linux-kernel - Re: why are some atomic_t's not volatile, while most are?

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Date:	Mon, 6 Aug 2007 12:35:51 +0800
From:	Jerry Jiang <wjiang@...ilience.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: why are some atomic_t's not volatile, while most are?

Is there some feedback on this point ?

Thank you
./Jerry

On Sun, 1 Jul 2007 08:49:37 -0400 (EDT)
"Robert P. J. Day" <rpjday@...dspring.com> wrote:

> 
>   prompted by the earlier post on "volatile"s, is there a reason that
> most atomic_t typedefs use volatile int's, while the rest don't?
> 
> $ grep "typedef.*struct"  $(find . -name atomic.h)
> ./include/asm-v850/atomic.h:typedef struct { int counter; } atomic_t;
> ./include/asm-mips/atomic.h:typedef struct { volatile int counter; } atomic_t;
> ./include/asm-mips/atomic.h:typedef struct { volatile long counter; } atomic64_t;
> ...
> 
>   etc, etc.  just curious.
> 
> rday
> -- 
> ========================================================================
> Robert P. J. Day
> Linux Consulting, Training and Annoying Kernel Pedantry
> Waterloo, Ontario, CANADA
> 
> http://fsdev.net/wiki/index.php?title=Main_Page
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