linux-kernel - Re: [PATCH] Docs: this_cpu_ops: remove redundant add forms

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Date:	Thu, 25 Sep 2014 10:18:32 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
CC:	Pranith Kumar <bobby.prani@...il.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH] Docs: this_cpu_ops: remove redundant add forms

On 09/24/14 06:49, Mark Rutland wrote:
> Hi,
> 
> I spotted the below while trying to figure out how to use this_cpu ops,
> and it left me confused for a short while.
> 
> I guess that this is a refactoring fallout rather than there being a
> special this_cpu_add variant?
> 
> Mark.
> 
> ---->8----
> Commit ac490f4dca94 (Documentation: this_cpu_ops.txt: Update description
> of this_cpu_ops) added lists of {__,}this_cpu operations, but these have
> duplicate, parameter-less entries for {__,}this_cpu_add which don't
> correspond to any implementation. No other operations have such
> duplicate entries.
> 
> Given both are also listed with their full complement of arguments, the
> empty forms are redundant and can be removed. This patch performs said
> removal.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Pranith Kumar <bobby.prani@...il.com>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> ---
>  Documentation/this_cpu_ops.txt | 2 --
>  1 file changed, 2 deletions(-)


Applied, thanks.

> diff --git a/Documentation/this_cpu_ops.txt b/Documentation/this_cpu_ops.txt
> index 0ec9957..2cbf719 100644
> --- a/Documentation/this_cpu_ops.txt
> +++ b/Documentation/this_cpu_ops.txt
> @@ -41,7 +41,6 @@ The following this_cpu() operations with implied preemption protection
>  are defined. These operations can be used without worrying about
>  preemption and interrupts.
>  
> -	this_cpu_add()
>  	this_cpu_read(pcp)
>  	this_cpu_write(pcp, val)
>  	this_cpu_add(pcp, val)
> @@ -225,7 +224,6 @@ still occur while an operation is in progress and if the interrupt too
>  modifies the variable, then RMW actions can not be guaranteed to be
>  safe.
>  
> -	__this_cpu_add()
>  	__this_cpu_read(pcp)
>  	__this_cpu_write(pcp, val)
>  	__this_cpu_add(pcp, val)
> 


-- 
~Randy
--
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