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

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Message-ID: <YcHI34KT8Am4n45x@elver.google.com>
Date:   Tue, 21 Dec 2021 13:30:23 +0100
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, 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-kernel@...ts.infradead.org,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        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 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?