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.deacon@arm.com>, 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>, "Ralf Baechle" <ralf@linux-mips.org>, "Paul Burton" <paul.burton@mips.com>, "James Hogan" <jhogan@kernel.org>, linux-mips@vger.kernel.org Subject: [PATCH v6 03/19] mips: mm: Add p?d_large() definitions Date: Tue, 26 Mar 2019 16:26:08 +0000 [thread overview] Message-ID: <20190326162624.20736-4-steven.price@arm.com> (raw) In-Reply-To: <20190326162624.20736-1-steven.price@arm.com> walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information is provided by the p?d_large() functions/macros. For mips, we only support large pages on 64 bit. For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no large pages in existence and fall back on the generic implementation (added in a later patch) which returns 0. CC: Ralf Baechle <ralf@linux-mips.org> CC: Paul Burton <paul.burton@mips.com> CC: James Hogan <jhogan@kernel.org> CC: linux-mips@vger.kernel.org Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Paul Burton <paul.burton@mips.com> --- arch/mips/include/asm/pgtable-64.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 93a9dce31f25..42162877ac62 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) return pmd_val(pmd) != (unsigned long) invalid_pte_table; } +#ifdef _PAGE_HUGE +#define pmd_large(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#endif + static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) return pud_val(pud) != (unsigned long) invalid_pmd_table; } +#ifdef _PAGE_HUGE +#define pud_large(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + static inline void pud_clear(pud_t *pudp) { pud_val(*pudp) = ((unsigned long) invalid_pmd_table); -- 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>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Will Deacon" <will.deacon@arm.com>, linux-mips@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>, "Liang, Kan" <kan.liang@linux.intel.com>, x86@kernel.org, "Steven Price" <steven.price@arm.com>, "Ingo Molnar" <mingo@redhat.com>, "James Hogan" <jhogan@kernel.org>, "Arnd Bergmann" <arnd@arndb.de>, "Jérôme Glisse" <jglisse@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "Thomas Gleixner" <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, linux-kernel@vger.kernel.org, "Ralf Baechle" <ralf@linux-mips.org>, "Paul Burton" <paul.burton@mips.com>, "James Morse" <james.morse@arm.com> Subject: [PATCH v6 03/19] mips: mm: Add p?d_large() definitions Date: Tue, 26 Mar 2019 16:26:08 +0000 [thread overview] Message-ID: <20190326162624.20736-4-steven.price@arm.com> (raw) In-Reply-To: <20190326162624.20736-1-steven.price@arm.com> walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information is provided by the p?d_large() functions/macros. For mips, we only support large pages on 64 bit. For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no large pages in existence and fall back on the generic implementation (added in a later patch) which returns 0. CC: Ralf Baechle <ralf@linux-mips.org> CC: Paul Burton <paul.burton@mips.com> CC: James Hogan <jhogan@kernel.org> CC: linux-mips@vger.kernel.org Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Paul Burton <paul.burton@mips.com> --- arch/mips/include/asm/pgtable-64.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 93a9dce31f25..42162877ac62 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) return pmd_val(pmd) != (unsigned long) invalid_pte_table; } +#ifdef _PAGE_HUGE +#define pmd_large(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#endif + static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) return pud_val(pud) != (unsigned long) invalid_pmd_table; } +#ifdef _PAGE_HUGE +#define pud_large(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + static inline void pud_clear(pud_t *pudp) { pud_val(*pudp) = ((unsigned long) invalid_pmd_table); -- 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:[~2019-03-26 16:26 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-26 16:26 [PATCH v6 00/19] Convert x86 & arm64 to use generic page walk Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 01/19] arc: mm: Add p?d_large() definitions Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 02/19] arm64: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price [this message] 2019-03-26 16:26 ` [PATCH v6 03/19] mips: " Steven Price 2019-03-26 16:26 ` [PATCH v6 04/19] powerpc: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-26 16:58 ` Christophe Leroy 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-28 11:00 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 05/19] riscv: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 06/19] s390: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 07/19] sparc: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 08/19] x86: " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 09/19] mm: Add generic p?d_large() macros Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 10/19] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 11/19] mm: pagewalk: Allow walking without vma Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 12/19] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 13/19] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 14/19] x86: mm: Don't display pages which aren't present in debugfs Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 15/19] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 16/19] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 17/19] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 18/19] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-03-26 16:26 ` Steven Price 2019-03-26 16:26 ` [PATCH v6 19/19] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-03-26 16:26 ` Steven Price
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