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riscv/mm: align vmemmap to maximal folio size 

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 the newly introduced MAX_FOLIO_VMEMMAP_ALIGN.

Link: https://lkml.kernel.org/r/20260227194302.274384-6-kas@kernel.org
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Baoquan He <bhe@redhat.com>
Cc: Christoph Lameter <cl@gentwo.org>
Cc: David Hildenbrand (arm) <david@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Harry Yoo <harry.yoo@oracle.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
master
Kiryl Shutsemau 2026-02-27 19:42:43 +00:00 committed by Andrew Morton
parent 67c79a5af0
commit 476849b0fb
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/riscv/mm/init.c
View File

@ -63,7 +63,8 @@ phys_addr_t phys_ram_base __ro_after_init;
EXPORT_SYMBOL(phys_ram_base);
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#define VMEMMAP_ADDR_ALIGN (1ULL << SECTION_SIZE_BITS)
#define VMEMMAP_ADDR_ALIGN max(1ULL << SECTION_SIZE_BITS, \
MAX_FOLIO_VMEMMAP_ALIGN)
unsigned long vmemmap_start_pfn __ro_after_init;
EXPORT_SYMBOL(vmemmap_start_pfn);

11
include/linux/mmzone.h
View File

@ -92,6 +92,17 @@
#define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER)
/*
* HugeTLB Vmemmap Optimization (HVO) requires struct pages of the head page to
* be naturally aligned with regard to the folio size.
*
* HVO which is only active if the size of struct page is a power of 2.
*/
#define MAX_FOLIO_VMEMMAP_ALIGN \
(IS_ENABLED(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP) && \
is_power_of_2(sizeof(struct page)) ? \
MAX_FOLIO_NR_PAGES * sizeof(struct page) : 0)
enum migratetype {
MIGRATE_UNMOVABLE,
MIGRATE_MOVABLE,