linux-kernel - Re: [PATCH v3 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD

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Message-ID: <18144cc2-f552-b2cc-c41a-47c754de2b0d@huawei.com>
Date:   Tue, 2 Jul 2019 09:27:24 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Alexandre Ghiti <alex@...ti.fr>,
        Christoph Hellwig <hch@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v3 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD_SHARE config
 in arch/Kconfig

On 2019/7/2 1:58, 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@...ti.fr>
> ---
>  arch/Kconfig       | 3 +++
>  arch/arm64/Kconfig | 4 +---
>  arch/x86/Kconfig   | 4 +---
>  3 files changed, 5 insertions(+), 6 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 697ea0510729..c862575decd3 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -71,6 +71,7 @@ config ARM64
>  	select ARCH_SUPPORTS_NUMA_BALANCING
>  	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
>  	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
> @@ -901,9 +902,6 @@ config HW_PERF_EVENTS
>  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)
> -

Reviewed-by: Hanjun Guo <guohanjun@...wei.com>

Thanks
Hanjun