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If that's the case, expose them to the page allocator as MIGRATE_MOVABLE pages. MIGRATE_MOVABLE has been chosen because the bulk of memory allocations comes from userspace, and the migratetype for those allocations is MIGRATE_MOVABLE. MIGRATE_RECLAIMABLE and MIGRATE_UNMOVABLE requests can still use the pages as a fallback. Signed-off-by: Alexandru Elisei --- arch/arm64/kernel/mte_tag_storage.c | 18 ++++++++++++++++++ include/linux/gfp.h | 2 ++ mm/mm_init.c | 3 +-- 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/mte_tag_storage.c b/arch/arm64/kernel/mte_tag_storage.c index 87160f53960f..4a6bfdf88458 100644 --- a/arch/arm64/kernel/mte_tag_storage.c +++ b/arch/arm64/kernel/mte_tag_storage.c @@ -296,6 +296,24 @@ static int __init mte_tag_storage_activate_regions(void) } } + /* + * MTE disabled, tag storage pages can be used like any other pages. The + * only restriction is that the pages cannot be used by kexec because + * the memory is marked as reserved in the memblock allocator. + */ + if (!system_supports_mte()) { + for (i = 0; i< num_tag_regions; i++) { + tag_range = &tag_regions[i].tag_range; + for (pfn = tag_range->start; + pfn <= tag_range->end; + pfn += pageblock_nr_pages) { + init_reserved_pageblock(pfn_to_page(pfn), MIGRATE_MOVABLE); + } + } + + return 0; + } + for (i = 0; i < num_tag_regions; i++) { tag_range = &tag_regions[i].tag_range; for (pfn = tag_range->start; pfn <= tag_range->end; pfn += pageblock_nr_pages) { diff --git a/include/linux/gfp.h b/include/linux/gfp.h index fb344baa9a9b..622bb9406cae 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -354,6 +354,8 @@ extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask, #endif void free_contig_range(unsigned long pfn, unsigned long nr_pages); +extern void init_reserved_pageblock(struct page *page, enum migratetype migratetype); + #ifdef CONFIG_MEMORY_METADATA extern void init_metadata_reserved_pageblock(struct page *page); #else diff --git a/mm/mm_init.c b/mm/mm_init.c index 467c80e9dacc..eedaacdf153d 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2330,8 +2330,7 @@ bool __init deferred_grow_zone(struct zone *zone, unsigned int order) #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ #if defined(CONFIG_CMA) || defined(CONFIG_MEMORY_METADATA) -static void __init init_reserved_pageblock(struct page *page, - enum migratetype migratetype) +void __init init_reserved_pageblock(struct page *page, enum migratetype migratetype) { unsigned i = pageblock_nr_pages; struct page *p = page; -- 2.41.0