linux-kernel - Re: [PATCH for-mm 1/2] mm/internal: Implement no-op mlock_page_drain() for !CONFIG

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Date:   Wed, 9 Feb 2022 17:19:11 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-mm 1/2] mm/internal: Implement no-op
 mlock_page_drain() for !CONFIG_MMU

Hi Hugh,

On Wed, Feb 9, 2022 at 4:38 PM Hugh Dickins <hughd@...gle.com> wrote:
> The thing is, SeongJae's patch makes me wonder, why did it not need a
> !CONFIG_MMU definition for need_mlock_page_drain() too?  That's because
> mm/swap.c's call to it is under an #ifdef CONFIG_SMP, and I imagine that
> CONFIG_MMU=n usually goes along with (but does not necessarily imply?)
> CONFIG_SMP=n.  It'll be safer to add a need_mlock_page_drain() stub too.

RISC-V K210 is SMP without MMU.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds