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

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Date:   Tue, 01 Sep 2020 16:23:43 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

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.

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).

Thanks,
Nick