linux-kernel - Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW

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Message-ID: <CA+fCnZf21dKQLZZf+NNXQ0J0HAdjQLxbGxZqgfxACBb5kUcgNA@mail.gmail.com>
Date:   Thu, 30 Dec 2021 20:11:37 +0100
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     andrey.konovalov@...ux.dev,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init
 for HW_TAGS

On Tue, Dec 21, 2021 at 1:30 PM Marco Elver <elver@...gle.com> wrote:
>
> On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@...ux.dev wrote:
> [...]
> >  /* Room for N __GFP_FOO bits */
> >  #define __GFP_BITS_SHIFT (24 +                                       \
> > +                       IS_ENABLED(CONFIG_KASAN_HW_TAGS) +    \
> >                         IS_ENABLED(CONFIG_KASAN_HW_TAGS) +    \
> >                         IS_ENABLED(CONFIG_KASAN_HW_TAGS) +    \
> >                         IS_ENABLED(CONFIG_LOCKDEP))
>
> Does '3 * IS_ENABLED(CONFIG_KASAN_HW_TAGS)' work?

Yes, will do in v5.