Re: [PATCH 2/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2

Askar Safin <[email protected]> Tue, 16 Jun 2026 03:36:59 +0300

Newsgroups	org.kernel.vger.linux-api,dev.linux.lists.patches,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-next,org.kernel.vger.linux-s390,org.kernel.vger.netdev
Message-ID	<[email protected]>

Alexander Gordeev <[email protected]>:
> Hi All,
> 
> This patch as commit e2c0b2368081b ("vmsplice: make vmsplice a trivial
> wrapper for preadv2/pwritev2") in linux-next on s390 causes the selftest
> tools/testing/selftests/mm/cow.c to hang:
> 
> # [RUN] vmsplice() + unmap in child ... with PTE-mapped THP (128 kB)
> 
> Recently there has been changes in THP area, so the problem is not
> necessary linked to this patch per se.
> 
> Please, let me know if you need any additional information.
> 
> Thanks!

As well as I understand, this test uses vmsplice to pin pages.
I. e. if my patch lands, then this test should be rewriten to use
some other mechanism.

-- 
Askar Safin