Atomically adds 1 to @v
> + * Returns the new value of @u
> + */
> +static inline short int atomic_inc_short(short int *v)
> +{
> + asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
> + return *v;
> +}
> +
> +/**
> + * atomic_or_long - OR of two long integers
> + * @v1: pointer to type unsigned long
> + * @v2: pointer to type unsigned long
> + *
> + * Atomically ORs @v1 and @v2
> + * Returns the result of the OR
> + */
> +static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
> +{
> + asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
> +}
> +
> #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
>
> /* These are x86-specific, used by some header files */
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>



\
 
 \ /
  Last update: 2008-06-05 17:31    [W:0.042 / U:1.596 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site