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

Mark Brown <[email protected]> Fri, 5 Jun 2026 17:26:49 +0100

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

On Fri, Jun 05, 2026 at 09:02:52AM -0700, Linus Torvalds wrote:
> On Fri, 5 Jun 2026 at 04:02, Mark Brown <[email protected]> wrote:

> > | L4472tst_test.c:2050: TINFO: Tested kernel: 7.1.0-rc6-next-20260604 #1 SMP @1780589917 armv7l
> > | L4473tst_kconfig.c:71: TINFO: Couldn't locate kernel config!
> > | L4474tst_test.c:1875: TINFO: Overall timeout per run is 0h 00m 30s

> I htink this is the same thing that Christian already noted (he said
> "reported by David", but I don't know which David ;), where the
> vmsplice() writev() emulation was done as a blocking write, even
> though vmsplice only blocked at the beginning (ie waiting only for
> _initial_ space to write, not then blocking afterwards).

Ah, yes it is - exactly the same issue that's mentioned in[1], I missed
it in the middle of the quite large thread and didn't directly find
David's report.  Sorry for the duplication there.

[1] https://lore.kernel.org/r/20260603-raumfahrt-unmerklich-ertrugen-c4ecae70d5f9@brauner

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