linux-kernel - Re: [PATCH] DOCUMENTATION: Fixed typo in an example in memory-barriers.txt

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Message-ID: <53F8D6DD.90306@infradead.org>
Date:	Sat, 23 Aug 2014 11:01:01 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Ganesh Rapolu <ganesh.rapolu@...mail.com>
CC:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] DOCUMENTATION: Fixed typo in an example in memory-barriers.txt

On 08/22/14 23:05, Ganesh Rapolu wrote:
> In the first example in the memory-barriers.txt file, CPU 2 is assigned to
> run (x = B; y = A;). However, the rest of the example proceeds as if CPU 2 had been
> running (x = A; y = B;) as shown by the descriptions of the possible executions:
> 
> 	STORE A=3,	STORE B=4,	x=LOAD A->3,	y=LOAD B->4
> 	STORE A=3,	STORE B=4,	y=LOAD B->4,	x=LOAD A->3
> 	STORE A=3,	x=LOAD A->3,	STORE B=4,	y=LOAD B->4
> 	STORE A=3,	x=LOAD A->3,	y=LOAD B->2,	STORE B=4
> 	STORE A=3,	y=LOAD B->2,	STORE B=4,	x=LOAD A->3
> 	STORE A=3,	y=LOAD B->2,	x=LOAD A->3,	STORE B=4
> 	STORE B=4,	STORE A=3,	x=LOAD A->3,	y=LOAD B->4
> 	STORE B=4, ...
> 	...
> 
> The change was merely to make the inital evironment consistent with what happens in the
> rest of the example.
> 
> Signed-off-by: Ganesh Rapolu <ganesh.rapolu@...mail.com>


Comments David, Alexey, Andrew, Paul?

This would revert Alexey's patch 615cc2c9cf9529846fbc342560d6787c2ccaaeea:
"Documentation/memory-barriers.txt: fix important typo re memory barriers"
that was merged on June 6, 2014.

Thanks.


> ---
>  Documentation/memory-barriers.txt | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
> index a4de88f..9a46bbe 100644
> --- a/Documentation/memory-barriers.txt
> +++ b/Documentation/memory-barriers.txt
> @@ -115,8 +115,8 @@ For example, consider the following sequence of events:
>  	CPU 1		CPU 2
>  	===============	===============
>  	{ A == 1; B == 2 }
> -	A = 3;		x = B;
> -	B = 4;		y = A;
> +	A = 3;		x = A;
> +	B = 4;		y = B;
>  
>  The set of accesses as seen by the memory system in the middle can be arranged
>  in 24 different combinations:
> 


-- 
~Randy
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