linux-kernel - Re: [PATCH] "volatile considered harmful" document

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Message-ID: <46479E95.6050507@tmr.com>
Date:	Sun, 13 May 2007 19:26:13 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] "volatile considered harmful" document

Krzysztof Halasa wrote:
> Robert Hancock <hancockr@...w.ca> writes:
>
>   
>> You don't need volatile in that case, rmb() can be used.
>>     
>
> rmb() invalidates all compiler assumptions, it can be much slower.
>   
Yes, why would you use rmb() when a read of a volatile generates optimal 
code?

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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