linux-kernel - Re: [PATCH 3/3] raid: substitute empty_zero_page with helper ZERO

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Date:   Wed, 19 Oct 2022 04:00:07 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Giulio Benetti <giulio.benetti@...ettiengineering.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-raid@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Mark Brown <broonie@...nel.org>,
        Song Liu <song@...nel.org>
Subject: Re: [PATCH 3/3] raid: substitute empty_zero_page with helper
 ZERO_PAGE(0)

On Tue, Oct 18, 2022 at 11:57:55PM +0200, Giulio Benetti wrote:
>  #if RAID6_USE_EMPTY_ZERO_PAGE
> -# define raid6_empty_zero_page empty_zero_page
> +# define raid6_empty_zero_page ZERO_PAGE(0)
>  #else
>  extern const char raid6_empty_zero_page[PAGE_SIZE];

RAID6_USE_EMPTY_ZERO_PAGE is never set to a non-zero value.  So this
is dead code and we can just remove all code related to the
RAID6_USE_EMPTY_ZERO_PAGE case.