[PATCH RFC] ARM: MPCore v6_early_abort enhancement

[George G. Davis]

Hi,

On Fri, Feb 11, 2011 at 10:38:44PM +0000, Russell King - ARM Linux wrote:
> On Sat, Feb 12, 2011 at 12:54:21AM +0300, Valentine Barshak wrote:
> > SWP instruction sets bit 11 in DFSR, in case of data fault on SMP MPCore.
> > So v6_early_abort doesn't need erratum 326103 workaround for MPCore.
> 
> NAK.  When building a SMP kernel which also supports v6 CPUs, this will
> cause v6 CPUs to break.

Since the SWP erratum only affects ARM1136 (UP) processors, how will this
break ARM11 MPCore (v6) processors?  Are you referring to unified kernels
which support both UP and SMP machines?  I reckon that's a recent feature
to be able to boot SMP kernels on UP machines.  Perhaps if that's
why you're against this, then we need to have a separate config
option to specifically enable this ARM1136 erratum workaround?  Or
at least only perform the workaround for certain processor IDs?

Thanks!

--
Regards,
George