linux-kernel - Re: [PATCH 03/13] mm: Add generic p?d

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Date:   Wed, 20 Feb 2019 13:56:57 +0000
From:   Steven Price <steven.price@....com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        James Morse <james.morse@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>, x86@...nel.org,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, kirill@...temov.name,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/13] mm: Add generic p?d_large() macros

On 19/02/2019 03:44, Liang, Kan wrote:
> 
> 
> On 2/18/2019 9:19 AM, Steven Price wrote:
>> On 18/02/2019 11:31, Peter Zijlstra wrote:
>>> On Fri, Feb 15, 2019 at 05:02:24PM +0000, Steven Price wrote:
>>>> From: James Morse <james.morse@....com>
>>>>
>>>> Exposing the pud/pgd levels of the page tables to walk_page_range()
>>>> means
>>>> we may come across the exotic large mappings that come with large areas
>>>> of contiguous memory (such as the kernel's linear map).
>>>>
>>>> For architectures that don't provide p?d_large() macros, provided a
>>>> does nothing default.
>>>
>>> Kan was going to fix that for all archs I think..
>>
> 
> Yes, I'm still working on a generic function to retrieve page size.
> The generic p?d_large() issue has been fixed. However, I found that the
> pgd_page() is not generic either. I'm still working on it.
> I will update you on the other thread when all issues are fixed.
> 
> 
> 
>> The latest series I can find from Kan is still x86 specific. I'm happy
>> to rebase onto something else if Kan has an implementation already
>> (please point me in the right direction). Otherwise Kan is obviously
>> free to base on these changes.
>>
> 
> My implementation is similar as yours. I'm happy to re-base on your
> changes.
> 
> Could you please also add a generic p4d_large()?

Sure, I'll include that in the next posting.

Thanks,

Steve