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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>
Subject: [PATCH v4 09/19] mm: Add generic p?d_large() macros
Date: Wed,  6 Mar 2019 15:50:21 +0000	[thread overview]
Message-ID: <20190306155031.4291-10-steven.price@arm.com> (raw)
In-Reply-To: <20190306155031.4291-1-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 p?d_large() macros, provide generic
does nothing defaults.

Signed-off-by: Steven Price <steven.price@arm.com>
---
 include/asm-generic/pgtable.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 05e61e6c843f..f0de24100ac6 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -1186,4 +1186,23 @@ static inline bool arch_has_pfn_modify_check(void)
 #define mm_pmd_folded(mm)	__is_defined(__PAGETABLE_PMD_FOLDED)
 #endif
 
+/*
+ * p?d_large() - 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.
+ */
+#ifndef pgd_large
+#define pgd_large(x)	0
+#endif
+#ifndef p4d_large
+#define p4d_large(x)	0
+#endif
+#ifndef pud_large
+#define pud_large(x)	0
+#endif
+#ifndef pmd_large
+#define pmd_large(x)	0
+#endif
+
 #endif /* _ASM_GENERIC_PGTABLE_H */
-- 
2.20.1


  parent reply	other threads:[~2019-03-06 15:51 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-06 15:50 [PATCH v4 00/19] Convert x86 & arm64 to use generic page walk Steven Price
2019-03-06 15:50 ` [PATCH v4 01/19] arc: mm: Add p?d_large() definitions Steven Price
2019-03-06 15:50 ` [PATCH v4 02/19] arm64: " Steven Price
2019-03-06 15:50 ` [PATCH v4 03/19] mips: " Steven Price
2019-03-06 17:12   ` Paul Burton
2019-03-06 15:50 ` [PATCH v4 04/19] powerpc: " Steven Price
2019-03-08  8:37   ` Mike Rapoport
2019-03-08 10:50     ` Steven Price
2019-03-06 15:50 ` [PATCH v4 05/19] riscv: " Steven Price
2019-03-06 15:50 ` [PATCH v4 06/19] s390: " Steven Price
2019-03-06 15:50 ` [PATCH v4 07/19] sparc: " Steven Price
2019-03-06 19:02   ` David Miller
2019-03-06 15:50 ` [PATCH v4 08/19] x86: " Steven Price
2019-03-06 15:50 ` Steven Price [this message]
2019-03-06 15:50 ` [PATCH v4 10/19] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-03-06 15:50 ` [PATCH v4 11/19] mm: pagewalk: Allow walking without vma Steven Price
2019-03-06 15:50 ` [PATCH v4 12/19] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-03-06 15:50 ` [PATCH v4 13/19] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-03-06 15:50 ` [PATCH v4 14/19] x86: mm: Don't display pages which aren't present in debugfs Steven Price
2019-03-06 15:50 ` [PATCH v4 15/19] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-03-06 15:50 ` [PATCH v4 16/19] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-03-06 15:50 ` [PATCH v4 17/19] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-03-06 15:50 ` [PATCH v4 18/19] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-03-06 15:50 ` [PATCH v4 19/19] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price

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