From: Vlastimil Babka <vbabka@suse.cz>
To: "Darrick J. Wong" <djwong@kernel.org>,
David Rientjes <rientjes@google.com>
Cc: Rustam Kovhaev <rkovhaev@gmail.com>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, cl@linux.com, penberg@kernel.org,
iamjoonsoo.kim@lge.com, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
gregkh@linuxfoundation.org, Al Viro <viro@zeniv.linux.org.uk>,
dvyukov@google.com
Subject: Re: [PATCH] xfs: use kmem_cache_free() for kmem_cache objects
Date: Tue, 12 Oct 2021 23:32:25 +0200 [thread overview]
Message-ID: <9db5d16a-2999-07a4-c49d-7417601f834f@suse.cz> (raw)
In-Reply-To: <20211012204345.GQ24307@magnolia>
On 10/12/2021 10:43 PM, Darrick J. Wong wrote:
> On Tue, Oct 12, 2021 at 01:43:20PM -0700, Darrick J. Wong wrote:
>> On Sun, Oct 03, 2021 at 06:07:20PM -0700, David Rientjes wrote:
>>> On Thu, 30 Sep 2021, Rustam Kovhaev wrote:
>>>
>>>>>>> I think it's fair if something like XFS (not meant for tiny systems AFAIK?)
>>>>>>> excludes SLOB (meant for tiny systems). Clearly nobody tried to use these
>>>>>>> two together last 5 years anyway.
>>>>>>
>>>>>> +1 for adding Kconfig option, it seems like some things are not meant to
>>>>>> be together.
>>>>>
>>>>> But if we patch SLOB, we won't need it.
>>>>
>>>> OK, so we consider XFS on SLOB a supported configuration that might be
>>>> used and should be tested.
>>>> I'll look into maybe adding a config with CONFIG_SLOB and CONFIG_XFS_FS
>>>> to syzbot.
>>>>
>>>> It seems that we need to patch SLOB anyway, because any other code can
>>>> hit the very same issue.
>>>>
>>>
>>> It's probably best to introduce both (SLOB fix and Kconfig change for
>>> XFS), at least in the interim because the combo of XFS and SLOB could be
>>> broken in other ways. If syzbot doesn't complain with a patched kernel to
>>> allow SLOB to be used with XFS, then we could potentially allow them to be
>>> used together.
>>>
>>> (I'm not sure that this freeing issue is the *only* thing that is broken,
>>> nor that we have sufficient information to make that determination right
>>> now..)
>>
>> I audited the entire xfs (kernel) codebase and didn't find any other
>> usage errors. Thanks for the patch; I'll apply it to for-next.
Which patch, the one that started this thread and uses kmem_cache_free() instead
of kfree()? I thought we said it's not the best way?
> Also, the obligatory
>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
>
> --D
>
>>
>> --D
next prev parent reply other threads:[~2021-10-12 21:32 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 21:23 [PATCH] xfs: use kmem_cache_free() for kmem_cache objects Rustam Kovhaev
2021-09-30 4:42 ` Dave Chinner
2021-09-30 8:13 ` Vlastimil Babka
2021-09-30 18:48 ` Rustam Kovhaev
2021-09-30 21:10 ` Vlastimil Babka
2021-10-01 0:32 ` Rustam Kovhaev
2021-10-04 1:07 ` David Rientjes
2021-10-04 1:07 ` David Rientjes
2021-10-12 20:43 ` Darrick J. Wong
2021-10-12 20:43 ` Darrick J. Wong
2021-10-12 21:32 ` Vlastimil Babka [this message]
2021-10-12 23:22 ` Darrick J. Wong
2021-10-13 7:38 ` Vlastimil Babka
2021-10-13 16:56 ` Rustam Kovhaev
2021-10-15 0:57 ` Darrick J. Wong
2021-10-18 3:38 ` [PATCH] slob: add size header to all allocations Rustam Kovhaev
2021-10-18 9:22 ` Vlastimil Babka
2021-10-19 1:22 ` Rustam Kovhaev
2021-10-20 11:46 ` Hyeonggon Yoo
2021-10-21 17:36 ` Vlastimil Babka
2021-10-23 6:41 ` [PATCH v2] " Rustam Kovhaev
2021-10-25 9:36 ` Vlastimil Babka
2021-10-25 21:49 ` Rustam Kovhaev
2021-10-29 3:05 ` [PATCH v3] " Rustam Kovhaev
2021-11-16 11:26 ` Vlastimil Babka
2021-11-16 23:19 ` Rustam Kovhaev
2021-11-22 1:30 ` [PATCH v4] " Rustam Kovhaev
2021-11-22 9:22 ` Christoph Lameter
2021-11-22 9:40 ` Vlastimil Babka
2021-11-22 10:36 ` Christoph Lameter
2021-11-22 10:45 ` Vlastimil Babka
2021-11-22 11:40 ` Christoph Lameter
2021-11-22 11:49 ` Vlastimil Babka
2021-11-23 10:18 ` David Laight
2021-11-30 7:00 ` Rustam Kovhaev
2021-11-30 9:23 ` David Laight
2021-11-30 9:41 ` Christoph Lameter
2021-11-30 14:55 ` Vlastimil Babka
2021-11-30 15:21 ` David Laight
2021-11-30 15:39 ` Vlastimil Babka
2021-11-30 15:26 ` Christoph Lameter
2021-10-24 10:43 ` [PATCH] " Hyeonggon Yoo
2021-10-25 8:19 ` Vlastimil Babka
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