From: Kiryl Shutsemau <kas@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
Muchun Song <muchun.song@linux.dev>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Usama Arif <usamaarif642@gmail.com>,
Frank van der Linden <fvdl@google.com>
Cc: Oscar Salvador <osalvador@suse.de>,
Mike Rapoport <rppt@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Zi Yan <ziy@nvidia.com>, Baoquan He <bhe@redhat.com>,
Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Corbet <corbet@lwn.net>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>,
kernel-team@meta.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
loongarch@lists.linux.dev, linux-riscv@lists.infradead.org,
Kiryl Shutsemau <kas@kernel.org>
Subject: [PATCHv5 06/17] LoongArch/mm: Align vmemmap to maximal folio size
Date: Wed, 28 Jan 2026 13:54:47 +0000 [thread overview]
Message-ID: <20260128135500.22121-7-kas@kernel.org> (raw)
In-Reply-To: <20260128135500.22121-1-kas@kernel.org>
The upcoming change to the HugeTLB vmemmap optimization (HVO) requires
struct pages of the head page to be naturally aligned with regard to the
folio size.
Align vmemmap to MAX_FOLIO_NR_PAGES.
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
---
arch/loongarch/include/asm/pgtable.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index c33b3bcb733e..f9416acb9156 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -113,7 +113,8 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
#endif
-#define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
+#define VMEMMAP_ALIGN max(PMD_SIZE, MAX_FOLIO_NR_PAGES * sizeof(struct page))
+#define vmemmap ((struct page *)(ALIGN(VMALLOC_END, VMEMMAP_ALIGN)))
#define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
#define KFENCE_AREA_START (VMEMMAP_END + 1)
--
2.51.2
next prev parent reply other threads:[~2026-01-28 13:56 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-28 13:54 [PATCHv5 00/17] mm: Eliminate fake head pages from vmemmap optimization Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 01/17] mm: Move MAX_FOLIO_ORDER definition to mmzone.h Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 02/17] mm: Change the interface of prep_compound_tail() Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 03/17] mm: Rename the 'compound_head' field in the 'struct page' to 'compound_info' Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 04/17] mm: Move set/clear_compound_head() next to compound_head() Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 05/17] riscv/mm: Align vmemmap to maximal folio size Kiryl Shutsemau
2026-01-28 13:54 ` Kiryl Shutsemau [this message]
2026-01-28 13:54 ` [PATCHv5 07/17] mm: Rework compound_head() for power-of-2 sizeof(struct page) Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 08/17] mm: Make page_zonenum() use head page Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 09/17] mm/sparse: Check memmap alignment for compound_info_has_mask() Kiryl Shutsemau
2026-01-29 3:00 ` Muchun Song
2026-01-29 3:10 ` Zi Yan
2026-01-29 3:23 ` Muchun Song
2026-01-29 3:29 ` Zi Yan
2026-01-29 7:03 ` Muchun Song
2026-01-29 17:33 ` Zi Yan
2026-01-28 13:54 ` [PATCHv5 10/17] mm/hugetlb: Refactor code around vmemmap_walk Kiryl Shutsemau
2026-01-29 2:51 ` Muchun Song
2026-01-28 13:54 ` [PATCHv5 11/17] mm/hugetlb: Remove fake head pages Kiryl Shutsemau
2026-01-29 6:54 ` Muchun Song
2026-01-28 13:54 ` [PATCHv5 12/17] mm: Drop fake head checks Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 13/17] hugetlb: Remove VMEMMAP_SYNCHRONIZE_RCU Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 14/17] mm/hugetlb: Remove hugetlb_optimize_vmemmap_key static key Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 15/17] mm: Remove the branch from compound_head() Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 16/17] hugetlb: Update vmemmap_dedup.rst Kiryl Shutsemau
2026-01-28 13:54 ` [PATCHv5 17/17] mm/slab: Use compound_head() in page_slab() Kiryl Shutsemau
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