From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
linux-mm@kvack.org, akpm@linux-foundation.org
Cc: linux-s390@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-parisc@vger.kernel.org, linux-xtensa@linux-xtensa.org,
linux-sh@vger.kernel.org, linux-hexagon@vger.kernel.org,
x86@kernel.org, linux-um@lists.infradead.org,
linux-mips@vger.kernel.org, linux-csky@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
openrisc@lists.librecores.org, linux-alpha@vger.kernel.org,
sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-snps-arc@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS
Date: Wed, 14 Apr 2021 07:22:06 +0200 [thread overview]
Message-ID: <f29ba8e2-3071-c963-1e9f-e8c88526ed8d@csgroup.eu> (raw)
In-Reply-To: <1618368899-20311-1-git-send-email-anshuman.khandual@arm.com>
Le 14/04/2021 à 04:54, Anshuman Khandual a écrit :
> Currently most platforms define FIRST_USER_ADDRESS as 0UL duplicating the
> same code all over. Instead define a new option ARCH_HAS_FIRST_USER_ADDRESS
> for those platforms which would override generic default FIRST_USER_ADDRESS
> value 0UL. This makes it much cleaner with reduced code.
>
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-snps-arc@lists.infradead.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-csky@vger.kernel.org
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-ia64@vger.kernel.org
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-mips@vger.kernel.org
> Cc: openrisc@lists.librecores.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-riscv@lists.infradead.org
> Cc: linux-s390@vger.kernel.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> Cc: linux-um@lists.infradead.org
> Cc: linux-xtensa@linux-xtensa.org
> Cc: x86@kernel.org
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
> arch/alpha/include/asm/pgtable.h | 1 -
> arch/arc/include/asm/pgtable.h | 6 ------
> arch/arm/Kconfig | 1 +
> arch/arm64/include/asm/pgtable.h | 2 --
> arch/csky/include/asm/pgtable.h | 1 -
> arch/hexagon/include/asm/pgtable.h | 3 ---
> arch/ia64/include/asm/pgtable.h | 1 -
> arch/m68k/include/asm/pgtable_mm.h | 1 -
> arch/microblaze/include/asm/pgtable.h | 2 --
> arch/mips/include/asm/pgtable-32.h | 1 -
> arch/mips/include/asm/pgtable-64.h | 1 -
> arch/nds32/Kconfig | 1 +
> arch/nios2/include/asm/pgtable.h | 2 --
> arch/openrisc/include/asm/pgtable.h | 1 -
> arch/parisc/include/asm/pgtable.h | 2 --
> arch/powerpc/include/asm/book3s/pgtable.h | 1 -
> arch/powerpc/include/asm/nohash/32/pgtable.h | 1 -
> arch/powerpc/include/asm/nohash/64/pgtable.h | 2 --
> arch/riscv/include/asm/pgtable.h | 2 --
> arch/s390/include/asm/pgtable.h | 2 --
> arch/sh/include/asm/pgtable.h | 2 --
> arch/sparc/include/asm/pgtable_32.h | 1 -
> arch/sparc/include/asm/pgtable_64.h | 3 ---
> arch/um/include/asm/pgtable-2level.h | 1 -
> arch/um/include/asm/pgtable-3level.h | 1 -
> arch/x86/include/asm/pgtable_types.h | 2 --
> arch/xtensa/include/asm/pgtable.h | 1 -
> include/linux/mm.h | 4 ++++
> mm/Kconfig | 4 ++++
> 29 files changed, 10 insertions(+), 43 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 8ba434287387..47098ccd715e 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -46,6 +46,10 @@ extern int sysctl_page_lock_unfairness;
>
> void init_mm_internals(void);
>
> +#ifndef ARCH_HAS_FIRST_USER_ADDRESS
I guess you didn't test it ..... :)
should be #ifndef CONFIG_ARCH_HAS_FIRST_USER_ADDRESS
> +#define FIRST_USER_ADDRESS 0UL
> +#endif
But why do we need a config option at all for that ?
Why not just:
#ifndef FIRST_USER_ADDRESS
#define FIRST_USER_ADDRESS 0UL
#endif
> +
> #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
> extern unsigned long max_mapnr;
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 24c045b24b95..373fbe377075 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -806,6 +806,10 @@ config VMAP_PFN
>
> config ARCH_USES_HIGH_VMA_FLAGS
> bool
> +
> +config ARCH_HAS_FIRST_USER_ADDRESS
> + bool
> +
> config ARCH_HAS_PKEYS
> bool
>
>
next prev parent reply other threads:[~2021-04-14 5:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 2:54 [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS Anshuman Khandual
2021-04-14 5:22 ` Christophe Leroy [this message]
2021-04-14 5:59 ` Anshuman Khandual
2021-04-14 6:10 ` Christophe Leroy
2021-04-15 4:40 ` Anshuman Khandual
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