Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS

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To: andrey.konovalov@xxxxxxxxx
Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS
From: Marco Elver <elver@xxxxxxxxxx>
Date: Tue, 21 Dec 2021 13:30:23 +0100
Cc: Alexander Potapenko <glider@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andrey Konovalov <andreyknvl@xxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Peter Collingbourne <pcc@xxxxxxxxxx>, Evgenii Stepanov <eugenis@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andrey Konovalov <andreyknvl@xxxxxxxxxx>
In-reply-to: <dea9eb126793544650ff433612016016070ceb52.1640036051.git.andreyknvl@google.com>
References: <cover.1640036051.git.andreyknvl@google.com> <dea9eb126793544650ff433612016016070ceb52.1640036051.git.andreyknvl@google.com>
User-agent: Mutt/2.0.5 (2021-01-21)

On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@xxxxxxxxx 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?

Follow-Ups:
- Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS
  - From: Andrey Konovalov

References:
- [PATCH mm v4 00/39] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS
  - From: andrey . konovalov
- [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS
  - From: andrey . konovalov

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