linux-kernel - Re: [PATCH 10/43] kmsan: pgtable: reduce vmalloc space

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Message-ID: <CAG_fn=WWKsYULa-9UHLAWHgGOVjP-Zw8=Kxj4QEZQ5VDL55_Tw@mail.gmail.com>
Date:   Fri, 18 Mar 2022 15:14:10 +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 Memory Management List <linux-mm@...ck.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/43] kmsan: pgtable: reduce vmalloc space

On Wed, Dec 15, 2021 at 2:36 PM Mark Rutland <mark.rutland@....com> wrote:
>
> On Tue, Dec 14, 2021 at 05:20:17PM +0100, Alexander Potapenko wrote:
> > KMSAN is going to use 3/4 of existing vmalloc space to hold the
> > metadata, therefore we lower VMALLOC_END to make sure vmalloc() doesn't
> > allocate past the first 1/4.
> >
> > Signed-off-by: Alexander Potapenko <glider@...gle.com>
>
> It might be worth adding an 'x86: ' prefix to the commit title, since this
> specifically affects x86 headers.

Makes sense, will do!