RFR: 8268014: Build failure on SUSE Linux Enterprise Server 11.4 (s390x) due to 'SYS_get_mempolicy' was not declared [v4]

[Martin Doerr]

On Wed, 2 Jun 2021 11:28:46 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review the patch which fixes the build failure on SUSE Linux Enterprise Server 11.4 (s390x).
>> 
>> @dholmes-ora had reminded me of this bug in [1].
>> But I missed the fact that ZGC is currently only built on x64 and aarch64.
>> And I'm sorry for this breakage.
>> 
>> The sys_call numbers of get_mempolicy for different platforms are just copied from the libnuma source code [2].
>> 
>> Thanks.
>> Best regards,
>> Jie
>> 
>> 
>> [1] https://github.com/openjdk/jdk/pull/4205#discussion_r639708293
>> [2] https://github.com/numactl/numactl/blob/master/syscall.c
>
> Jie Fu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   __NR_get_mempolicy may be also undefined

Right, `S390` is used in OS independent hotspot code. `__s390x__` comes from the linux headers. So, in os_linux, both macros can get used.
I'm fine with either version, but I'm not sure if only s390 is affected. I haven't heard from people who build zero on other platforms.

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PR: https://git.openjdk.java.net/jdk/pull/4277