linux-kernel - Re: [PATCH 3/4] arch: define CONFIG_PAGE_SIZE

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Date: Wed, 28 Feb 2024 21:06:21 +0000
From: Stafford Horne <shorne@...il.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Kees Cook <keescook@...omium.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>, Matt Turner <mattst88@...il.com>,
	Vineet Gupta <vgupta@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Guo Ren <guoren@...nel.org>, Brian Cain <bcain@...cinc.com>,
	Huacai Chen <chenhuacai@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Michal Simek <monstr@...str.eu>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Helge Deller <deller@....de>, Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Palmer Dabbelt <palmer@...belt.com>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Andreas Larsson <andreas@...sler.com>,
	Richard Weinberger <richard@....at>, x86@...nel.org,
	Max Filippov <jcmvbkbc@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Kieran Bingham <kbingham@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
	linux-snps-arc@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
	linux-hexagon@...r.kernel.org, loongarch@...ts.linux.dev,
	linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
	linux-openrisc@...r.kernel.org, linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-um@...ts.infradead.org
Subject: Re: [PATCH 3/4] arch: define CONFIG_PAGE_SIZE_*KB on all
 architectures

On Mon, Feb 26, 2024 at 05:14:13PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Most architectures only support a single hardcoded page size. In order
> to ensure that each one of these sets the corresponding Kconfig symbols,
> change over the PAGE_SHIFT definition to the common one and allow
> only the hardware page size to be selected.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/alpha/Kconfig                 | 1 +
>  arch/alpha/include/asm/page.h      | 2 +-
>  arch/arm/Kconfig                   | 1 +
>  arch/arm/include/asm/page.h        | 2 +-
>  arch/csky/Kconfig                  | 1 +
>  arch/csky/include/asm/page.h       | 2 +-
>  arch/m68k/Kconfig                  | 3 +++
>  arch/m68k/Kconfig.cpu              | 2 ++
>  arch/m68k/include/asm/page.h       | 6 +-----
>  arch/microblaze/Kconfig            | 1 +
>  arch/microblaze/include/asm/page.h | 2 +-
>  arch/nios2/Kconfig                 | 1 +
>  arch/nios2/include/asm/page.h      | 2 +-
>  arch/openrisc/Kconfig              | 1 +
>  arch/openrisc/include/asm/page.h   | 2 +-
>  arch/riscv/Kconfig                 | 1 +
>  arch/riscv/include/asm/page.h      | 2 +-
>  arch/s390/Kconfig                  | 1 +
>  arch/s390/include/asm/page.h       | 2 +-
>  arch/sparc/Kconfig                 | 2 ++
>  arch/sparc/include/asm/page_32.h   | 2 +-
>  arch/sparc/include/asm/page_64.h   | 3 +--
>  arch/um/Kconfig                    | 1 +
>  arch/um/include/asm/page.h         | 2 +-
>  arch/x86/Kconfig                   | 1 +
>  arch/x86/include/asm/page_types.h  | 2 +-
>  arch/xtensa/Kconfig                | 1 +
>  arch/xtensa/include/asm/page.h     | 2 +-
>  28 files changed, 32 insertions(+), 19 deletions(-)
...
> diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
> index fd9bb76a610b..3586cda55bde 100644
> --- a/arch/openrisc/Kconfig
> +++ b/arch/openrisc/Kconfig
> @@ -25,6 +25,7 @@ config OPENRISC
>  	select GENERIC_CPU_DEVICES
>  	select HAVE_PCI
>  	select HAVE_UID16
> +	select HAVE_PAGE_SIZE_8KB
>  	select GENERIC_ATOMIC64
>  	select GENERIC_CLOCKEVENTS_BROADCAST
>  	select GENERIC_SMP_IDLE_THREAD
> diff --git a/arch/openrisc/include/asm/page.h b/arch/openrisc/include/asm/page.h
> index 44fc1fd56717..7925ce09ab5a 100644
> --- a/arch/openrisc/include/asm/page.h
> +++ b/arch/openrisc/include/asm/page.h
> @@ -18,7 +18,7 @@
>  
>  /* PAGE_SHIFT determines the page size */
>  
> -#define PAGE_SHIFT      13
> +#define PAGE_SHIFT      CONFIG_PAGE_SHIFT
>  #ifdef __ASSEMBLY__
>  #define PAGE_SIZE       (1 << PAGE_SHIFT)
>  #else

For the openrisc bits,

Acked-by: Stafford Horne <shorne@...il.com>