linux-kernel - Re: [PATCH] 9p: Avoid creating multiple slab caches with the same name

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Message-ID: <1cb07628-269c-4d6c-9936-f3a2b233165f@leemhuis.info>
Date: Fri, 18 Oct 2024 20:54:15 +0200
From: Thorsten Leemhuis <regressions@...mhuis.info>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Eric Van Hensbergen <ericvh@...nel.org>,
 Dominique Martinet <asmadeus@...ewreck.org>,
 Christian Schoenebeck <linux_oss@...debyte.com>, v9fs@...ts.linux.dev,
 linux-kernel@...r.kernel.org, regressions@...ts.linux.dev,
 Vlastimil Babka <vbabka@...e.cz>, Jason Gunthorpe <jgg@...dia.com>,
 Pedro Falcato <pedro.falcato@...il.com>
Subject: Re: [PATCH] 9p: Avoid creating multiple slab caches with the same
 name

[reinserting a bit of quotation below for Linus]

TLDR: Linus, I wonder if it would be best if you could merge the patch
at the start of this thread
(https://lore.kernel.org/all/20240807094725.2193423-1-pedro.falcato@gmail.com/
), which can also be found as 79efebae4afc22 in -next if you prefer to
cherry-pick it from there. Either now or after 24 to 36 hours, which
would give Eric a chance to ACK/NACK this if he sees this mail.

For details see below.

On 18.10.24 20:36, Pedro Falcato wrote:
> On Fri, Oct 18, 2024 at 6:28 PM Jason Gunthorpe <jgg@...dia.com> wrote:
>>
>> On Wed, Aug 07, 2024 at 10:47:25AM +0100, Pedro Falcato wrote:
>>> In the spirit of [1], avoid creating multiple slab caches with the same
>>> name. Instead, add the dev_name into the mix.
>>>
>>> [1]: https://lore.kernel.org/all/20240807090746.2146479-1-pedro.falcato@gmail.com/
>>>
>>> Signed-off-by: Pedro Falcato <pedro.falcato@...il.com>
>>> ---
>>>  net/9p/client.c | 10 +++++++++-
>>>  1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> Can this get picked up to rc4 please?

Eric apparently has not much time or upstream work currently (but
recently showed up in a discussion about another regression:
https://lore.kernel.org/all/Zw-J0DdrCFLYpT5y@codewreck.org/ ).

>> It is causing regressions in my environment
>> #regzbot introduced: 4c39529663b9

If anyone wonders, that is 4c39529663b931 ("slab: Warn on duplicate
cache names when DEBUG_VM=y") [v6.12-rc1]. That's also why I'm CCing
Vlastimil, so he knows about this.

> FWIW, seems to have been picked up into 9pfs-next
> (https://github.com/martinetd/linux/commit/79efebae4afc2221fa814c3cae001bede66ab259).
> Seems like we're just missing a PR to Linus?

In that case: Linus, given the circumstances I wonder if it would be
best if you could merge the patch at the start of this thread
(https://lore.kernel.org/all/20240807094725.2193423-1-pedro.falcato@gmail.com/
) directly, which can also be found as 79efebae4afc22 in -next if you
prefer to cherry-pick it from there  Either now or after 24 to 36 hours,
which would give Eric a chance to ACK/NACK this if he sees this mail.

Ciao, Thorsten