linux-kernel - Re: [akpm-mm:mm-stable] [mm] c25465eb76: ltp.swapon03.fail

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Message-ID: <73bea938-15a2-4b4a-8d31-0db9f9c476e0@redhat.com>
Date: Mon, 24 Mar 2025 12:53:55 +0100
From: David Hildenbrand <david@...hat.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com,
 Andrew Morton <akpm@...ux-foundation.org>,
 Simona Vetter <simona.vetter@...ll.ch>, Alistair Popple
 <apopple@...dia.com>, Alex Shi <alexs@...nel.org>,
 Danilo Krummrich <dakr@...nel.org>, Dave Airlie <airlied@...il.com>,
 Jann Horn <jannh@...gle.com>, Jason Gunthorpe <jgg@...dia.com>,
 Jerome Glisse <jglisse@...hat.com>, John Hubbard <jhubbard@...dia.com>,
 Jonathan Corbet <corbet@....net>, Karol Herbst <kherbst@...hat.com>,
 Liam Howlett <liam.howlett@...cle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Lyude <lyude@...hat.com>,
 "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
 Oleg Nesterov <oleg@...hat.com>, Pasha Tatashin <pasha.tatashin@...een.com>,
 Peter Xu <peterx@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 SeongJae Park <sj@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
 Yanteng Si <si.yanteng@...ux.dev>, Barry Song <v-songbaohua@...o.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, ltp@...ts.linux.it
Subject: Re: [akpm-mm:mm-stable] [mm] c25465eb76: ltp.swapon03.fail

On 24.03.25 09:49, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed "ltp.swapon03.fail" on:
> 
> commit: c25465eb7630ffcadaab29c1010071512f8c9621 ("mm: use single SWP_DEVICE_EXCLUSIVE entry type")
> https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-stable
> 
> 
> in testcase: ltp
> version: ltp-x86_64-042eff32a-1_20250322
> with following parameters:
> 
> 	disk: 1HDD
> 	fs: btrfs
> 	test: syscalls-04/swapon03
> 
> 
> 
> config: x86_64-rhel-9.4-ltp
> compiler: gcc-12
> test machine: 4 threads 1 sockets Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz (Ivy Bridge) with 8G memory

LTP needs fixing.

tst_max_swapfiles() detects the number of supported swapfiles by parsing 
the kernel config, expecting that with CONFIG_DEVICE_PRIVATE we'd use 4 
on newer kernels.

Now it's "3", and consequently we support one more swapfile which the 
test cannot deal with (expecting a failure)

So, all good from a kernel perspective.

-- 
Cheers,

David / dhildenb