Problem with dma_alloc_coherent at linux-2.6.33-arm1 , with RealView platform,board PBX-A9 and armv7 instructions.

[Russell King - ARM Linux]

Catalin, can you help with this please?

Thanks.

On Thu, Jul 15, 2010 at 07:16:24PM +0800, David Yang wrote:
> patch-6220/1   can't be  patched on kernel version linux-2.6.33-arm1.
> 
> the file arch/arm/mm/cache-l2x0.c  may be too old for the patch.
> 
> 
> On Thu, Jul 15, 2010 at 6:09 PM, Russell King - ARM Linux
> <linux at arm.linux.org.uk> wrote:
> > On Thu, Jul 15, 2010 at 03:34:58PM +0530, Shilimkar, Santosh wrote:
> >> > -----Original Message-----
> >> > From: linux-arm-kernel-bounces at lists.infradead.org [mailto:linux-arm-
> >> > kernel-bounces at lists.infradead.org] On Behalf Of David Yang
> >> > Sent: Thursday, July 15, 2010 3:27 PM
> >> > To: Russell King - ARM Linux
> >> > Cc: linux-arm-kernel at lists.infradead.org; Ben Dooks
> >> > Subject: Re: Problem with dma_alloc_coherent at linux-2.6.33-arm1 , with
> >> > RealView platform,board PBX-A9 and armv7 instructions.
> >> >
> >> > I have explicitly added the barrier() in my driver, but it did't work.
> >> >
> >> > I will go on testing until solve the problem. I need more advice.
> >> >
> >> The 'barrier()' is just a compiler barrier. You should be using "mb" "rmb"
> >> or "wmb"  depending on the usage.
> >
> > It'd be useful if the patches which are destined for mainline get some
> > independent testing by people who have experienced the problem, rather
> > than creating their own solutions.
> >
> > We can then have much more confidence in the patch which may eventually
> > be applied is solving problems people are seeing - and more importantly
> > identify any defficiencies in the patch so we don't have to repeatedly
> > patch the same area multiple times.
> >