From: Matthew Wilcox <willy@infradead.org>
To: linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Russell King <linux@armlinux.org.uk>,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-m68k@lists.linux-m68k.org
Subject: [PATCH 1/7] mm: Document x86 uses a linked list of pgds
Date: Tue, 28 Apr 2020 12:44:43 -0700 [thread overview]
Message-ID: <20200428194449.22615-2-willy@infradead.org> (raw)
In-Reply-To: <20200428194449.22615-1-willy@infradead.org>
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
x86 uses page->lru of the pages used for pgds, but that's not immediately
obvious to anyone looking to make changes. Add a struct list_head to
the union so it's clearly in use for pgds.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/mm_types.h | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4aba6c0c2ba8..9bb34e2cd5a5 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -142,8 +142,13 @@ struct page {
struct list_head deferred_list;
};
struct { /* Page table pages */
- unsigned long _pt_pad_1; /* compound_head */
- pgtable_t pmd_huge_pte; /* protected by page->ptl */
+ union {
+ struct list_head pgd_list; /* x86 */
+ struct {
+ unsigned long _pt_pad_1;
+ pgtable_t pmd_huge_pte;
+ };
+ };
unsigned long _pt_pad_2; /* mapping */
union {
struct mm_struct *pt_mm; /* x86 pgds only */
--
2.26.2
next prev parent reply other threads:[~2020-04-28 19:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 19:44 [PATCH 0/7] Record the mm_struct in the page table pages Matthew Wilcox
2020-04-28 19:44 ` Matthew Wilcox [this message]
2020-04-28 21:41 ` [PATCH 1/7] mm: Document x86 uses a linked list of pgds Ira Weiny
2020-04-28 22:52 ` Matthew Wilcox
2020-04-29 18:29 ` Ira Weiny
2020-04-28 19:44 ` [PATCH 2/7] mm: Move pt_mm within struct page Matthew Wilcox
2020-04-29 7:34 ` Geert Uytterhoeven
2020-04-29 12:53 ` Matthew Wilcox
2020-04-28 19:44 ` [PATCH 3/7] arm: Thread mm_struct throughout page table allocation Matthew Wilcox
2020-04-28 19:44 ` [PATCH 4/7] arm64: " Matthew Wilcox
2020-04-29 9:58 ` Mark Rutland
2020-04-28 19:44 ` [PATCH 5/7] m68k: " Matthew Wilcox
2020-04-29 7:44 ` Geert Uytterhoeven
2020-04-28 19:44 ` [PATCH 6/7] mm: Set pt_mm in PTE constructor Matthew Wilcox
2020-04-29 7:46 ` Geert Uytterhoeven
2020-04-28 19:44 ` [PATCH 7/7] mm: Set pt_mm in PMD constructor Matthew Wilcox
2020-04-29 0:52 ` Kirill A. Shutemov
2020-04-29 0:26 ` [PATCH 0/7] Record the mm_struct in the page table pages Kirill A. Shutemov
2020-04-29 1:51 ` Matthew Wilcox
2020-05-24 7:42 ` Mike Rapoport
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