From: Steven Price <steven.price@arm.com> To: linux-mm@kvack.org Cc: "Steven Price" <steven.price@arm.com>, "Andy Lutomirski" <luto@kernel.org>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Ingo Molnar" <mingo@redhat.com>, "James Morse" <james.morse@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Peter Zijlstra" <peterz@infradead.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Mark Rutland" <Mark.Rutland@arm.com>, "Liang, Kan" <kan.liang@linux.intel.com>, "Andrew Morton" <akpm@linux-foundation.org>, "Mark Rutland" <mark.rutland@arm.com> Subject: [PATCH v12 01/22] mm: Add generic p?d_leaf() macros Date: Fri, 18 Oct 2019 11:12:27 +0100 [thread overview] Message-ID: <20191018101248.33727-2-steven.price@arm.com> (raw) In-Reply-To: <20191018101248.33727-1-steven.price@arm.com> Exposing the pud/pgd levels of the page tables to walk_page_range() means we may come across the exotic large mappings that come with large areas of contiguous memory (such as the kernel's linear map). For architectures that don't provide all p?d_leaf() macros, provide generic do nothing default that are suitable where there cannot be leaf pages at that level. Futher patches will add implementations for individual architectures. The name p?d_leaf() is chosen to minimize the confusion with existing uses of "large" pages and "huge" pages which do not necessary mean that the entry is a leaf (for example it may be a set of contiguous entries that only take 1 TLB slot). For the purpose of walking the page tables we don't need to know how it will be represented in the TLB, but we do need to know for sure if it is a leaf of the tree. Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> --- include/asm-generic/pgtable.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 818691846c90..7f9eced287b7 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1187,4 +1187,24 @@ static inline bool arch_has_pfn_modify_check(void) #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) #endif +/* + * p?d_leaf() - true if this entry is a final mapping to a physical address. + * This differs from p?d_huge() by the fact that they are always available (if + * the architecture supports large pages at the appropriate level) even + * if CONFIG_HUGETLB_PAGE is not defined. + * Only meaningful when called on a valid entry. + */ +#ifndef pgd_leaf +#define pgd_leaf(x) 0 +#endif +#ifndef p4d_leaf +#define p4d_leaf(x) 0 +#endif +#ifndef pud_leaf +#define pud_leaf(x) 0 +#endif +#ifndef pmd_leaf +#define pmd_leaf(x) 0 +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: linux-mm@kvack.org Cc: "Mark Rutland" <mark.rutland@arm.com>, x86@kernel.org, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, linux-kernel@vger.kernel.org, "Steven Price" <steven.price@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, "Andrew Morton" <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v12 01/22] mm: Add generic p?d_leaf() macros Date: Fri, 18 Oct 2019 11:12:27 +0100 [thread overview] Message-ID: <20191018101248.33727-2-steven.price@arm.com> (raw) In-Reply-To: <20191018101248.33727-1-steven.price@arm.com> Exposing the pud/pgd levels of the page tables to walk_page_range() means we may come across the exotic large mappings that come with large areas of contiguous memory (such as the kernel's linear map). For architectures that don't provide all p?d_leaf() macros, provide generic do nothing default that are suitable where there cannot be leaf pages at that level. Futher patches will add implementations for individual architectures. The name p?d_leaf() is chosen to minimize the confusion with existing uses of "large" pages and "huge" pages which do not necessary mean that the entry is a leaf (for example it may be a set of contiguous entries that only take 1 TLB slot). For the purpose of walking the page tables we don't need to know how it will be represented in the TLB, but we do need to know for sure if it is a leaf of the tree. Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> --- include/asm-generic/pgtable.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 818691846c90..7f9eced287b7 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1187,4 +1187,24 @@ static inline bool arch_has_pfn_modify_check(void) #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) #endif +/* + * p?d_leaf() - true if this entry is a final mapping to a physical address. + * This differs from p?d_huge() by the fact that they are always available (if + * the architecture supports large pages at the appropriate level) even + * if CONFIG_HUGETLB_PAGE is not defined. + * Only meaningful when called on a valid entry. + */ +#ifndef pgd_leaf +#define pgd_leaf(x) 0 +#endif +#ifndef p4d_leaf +#define p4d_leaf(x) 0 +#endif +#ifndef pud_leaf +#define pud_leaf(x) 0 +#endif +#ifndef pmd_leaf +#define pmd_leaf(x) 0 +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-10-18 10:13 UTC|newest] Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-18 10:12 [PATCH v12 00/22] Generic page walk and ptdump Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price [this message] 2019-10-18 10:12 ` [PATCH v12 01/22] mm: Add generic p?d_leaf() macros Steven Price 2019-10-18 10:12 ` [PATCH v12 02/22] arc: mm: Add p?d_leaf() definitions Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 03/22] arm: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 04/22] arm64: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 05/22] mips: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 06/22] powerpc: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 07/22] riscv: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 15:57 ` Christoph Hellwig 2019-10-18 15:57 ` Christoph Hellwig 2019-10-18 15:57 ` Christoph Hellwig 2019-10-18 16:20 ` Steven Price 2019-10-18 16:20 ` Steven Price 2019-10-18 16:20 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 08/22] s390: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 09/22] sparc: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 10/22] x86: " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 11/22] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-24 13:06 ` Zong Li 2019-10-24 13:06 ` Zong Li 2019-10-18 10:12 ` [PATCH v12 12/22] mm: pagewalk: Allow walking without vma Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-24 13:05 ` Zong Li 2019-10-24 13:05 ` Zong Li 2019-10-18 10:12 ` [PATCH v12 13/22] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-24 13:06 ` Zong Li 2019-10-24 13:06 ` Zong Li 2019-10-18 10:12 ` [PATCH v12 14/22] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-24 13:07 ` Zong Li 2019-10-24 13:07 ` Zong Li 2019-10-18 10:12 ` [PATCH v12 15/22] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 16/22] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 17/22] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 18/22] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 19/22] mm: Add generic ptdump Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 20/22] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 21/22] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-10-18 10:12 ` Steven Price 2019-10-18 10:12 ` [PATCH v12 22/22] arm64: mm: Display non-present entries in ptdump Steven Price 2019-10-18 10:12 ` Steven Price
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