linux-kernel - Re: [PATCH v2 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD

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Message-ID: <mhng-4d1d4acb-f65f-4ed4-bc86-85a14b7c3e16@palmer-si-x1e>
Date:   Thu, 25 Apr 2019 10:42:43 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     alex@...ti.fr, catalin.marinas@....com,
        Will Deacon <will.deacon@....com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de
CC:     Christoph Hellwig <hch@...radead.org>, mike.kravetz@...cle.com,
        aou@...s.berkeley.edu, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, alex@...ti.fr
Subject:     Re: [PATCH v2 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD_SHARE config in arch/Kconfig

On Mon, 08 Apr 2019 23:14:48 PDT (-0700), alex@...ti.fr 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 | 2 +-
>  arch/x86/Kconfig   | 4 +---
>  3 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 8c858bb133c9..273cefc6b787 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -567,6 +567,9 @@ 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 870ef86a64ed..8b7870974961 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -68,6 +68,7 @@ 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
> @@ -885,7 +886,6 @@ 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)
>
>  config ARCH_HAS_CACHE_LINE_SIZE
>  	def_bool y
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 0f2ab09da060..fd5fc2d288be 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -82,6 +82,7 @@ config X86
>  	select ARCH_USE_QUEUED_SPINLOCKS
>  	select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
>  	select ARCH_WANTS_DYNAMIC_TASK_STRUCT
> +	select ARCH_WANT_HUGE_PMD_SHARE
>  	select ARCH_WANTS_THP_SWAP		if X86_64
>  	select BUILDTIME_EXTABLE_SORT
>  	select CLKEVT_I8253
> @@ -298,9 +299,6 @@ config ARCH_HIBERNATION_POSSIBLE
>  config ARCH_SUSPEND_POSSIBLE
>  	def_bool y
>
> -config ARCH_WANT_HUGE_PMD_SHARE
> -	def_bool y
> -
>  config ARCH_WANT_GENERAL_HUGETLB
>  	def_bool y

Reviewed-by: Palmer Dabbelt <palmer@...ive.com>

Let me know if you want this via my tree, as I'd also like patch 2 which
depends on this one.  I've tenatively added both to my for-next tree for now.