Re: [PATCH v2] sata_sil24: Use memory barriers before issuing commands

FUJITA Tomonori
2010-06-14T00:36:56Z

On Fri, 11 Jun 2010 10:41:46 +0100
Catalin Marinas <catalin.marinas@arm.com> wrote:

> On Fri, 2010-06-11 at 02:38 +0100, Nick Piggin wrote:
> > On Thu, Jun 10, 2010 at 06:43:03PM -0600, Robert Hancock wrote:
> > > IMHO, it would be better for the platform code to ensure that MMIO
> > > access was strongly ordered with respect to each other and to RAM
> > > access. Drivers are just too likely to get this wrong, especially
> > > when x86, the most tested platform, doesn't have such issues.
> >
> > The plan is to make all platforms do this. writes should be
> > strongly ordered with memory. That serves to keep them inside
> > critical sections as well.
>
> Are there any public references to this discussion? Maybe a
> Documentation/ file (or update the memory-barriers.txt one would be
> useful).

I guess,