linux-kernel - Re: [PATCH v2 09/23] m68k: use asm-generic/mmu

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Message-ID: <CAMuHMdWfACYhp8434GOx0qx2oHSBTX3Tq+=gtqNtYahnP-t1JQ@mail.gmail.com>
Date:   Tue, 1 Sep 2020 09:03:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2 09/23] m68k: use asm-generic/mmu_context.h for no-op implementations

Hi Nick,

On Tue, Sep 1, 2020 at 8:23 AM Nicholas Piggin <npiggin@...il.com> wrote:
> Excerpts from Geert Uytterhoeven's message of August 27, 2020 7:33 pm:
> > On Wed, Aug 26, 2020 at 4:53 PM Nicholas Piggin <npiggin@...il.com> wrote:
> >> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> >> Cc: linux-m68k@...ts.linux-m68k.org
> >> Signed-off-by: Nicholas Piggin <npiggin@...il.com>
> >
> > With the below fixed:
> > Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> >
> >> --- a/arch/m68k/include/asm/mmu_context.h
> >> +++ b/arch/m68k/include/asm/mmu_context.h
> >> @@ -79,19 +76,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
> >>         set_context(tsk->mm->context, next->pgd);
> >>  }
> >>
> >> -/*
> >> - * After we have set current->mm to a new value, this activates
> >> - * the context for the new mm so we see the new mappings.
> >> - */
> >> -static inline void activate_mm(struct mm_struct *active_mm,
> >> -       struct mm_struct *mm)
> >> -{
> >> -       get_mmu_context(mm);
> >> -       set_context(mm->context, mm->pgd);
> >> -}
> >
> > Assumed switch_mm() in [PATCH v2 01/23] is revived with the above body.
>
> I'm not sure what you mean here. We can remove this because it's a copy
> of switch_mm above, and that's what the new header defaults to if you
> don't provide an active_mm.

IC.  I thought it started relying on <asm-generic/mmu_context.h> for this,
where you removed switch_mm().

Seems I missed the definition above.

> Patch 1 should not have changed that, it should only affect the nommu
> architectures (and actually didn't touch m68k because it was not using
> the asm-generic/mmu_context.h header).

OK. Sorry for the noise.

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