linux-kernel - Re: [PATCH 01/02] remove set_wmb

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Message-ID: <20060715022233.GA1578@parisc-linux.org>
Date:	Fri, 14 Jul 2006 20:22:33 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>,
	mingo@...e.hu, linux-arch@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/02] remove set_wmb - doc update

On Fri, Jul 14, 2006 at 04:05:01PM -0400, Steven Rostedt wrote:
>  There are some more advanced barrier functions:
>  
>   (*) set_mb(var, value)
> - (*) set_wmb(var, value)
>  
> -     These assign the value to the variable and then insert at least a write
> -     barrier after it, depending on the function.  They aren't guaranteed to
> +     This assigns the value to the variable and then inserts at least a write
> +     barrier after it, depending on the function.  It isn't guaranteed to
>       insert anything more than a compiler barrier in a UP compilation.

"There is one more advanced barrier function"?  ;-)  Or did you want to
remove set_mb()?

Plus, the "depending on the function" bit means "respectively".  So what
you really want as help is something like:

	This assigns the value to the variable and then inserts a
	barrier after the assignment.  It isn't guaranteed to insert
	anything more than a compiler barrier in a UP compilation.
-
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