Re: [PATCH] doc: volatile considered evil

David Rientjes
2007-05-09T00:06:50Z

On Tue, 8 May 2007, Randy Dunlap wrote:

> From: Randy Dunlap <randy.dunlap@oracle.com>
>
> Add information on the problems with the C-language "volatile" keyword
> and why it should not be used (most of the time).
>
> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
> ---
> Documentation/volatile-usage.txt | 129 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 129 insertions(+)
>
> --- /dev/null
> +++ linux-2.6.21-git10/Documentation/volatile-usage.txt
> @@ -0,0 +1,129 @@
> +***** "volatile" considered useless and evil: Just Say NO! *****
> +
> +Do not use the C-language "volatile" keyword
> +(extracted from lkml emails from Linus)
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +

Again, please change this sweeping introduction to explicitly state that
Linus' emails were a criticism of using 'volatile' for objects (he refers
to them as "data structures") and can be appropriate for asm constructs.