From: Steven Price <steven.price@arm.com>
To: Andrew Morton <akpm@linux-foundation.org>, 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>,
"Ralf Baechle" <ralf@linux-mips.org>,
"Paul Burton" <paul.burton@mips.com>,
"James Hogan" <jhogan@kernel.org>,
linux-mips@vger.kernel.org
Subject: [PATCH v16 05/25] mips: mm: Add p?d_leaf() definitions
Date: Fri, 6 Dec 2019 13:52:56 +0000 [thread overview]
Message-ID: <20191206135316.47703-6-steven.price@arm.com> (raw)
In-Reply-To: <20191206135316.47703-1-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_leaf() functions/macros.
If _PAGE_HUGE is defined we can simply look for it. When not defined we
can be confident that there are no leaf 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.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 91b89aab1787..aef5378f909c 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -639,6 +639,11 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#ifdef _PAGE_HUGE
+#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
+#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
+#endif
+
#define gup_fast_permitted(start, end) (!cpu_has_dc_aliases)
#include <asm-generic/pgtable.h>
--
2.20.1
next prev parent reply other threads:[~2019-12-06 13:54 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-06 13:52 [PATCH v16 00/25] Generic page walk and ptdump Steven Price
2019-12-06 13:52 ` [PATCH v16 01/25] mm: Add generic p?d_leaf() macros Steven Price
2019-12-06 13:52 ` [PATCH v16 02/25] arc: mm: Add p?d_leaf() definitions Steven Price
2019-12-06 13:52 ` [PATCH v16 03/25] arm: " Steven Price
2019-12-06 13:52 ` [PATCH v16 04/25] arm64: " Steven Price
2019-12-06 13:52 ` Steven Price [this message]
2019-12-06 13:52 ` [PATCH v16 06/25] powerpc: " Steven Price
2019-12-09 11:08 ` Michael Ellerman
2019-12-09 13:06 ` Steven Price
2019-12-06 13:52 ` [PATCH v16 07/25] riscv: " Steven Price
2019-12-06 13:52 ` [PATCH v16 08/25] s390: " Steven Price
2019-12-06 13:53 ` [PATCH v16 09/25] sparc: " Steven Price
2019-12-06 13:53 ` [PATCH v16 10/25] x86: " Steven Price
2019-12-06 13:53 ` [PATCH v16 11/25] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-12-12 11:23 ` Thomas Hellström (VMware)
2019-12-12 11:33 ` Thomas Hellström (VMware)
2019-12-12 13:15 ` Steven Price
2019-12-12 14:04 ` Thomas Hellström (VMware)
2019-12-12 15:18 ` Steven Price
2019-12-06 13:53 ` [PATCH v16 12/25] mm: pagewalk: Allow walking without vma Steven Price
2019-12-06 13:53 ` [PATCH v16 13/25] mm: pagewalk: Don't lock PTEs for walk_page_range_novma() Steven Price
2019-12-10 11:23 ` kbuild test robot
2019-12-11 15:54 ` Steven Price
2019-12-11 17:12 ` Luc Van Oostenryck
2019-12-11 17:19 ` Qian Cai
2019-12-06 13:53 ` [PATCH v16 14/25] mm: pagewalk: fix termination condition in walk_pte_range() Steven Price
2019-12-06 13:53 ` [PATCH v16 15/25] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-12-06 13:53 ` [PATCH v16 16/25] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-12-06 13:53 ` [PATCH v16 17/25] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-12-06 13:53 ` [PATCH v16 18/25] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-12-06 13:53 ` [PATCH v16 19/25] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-12-06 13:53 ` [PATCH v16 20/25] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-12-06 13:53 ` [PATCH v16 21/25] mm: Add generic ptdump Steven Price
2019-12-06 13:53 ` [PATCH v16 22/25] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price
2019-12-06 13:53 ` [PATCH v16 23/25] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-12-06 13:53 ` [PATCH v16 24/25] arm64: mm: Display non-present entries in ptdump Steven Price
2019-12-06 13:53 ` [PATCH v16 25/25] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price
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