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

[David Hildenbrand (Arm)]

On 6/5/26 18:26, Mark Brown wrote:
> On Fri, Jun 05, 2026 at 09:02:52AM -0700, Linus Torvalds wrote:
>> On Fri, 5 Jun 2026 at 04:02, Mark Brown <broonie@xxxxxxxxxx> 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.

Yeah, I quickly discussed this with Christian on a different channel and he
ended up sharing the report with the analysis directly.

-- 
Cheers,

David