linux-kernel - Re: [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write

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Date:   Wed, 15 Feb 2017 11:45:12 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        akpm@...ux-foundation.org, Rik van Riel <riel@...riel.com>,
        Mel Gorman <mgorman@...hsingularity.net>, paulus@...abs.org,
        benh@...nel.crashing.org
Cc:     linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write

"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> writes:

> Michael Ellerman <mpe@...erman.id.au> writes:
>
>> "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> writes:
>>> diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
>>> index 0735d5a8049f..8720a406bbbe 100644
>>> --- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
>>> +++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
>>> @@ -16,6 +16,9 @@
>>>  #include <asm/page.h>
>>>  #include <asm/bug.h>
>>>  
>>> +#ifndef __ASSEMBLY__
>>> +#include <linux/mmdebug.h>
>>> +#endif
>>
>> I assume that's for the VM_BUG_ON() you add below. But if so wouldn't
>> the #include be better placed in book3s/64/pgtable.h also?
>
> mmu-hash.h has got a hack that is explained below
>
> #ifndef __ASSEMBLY__
> #include <linux/mmdebug.h>
> #endif
> /*
>  * This is necessary to get the definition of PGTABLE_RANGE which we
>  * need for various slices related matters. Note that this isn't the
>  * complete pgtable.h but only a portion of it.
>  */
> #include <asm/book3s/64/pgtable.h>
>
> This is the only place where we do that book3s/64/pgtable.h include this
> way. Everybody should include asm/pgable.h which picks the righ version
> based on different config option.

I don't understand how that is related.

If you're adding a VM_BUG_ON() in book3s/64/pgtable.h, why isn't the
include of mmdebug.h in that file also?

cheers