Date:   Tue, 21 Dec 2021 13:30:23 +0100
From:   Marco Elver <elver@google.com>
To:     andrey.konovalov@linux.dev
Cc:     Alexander Potapenko <glider@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        kasan-dev@googlegroups.com, 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-kernel@lists.infradead.org,
        Peter Collingbourne <pcc@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        linux-kernel@vger.kernel.org,
        Andrey Konovalov <andreyknvl@google.com>
Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory
 init for HW_TAGS
Message-ID: <YcHI34KT8Am4n45x@elver.google.com>
References: <cover.1640036051.git.andreyknvl@google.com>
 <dea9eb126793544650ff433612016016070ceb52.1640036051.git.andreyknvl@google.com>
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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?