Re: git: 5a7e48dddfb5 - main - tests: Add MAP_32BIT flag test

On Tue, Aug 01, 2023 at 09:29:32PM +0100, Jessica Clarke wrote:
> On 1 Aug 2023, at 21:24, Dmitry Chagin <dchagin@FreeBSD.org> wrote:
> > 
> > The branch main has been updated by dchagin:
> > 
> > URL: https://cgit.FreeBSD.org/src/commit/?id=5a7e48dddfb5a668ded4742b79e6f6f88b647e6a
> > 
> > commit 5a7e48dddfb5a668ded4742b79e6f6f88b647e6a
> > Author:     Dmitry Chagin <dchagin@FreeBSD.org>
> > AuthorDate: 2023-08-01 20:23:15 +0000
> > Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
> > CommitDate: 2023-08-01 20:23:15 +0000
> > 
> >    tests: Add MAP_32BIT flag test
> > 
> >    Reviewed by:            kib, markj
> >    Differential Revision:  https://reviews.freebsd.org/D41236
> >    MFC after:              1 month
> > ---
> > tests/sys/vm/Makefile                |  8 ++++++
> > tests/sys/vm/mmap_map_32bit_helper.c | 51 ++++++++++++++++++++++++++++++++++++
> > tests/sys/vm/mmap_map_32bit_test.sh  | 37 ++++++++++++++++++++++++++
> > 3 files changed, 96 insertions(+)
> > 
> > diff --git a/tests/sys/vm/Makefile b/tests/sys/vm/Makefile
> > index 8ef8a45e5f39..9aac49bc5320 100644
> > --- a/tests/sys/vm/Makefile
> > +++ b/tests/sys/vm/Makefile
> > @@ -9,4 +9,12 @@ ATF_TESTS_C+= mlock_test \
> > page_fault_signal \
> > shared_shadow_inval_test
> > 
> > +.if ${MACHINE_ARCH} != "i386" && ${MACHINE} != "arm" && \
> > + (${MACHINE} != "powerpc" || ${MACHINE_ARCH} != "powerpc")
> > + # MAP_32BIT is only available on 64-bit platforms
> 
> So use ${MACHINE_ABI:Mlong64} after including src.opts.mk?

May be we should enable the MAP_32BIT flag on 32bit arches, instead?
It requests allocation below 2G, which is half of VA on i386, or 2/3
on arm.  Interestingly, it should work already from compat32.