Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()

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To: David Howells <dhowells@xxxxxxxxxx>
Subject: Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
From: Stefan Metzmacher <metze@xxxxxxxxx>
Date: Wed, 25 Jun 2025 13:51:14 +0200
Cc: "linux-cifs@xxxxxxxxxxxxxxx" <linux-cifs@xxxxxxxxxxxxxxx>, netfs@xxxxxxxxxxxxxxx, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Steve French <stfrench@xxxxxxxxxxxxx>
In-reply-to: <1341840.1750850709@warthog.procyon.org.uk>
User-agent: Mozilla Thunderbird

Am 25.06.25 um 13:25 schrieb David Howells:

Stefan Metzmacher <metze@xxxxxxxxx> wrote:

[  922.218230] [   T6642] kernel BUG at mm/usercopy.c:102!


Ah, I don't have that config option enabled.  With it, I can reproduce that.


Ah, allocate_caches_and_workqueue() needs to use kmem_cache_create_usercopy/KMEM_CACHE_USERCOPY...

I was already using that in my old wip smbdirect code.

metze

References:
- Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
  - From: Stefan Metzmacher
- Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
  - From: Stefan Metzmacher
- Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
  - From: David Howells
- Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
  - From: Stefan Metzmacher
- Re: [PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter()
  - From: David Howells

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