linux-kernel - Re: [PATCH net-next] vhost: use "checked" versions of get_user() and put

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Message-ID: <76DE60E2-4A83-4BA0-B8EF-C8AE536F823D@nutanix.com>
Date: Thu, 27 Nov 2025 02:58:48 +0000
From: Jon Kohler <jon@...anix.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Arnd Bergmann <arnd@...db.de>, Jason Wang <jasowang@...hat.com>,
        "Michael
 S. Tsirkin" <mst@...hat.com>,
        Eugenio Pérez
	<eperezma@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux.dev" <virtualization@...ts.linux.dev>,
        Netdev
	<netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Sean
 Christopherson <seanjc@...gle.com>,
        "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>,
        Alexandre Belloni
	<alexandre.belloni@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Drew Fustini <fustini@...nel.org>
Subject: Re: [PATCH net-next] vhost: use "checked" versions of get_user() and
 put_user()



> On Nov 26, 2025, at 4:45 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> On Wed, 26 Nov 2025 at 13:43, Jon Kohler <jon@...anix.com> wrote:
>> 
>> Linus mentioned he might get into the mix and do a bulk
>> change and kill the whole thing once and for all, so I’m
>> simply trying to help knock an incremental amount of work
>> off the pile in advance of that (and reap some performance
>> benefits at the same time, at least on the x86 side).
> 
> So I'm definitely going to do some bulk conversion at some point, but
> honestly, I'll be a lot happier if most users already self-converted
> before that, and I only end up doing a "convert unmaintained old code
> that nobody really cares about".
> 
>                  Linus

That is fair, thanks Linus. I’ll see if I can pick off a couple
more to start thinning out the pile, and see what sort of trouble
I can get into.

Cheers - Jon