XRay-aarch64-linux::patching-unpatching.cc test flaky

[Renato Golin via llvm-commits]

On 19 December 2016 at 19:10, Serge Rogatch <serge.rogatch at gmail.com> wrote:
> Is this possible that CPU cache stays so incoherent with the data cache?

Hi Serge,

Unlike Intel, the instruction cache and the data cache on ARM have
different update policies (ie. are not coherent). For self modifying
code you need to actively clear the cache (via __clear_cache).

Check this post:

https://www.community.arm.com/processors/b/blog/posts/caches-and-self-modifying-code

cheers,
--renato