linux-kernel - Re: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc

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Date:	Thu, 05 Jun 2008 16:27:00 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Cliff Wickman <cpw@....com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc_short

Cliff Wickman wrote:
> From: Cliff Wickman <cpw@....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@...p.org> ]
>
> Diffed against 2.6.26-rc4
>
> Signed-off-by: Cliff Wickman <cpw@....com>
>   
Reviewed-by: Jeremy Fitzhardinge <jeremy@...p.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 */
> --
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