"Will Deacon" <will.dea...@arm.com> wrote on 02/16/2011 01:07:09 PM:
> > I've now built a kernel with CONFIG_ARM_ERRATA_720789 enabled, and the
> > symptoms indeed seem to have disappeared completely ...
>
> Yup - that's because without it, invalidating a TLB entry for a
particular
> process isn't broadcast correctly, so you can end up using the old
(pre-COW)
> mappings if you're running on a different core.
OK. So I guess the only remaining questions is: if this hardware needs the
errata fix to work properly, shouldn't it be automatically selected by the
kernel configure logic? Note that this appears to happen for certain OMAP
boards, see arch/arm/mach-omap2/Kconfig:
config ARCH_OMAP4
bool "TI OMAP4"
default y
depends on ARCH_OMAP2PLUS
select CPU_V7
select ARM_GIC
select PL310_ERRATA_588369
select ARM_ERRATA_720789 <<=====
select USB_ARCH_HAS_EHCI
But this does not happen for the vexpress; arch/arm/mach-vexpress/Kconfig
has only:
config ARCH_VEXPRESS_CA9X4
bool "Versatile Express Cortex-A9x4 tile"
select CPU_V7
select ARM_GIC
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
Dr. Ulrich Weigand | Phone: +49-7031/16-3727
STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E.
IBM Deutschland Research & Development GmbH
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