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From:   Alex Ghiti <alex@ghiti.fr>
To:     Hanjun Guo <guohanjun@huawei.com>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-riscv@lists.infradead.org
Subject: Re: [PATCH REBASE v2 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD_SHARE
 config in arch/Kconfig
References: <20190526125038.8419-1-alex@ghiti.fr>
 <20190526125038.8419-2-alex@ghiti.fr>
 <7bfe451b-3f6b-2a26-5d43-692dde891cc0@huawei.com>
Message-ID: <7298dc73-a0c6-54ae-b4bd-0c0a9f76f9d4@ghiti.fr>
Date:   Mon, 1 Jul 2019 01:37:26 -0400
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On 6/30/19 9:58 PM, Hanjun Guo wrote:
> On 2019/5/26 20:50, Alexandre Ghiti wrote:
>> ARCH_WANT_HUGE_PMD_SHARE config was declared in both architectures:
>> move this declaration in arch/Kconfig and make those architectures
>> select it.
>>
>> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
>> Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
>> ---
>>   arch/Kconfig       | 3 +++
>>   arch/arm64/Kconfig | 2 +-
>>   arch/x86/Kconfig   | 4 +---
>>   3 files changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index c47b328eada0..d2f212dc8e72 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -577,6 +577,9 @@ config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
>>   config HAVE_ARCH_HUGE_VMAP
>>   	bool
>>   
>> +config ARCH_WANT_HUGE_PMD_SHARE
>> +	bool
>> +
>>   config HAVE_ARCH_SOFT_DIRTY
>>   	bool
>>   
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 4780eb7af842..dee7f750c42f 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -70,6 +70,7 @@ config ARM64
>>   	select ARCH_SUPPORTS_NUMA_BALANCING
>>   	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
>>   	select ARCH_WANT_FRAME_POINTERS
>> +	select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
>>   	select ARCH_HAS_UBSAN_SANITIZE_ALL
>>   	select ARM_AMBA
>>   	select ARM_ARCH_TIMER
>> @@ -884,7 +885,6 @@ config SYS_SUPPORTS_HUGETLBFS
>>   	def_bool y
>>   
>>   config ARCH_WANT_HUGE_PMD_SHARE
>> -	def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
> Why not remove config ARCH_WANT_HUGE_PMD_SHARE as well?
> Did I miss something?

You're totally right ! Thanks for noticing,

Alex

> Thanks
> Hanjun
>