[11u] RFR: JDK-8222286: Fix for JDK-8213419 is broken on s390

[Andrew Hughes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8222286
Webrev: https://cr.openjdk.java.net/~andrew/openjdk11/8222286/webrev.01/

On s390 (the 31-bit architecture), calls to log2_intptr with a size_t
argument are ambiguous, because there is log2_intptr(uintptr_t x) and
log2_intptr(intptr_t x). This is not a problem on other architectures
where size_t is the same as uintptr_t. See existing bugs for
more details of the s390 situation [0] [1] [2].

The issue can be resolved by explicitly casting to uintptr_t.

It is not applicable to >= 12u, as JDK-8213436 removed the problematic
function in which this occurs.

Ok for 11u?

[0] https://bugs.openjdk.java.net/browse/JDK-8203030
[1] https://bugs.openjdk.java.net/browse/JDK-8074459
[2] https://bugs.openjdk.java.net/browse/JDK-8046938

Thanks,
-- 
Andrew :)

Senior Free Java Software Engineer
OpenJDK Package Owner
Red Hat, Inc. (http://www.redhat.com)

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