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References: <cover.1640036051.git.andreyknvl@google.com> <dea9eb126793544650ff433612016016070ceb52.1640036051.git.andreyknvl@google.com>
 <YcHI34KT8Am4n45x@elver.google.com>
In-Reply-To: <YcHI34KT8Am4n45x@elver.google.com>
From:   Andrey Konovalov <andreyknvl@gmail.com>
Date:   Thu, 30 Dec 2021 20:11:37 +0100
Message-ID: <CA+fCnZf21dKQLZZf+NNXQ0J0HAdjQLxbGxZqgfxACBb5kUcgNA@mail.gmail.com>
Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init
 for HW_TAGS
To:     Marco Elver <elver@google.com>
Cc:     andrey.konovalov@linux.dev,
        Alexander Potapenko <glider@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Peter Collingbourne <pcc@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrey Konovalov <andreyknvl@google.com>
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On Tue, Dec 21, 2021 at 1:30 PM Marco Elver <elver@google.com> wrote:
>
> On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@linux.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.