Re: [PATCH V3 2/3] mm/hugetlb: Define a generic fallback for is_hugepage_only_range()

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To: Anshuman Khandual <anshuman.khandual@xxxxxxx>, linux-mm@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH V3 2/3] mm/hugetlb: Define a generic fallback for is_hugepage_only_range()
From: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Date: Mon, 11 May 2020 11:52:34 -0700
Cc: Russell King <linux@xxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <c21ab871-da06-baf6-ba31-80b13402b8c9@arm.com>
References: <1588907271-11920-1-git-send-email-anshuman.khandual@arm.com> <1588907271-11920-3-git-send-email-anshuman.khandual@arm.com> <9fc622e1-45ff-b79f-ebe0-35614837456c@oracle.com> <c21ab871-da06-baf6-ba31-80b13402b8c9@arm.com>
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On 5/10/20 8:14 PM, Anshuman Khandual wrote:
> On 05/09/2020 03:52 AM, Mike Kravetz wrote:
>> On 5/7/20 8:07 PM, Anshuman Khandual wrote:
>>
>> Did you try building without CONFIG_HUGETLB_PAGE defined?  I'm guessing
> 
> Yes I did for multiple platforms (s390, arm64, ia64, x86, powerpc etc).
> 
>> that you need a stub for is_hugepage_only_range().  Or, perhaps add this
>> to asm-generic/hugetlb.h?
>>
> There is already a stub (include/linux/hugetlb.h) when !CONFIG_HUGETLB_PAGE.
> 

Thanks!  I missed that stub in the existing code.  I like the removal of
redundant code.

Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

-- 
Mike Kravetz

References:
- [PATCH V3 0/3] mm/hugetlb: Add some new generic fallbacks
  - From: Anshuman Khandual
- [PATCH V3 2/3] mm/hugetlb: Define a generic fallback for is_hugepage_only_range()
  - From: Anshuman Khandual
- Re: [PATCH V3 2/3] mm/hugetlb: Define a generic fallback for is_hugepage_only_range()
  - From: Mike Kravetz
- Re: [PATCH V3 2/3] mm/hugetlb: Define a generic fallback for is_hugepage_only_range()
  - From: Anshuman Khandual

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