RFR: JDK-8307810: Consistently use LockingMode instead of UseHeavyMonitors

[Matthias Baesken]

On Wed, 10 May 2023 12:40:04 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> [JDK-8291555](https://bugs.openjdk.org/browse/JDK-8291555) phased out UseHeavyMonitors in favor of LockingMode=0. We forgot to apply these changes to PPC and S390. 
>> 
>> Since UseHeavyMonitors implies LockingMode, but not vice versa, we now have a mismatch if JVM is started with LockingMode=0 but without UseHeavyMonitors. That leads to crashes.
>> 
>> The patch fixes that, and in addition makes sure that if LockingMode=0 is set, we are setting UseHeavyMonitors too.
>
> Looks like the build fails now in arguments.cpp  on a few platforms.

> @MBaesken does that include s390x ?

I referred to the github action builds above. I think there was no linux s390x build included in those.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/13900#issuecomment-1542182896