Date: Mon, 7 Aug 2017 19:35:55 +0100 From: Mark Rutland <mark.rutland@....com> To: linux-arm-kernel@...ts.infradead.org Cc: ard.biesheuvel@...aro.org, catalin.marinas@....com, james.morse@....com, labbott@...hat.com, linux-kernel@...r.kernel.org, luto@...capital.net, mark.rutland@....com, matt@...eblueprint.co.uk, will.deacon@....com, kernel-hardening@...ts.openwall.com, keescook@...omium.org Subject: [PATCH 04/14] arm64: factor out PAGE_* and CONT_* definitions Some headers rely on PAGE_* definitions from <asm/page.h>, but cannot include this due to potential circular includes. For example, a number of definitions in <asm/memory.h> rely on PAGE_SHIFT, and <asm/page.h> includes <asm/memory.h>. This requires users of these definitions to include both headers, which is fragile and error-prone. This patch ameliorates matters by moving the basic definitions out to a new header, <asm/page-def.h>. Both <asm/page.h> and <asm/memory.h> are updated to include this, avoiding this fragility, and avoiding the possibility of circular include dependencies. Signed-off-by: Mark Rutland <mark.rutland@....com> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org> Cc: Catalin Marinas <catalin.marinas@....com> Cc: James Morse <james.morse@....com> Cc: Laura Abbott <labbott@...hat.com> Cc: Will Deacon <will.deacon@....com> --- arch/arm64/include/asm/memory.h | 1 + arch/arm64/include/asm/page-def.h | 34 ++++++++++++++++++++++++++++++++++ arch/arm64/include/asm/page.h | 12 +----------- 3 files changed, 36 insertions(+), 11 deletions(-) create mode 100644 arch/arm64/include/asm/page-def.h diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 32f827233..77d55dc 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -25,6 +25,7 @@ #include <linux/const.h> #include <linux/types.h> #include <asm/bug.h> +#include <asm/page-def.h> #include <asm/sizes.h> /* diff --git a/arch/arm64/include/asm/page-def.h b/arch/arm64/include/asm/page-def.h new file mode 100644 index 0000000..01591a2 --- /dev/null +++ b/arch/arm64/include/asm/page-def.h @@ -0,0 +1,34 @@ +/* + * Based on arch/arm/include/asm/page.h + * + * Copyright (C) 1995-2003 Russell King + * Copyright (C) 2017 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_PAGE_DEF_H +#define __ASM_PAGE_DEF_H + +#include <linux/const.h> + +/* PAGE_SHIFT determines the page size */ +/* CONT_SHIFT determines the number of pages which can be tracked together */ +#define PAGE_SHIFT CONFIG_ARM64_PAGE_SHIFT +#define CONT_SHIFT CONFIG_ARM64_CONT_SHIFT +#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) +#define PAGE_MASK (~(PAGE_SIZE-1)) + +#define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT)) +#define CONT_MASK (~(CONT_SIZE-1)) + +#endif /* __ASM_PAGE_DEF_H */ diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h index 8472c6d..60d02c8 100644 --- a/arch/arm64/include/asm/page.h +++ b/arch/arm64/include/asm/page.h @@ -19,17 +19,7 @@ #ifndef __ASM_PAGE_H #define __ASM_PAGE_H -#include <linux/const.h> - -/* PAGE_SHIFT determines the page size */ -/* CONT_SHIFT determines the number of pages which can be tracked together */ -#define PAGE_SHIFT CONFIG_ARM64_PAGE_SHIFT -#define CONT_SHIFT CONFIG_ARM64_CONT_SHIFT -#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) -#define PAGE_MASK (~(PAGE_SIZE-1)) - -#define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT)) -#define CONT_MASK (~(CONT_SIZE-1)) +#include <asm/page-def.h> #ifndef __ASSEMBLY__ -- 1.9.1
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