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

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Message-ID: <20240227074116.6127-A-hca@linux.ibm.com>
Date: Tue, 27 Feb 2024 08:41:16 +0100
From: Heiko Carstens <hca@...ux.ibm.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,
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        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,
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        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/s390/Kconfig                  | 1 +
>  arch/s390/include/asm/page.h       | 2 +-
..
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index fe565f3a3a91..b61c74c10050 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -199,6 +199,7 @@ config S390
>  	select HAVE_MOD_ARCH_SPECIFIC
>  	select HAVE_NMI
>  	select HAVE_NOP_MCOUNT
> +	select HAVE_PAGE_SIZE_4KB
>  	select HAVE_PCI
>  	select HAVE_PERF_EVENTS
>  	select HAVE_PERF_REGS
> diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
> index 73b9c3bf377f..ded9548d11d9 100644
> --- a/arch/s390/include/asm/page.h
> +++ b/arch/s390/include/asm/page.h
> @@ -11,7 +11,7 @@
>  #include <linux/const.h>
>  #include <asm/types.h>
>  
> -#define _PAGE_SHIFT	12
> +#define _PAGE_SHIFT	CONFIG_PAGE_SHIFT

Acked-by: Heiko Carstens <hca@...ux.ibm.com>