RFA: 8211387: [Zero] atomic_copy64: Use ldrexd for atomic reads on ARMv7

[Rob McKenna]

Approved

    -Rob

On 09/10/18 11:25, Severin Gehwolf wrote:
> Hi,
> 
> Please approve this Zero JVM only change for 8u. It makes Zero use
> ldrexd for atomic reads on ARMv7. Since we build 8u Zero on ARM 32 in
> Fedora this is useful to us to get upstream. Patch is the same as for
> JDK 12, post path-unshuffeling.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8211387
> changeset: http://hg.openjdk.java.net/jdk/jdk/rev/6ee9500fe653
> 
> Testing: bootcyle-images Zero builds on ARMv7.
> 
> Thanks,
> Severin
>