Subject: Re: Inline Assembly queries

From: Benjamin Herrenschmidt <[email-masked]>
Date: Tue, 30 Jun 2009 20:43:03 +1000

On Mon, 2009-06-29 at 16:57 +0100, David Howells wrote:
> kernel mailz <[email-masked]> wrote:
> 
> > asm("sync");
> 
> Isn't gcc free to discard this as it has no dependencies, no indicated side
> effects, and isn't required to be kept?  I think this should probably be:
> 
> 	asm volatile("sync");

It should also have a "memory" clobber or it's pointless since gcc would
otherwise be free to move load and stores accross that barrier.

Cheers,
Ben.