linux-kernel - Re: [PATCH v1 2/2] mm: simplify free_highmem_page() and free_reserved

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Date:   Wed, 27 Jan 2021 12:51:27 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: Re: [PATCH v1 2/2] mm: simplify free_highmem_page() and
 free_reserved_page()

On Tue, Jan 26, 2021 at 07:21:13PM +0100, David Hildenbrand wrote:
> adjust_managed_page_count() as called by free_reserved_page() properly
> handles pages in a highmem zone, so we can reuse it for
> free_highmem_page().
> 
> We can now get rid of totalhigh_pages_inc() and simplify
> free_reserved_page().
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
> Cc: Mike Rapoport <rppt@...nel.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> +#define free_highmem_page(page) free_reserved_page(page)

Should we place that under #ifdef CONFIG_HIGHMEM to make clear
that it is only used on that config?
Maybe the #ifdefery ugliness does not pay off.

-- 
Oscar Salvador
SUSE L3