linux-kernel - Re: [PATCH 2/6] mm: Generalize SYS_SUPPORTS_HUGETLBFS (rename as ARCH_SUPPORTS

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Date:   Tue, 09 Mar 2021 20:39:14 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     anshuman.khandual@....com
CC:     linux-mm@...ck.org, anshuman.khandual@....com,
        linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        tsbogend@...ha.franken.de, James.Bottomley@...senPartnership.com,
        deller@....de, mpe@...erman.id.au, benh@...nel.crashing.org,
        paulus@...ba.org, Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, ysato@...rs.sourceforge.jp, dalias@...c.org,
        viro@...iv.linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject:     Re: [PATCH 2/6] mm: Generalize SYS_SUPPORTS_HUGETLBFS (rename as ARCH_SUPPORTS_HUGETLBFS)

On Tue, 09 Mar 2021 00:33:06 PST (-0800), anshuman.khandual@....com wrote:
> SYS_SUPPORTS_HUGETLBFS config has duplicate definitions on platforms that
> subscribe it. Instead, just make it a generic option which can be selected
> on applicable platforms. Also rename it as ARCH_SUPPORTS_HUGETLBFS instead.
> This reduces code duplication and makes it cleaner.
>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
> Cc: Helge Deller <deller@....de>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-mips@...r.kernel.org
> Cc: linux-parisc@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-riscv@...ts.infradead.org
> Cc: linux-sh@...r.kernel.org
> Cc: linux-fsdevel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>  arch/arm/Kconfig                       | 5 +----
>  arch/arm64/Kconfig                     | 4 +---
>  arch/mips/Kconfig                      | 6 +-----
>  arch/parisc/Kconfig                    | 5 +----
>  arch/powerpc/Kconfig                   | 3 ---
>  arch/powerpc/platforms/Kconfig.cputype | 6 +++---
>  arch/riscv/Kconfig                     | 5 +----
>  arch/sh/Kconfig                        | 5 +----
>  fs/Kconfig                             | 5 ++++-
>  9 files changed, 13 insertions(+), 31 deletions(-)

[...]

> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 85d626b8ce5e..69954db3aca9 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -30,6 +30,7 @@ config RISCV
>  	select ARCH_HAS_STRICT_KERNEL_RWX if MMU
>  	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
>  	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
> +	select ARCH_SUPPORTS_HUGETLBFS if MMU
>  	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
>  	select ARCH_WANT_FRAME_POINTERS
>  	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
> @@ -165,10 +166,6 @@ config ARCH_WANT_GENERAL_HUGETLB
>  config ARCH_SUPPORTS_UPROBES
>  	def_bool y
>
> -config SYS_SUPPORTS_HUGETLBFS
> -	depends on MMU
> -	def_bool y
> -
>  config STACKTRACE_SUPPORT
>  	def_bool y

Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>