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Date: Thu, 29 Jun 2023 20:55:02 +0800
From: WANG Xuerui <kernel@...0n.name>
To: Thomas Zimmermann <tzimmermann@...e.de>, arnd@...db.de,
deller@....de, daniel@...ll.ch, airlied@...il.com
Cc: linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-efi@...r.kernel.org,
linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
linux-ia64@...r.kernel.org, loongarch@...ts.linux.dev,
linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-hyperv@...r.kernel.org, linux-fbdev@...r.kernel.org,
linux-staging@...ts.linux.dev, linux-arch@...r.kernel.org,
Richard Henderson <richard.henderson@...aro.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Matt Turner <mattst88@...il.com>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
Brian Cain <bcain@...cinc.com>,
Huacai Chen <chenhuacai@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Dinh Nguyen <dinguyen@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
"David S. Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
Max Filippov <jcmvbkbc@...il.com>,
Kees Cook <keescook@...omium.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <frederic@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ard Biesheuvel <ardb@...nel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
Juerg Haefliger <juerg.haefliger@...onical.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Anshuman Khandual <anshuman.khandual@....com>,
Niklas Schnelle <schnelle@...ux.ibm.com>,
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
Linus Walleij <linus.walleij@...aro.org>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
"Mike Rapoport (IBM)" <rppt@...nel.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH 06/12] arch: Declare screen_info in <asm/screen_info.h>
On 2023/6/29 19:45, Thomas Zimmermann wrote:
> The variable screen_info does not exist on all architectures. Declare
> it in <asm-generic/screen_info.h>. All architectures that do declare it
> will provide it via <asm/screen_info.h>.
>
> Add the Kconfig token ARCH_HAS_SCREEN_INFO to guard against access on
> architectures that don't provide screen_info.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Richard Henderson <richard.henderson@...aro.org>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Matt Turner <mattst88@...il.com>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Guo Ren <guoren@...nel.org>
> Cc: Brian Cain <bcain@...cinc.com>
> Cc: Huacai Chen <chenhuacai@...nel.org>
> Cc: WANG Xuerui <kernel@...0n.name>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Dinh Nguyen <dinguyen@...nel.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> 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: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: x86@...nel.org
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Chris Zankel <chris@...kel.net>
> Cc: Max Filippov <jcmvbkbc@...il.com>
> Cc: Helge Deller <deller@....de>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Frederic Weisbecker <frederic@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Sami Tolvanen <samitolvanen@...gle.com>
> Cc: Juerg Haefliger <juerg.haefliger@...onical.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Anshuman Khandual <anshuman.khandual@....com>
> Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
> Cc: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Sebastian Reichel <sebastian.reichel@...labora.com>
> Cc: "Mike Rapoport (IBM)" <rppt@...nel.org>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: Zi Yan <ziy@...dia.com>
> ---
> arch/Kconfig | 6 ++++++
> arch/alpha/Kconfig | 1 +
> arch/arm/Kconfig | 1 +
> arch/arm64/Kconfig | 1 +
> arch/csky/Kconfig | 1 +
> arch/hexagon/Kconfig | 1 +
> arch/ia64/Kconfig | 1 +
> arch/loongarch/Kconfig | 1 +
> arch/mips/Kconfig | 1 +
> arch/nios2/Kconfig | 1 +
> arch/powerpc/Kconfig | 1 +
> arch/riscv/Kconfig | 1 +
> arch/sh/Kconfig | 1 +
> arch/sparc/Kconfig | 1 +
> arch/x86/Kconfig | 1 +
> arch/xtensa/Kconfig | 1 +
> drivers/video/Kconfig | 3 +++
> include/asm-generic/Kbuild | 1 +
> include/asm-generic/screen_info.h | 12 ++++++++++++
> include/linux/screen_info.h | 2 +-
> 20 files changed, 38 insertions(+), 1 deletion(-)
> create mode 100644 include/asm-generic/screen_info.h
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 205fd23e0cada..2f58293fd7bcb 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -1466,6 +1466,12 @@ config ARCH_HAS_NONLEAF_PMD_YOUNG
> address translations. Page table walkers that clear the accessed bit
> may use this capability to reduce their search space.
>
> +config ARCH_HAS_SCREEN_INFO
> + bool
> + help
> + Selected by architectures that provide a global instance of
> + screen_info.
> +
> source "kernel/gcov/Kconfig"
>
> source "scripts/gcc-plugins/Kconfig"
> [snip]
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index d38b066fc931b..6aab2fb7753da 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -13,6 +13,7 @@ config LOONGARCH
> select ARCH_HAS_FORTIFY_SOURCE
> select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
> select ARCH_HAS_PTE_SPECIAL
> + select ARCH_HAS_SCREEN_INFO
> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> select ARCH_INLINE_READ_LOCK if !PREEMPTION
> select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
> [snip]
Acked-by: WANG Xuerui <git@...0n.name> # loongarch
Thanks!
--
WANG "xen0n" Xuerui
Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/
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