[PATCH] [AArch64] Add workaround for Cortex-A53 erratum (835769)

[Renato Golin]

On 10 October 2014 19:34, Tim Northover <t.p.northover at gmail.com> wrote:
> I'm not sure that would actually help much. If most systems are
> A57+A53, then the usual option is probably "-mcpu=cortex-a57". An
> alternative might be a "cortex-a53-r0p0" CPU or something; that would
> only help if we actually documented the CPUs supported of course.

With big-little, any affected A53 will need it, even if the code also
runs on an A57. If we do enable it by default on A53, we'll have to do
the same on A57.


> How widely deployed are these problematic CPUs likely to be?

And how much compile time increases? And what's the effect on benchmarks?

Until we have answers to those questions, I think a flag is probably
the best option.

--renato