linux-kernel - Re: [PATCH 33/43] kmsan: disable physical page merging in biovec

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Message-ID: <CAG_fn=UZSVGLLm-O0o8bW1P=AzwF+wvGbDEq1PVB+HHf8wdU+g@mail.gmail.com>
Date:   Wed, 15 Dec 2021 17:30:14 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Marco Elver <elver@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 33/43] kmsan: disable physical page merging in biovec

On Wed, Dec 15, 2021 at 3:17 PM Mark Rutland <mark.rutland@....com> wrote:
>
> On Tue, Dec 14, 2021 at 05:20:40PM +0100, Alexander Potapenko wrote:
> > KMSAN metadata for consequent physical pages may be inconsequent,
>
> I think you mean 'adjacent'/ rather than 'consequent' here, i.e.
Correct, thank you!

> > +     /*
> > +      * Merging consequent physical pages may not work correctly under KMSAN
> > +      * if their metadata pages aren't consequent. Just disable merging.
> > +      */
>
> Likewise here.
Ack.