linux-kernel - Re: [PATCH v4 29/45] block: kmsan: skip bio block merging logic for KMSAN

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Message-ID: <CAG_fn=V_0Jw_mKpj0P5-hUeCUZZzC2u1LCD8Nvp8FvCy_x=wqg@mail.gmail.com>
Date:   Tue, 2 Aug 2022 19:47:21 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.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>,
        Mark Rutland <mark.rutland@....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>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH v4 29/45] block: kmsan: skip bio block merging logic for KMSAN

On Wed, Jul 13, 2022 at 12:23 PM Marco Elver <elver@...gle.com> wrote:
>
> On Fri, Jul 01, 2022 at 04:22PM +0200, 'Alexander Potapenko' via kasan-dev wrote:
> [...]
> > --- a/block/bio.c
> > +++ b/block/bio.c
> > @@ -867,6 +867,8 @@ static inline bool page_is_mergeable(const struct bio_vec *bv,
> >               return false;
> >
> >       *same_page = ((vec_end_addr & PAGE_MASK) == page_addr);
> > +     if (!*same_page && IS_ENABLED(CONFIG_KMSAN))
> > +             return false;
> >       if (*same_page)
> >               return true;
>
>         if (*same_page)
>                 return true;
>         else if (IS_ENABLED(CONFIG_KMSAN))
>                 return false;
>
Done.
> >       return (bv->bv_page + bv_end / PAGE_SIZE) == (page + off / PAGE_SIZE);



-- 
Alexander Potapenko
Software Engineer

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