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| author | Aneesh Kumar K.V <[email protected]> | 2023-07-24 19:07:49 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-08-18 17:12:53 +0000 |
| commit | c1a6c536fb088c01d6bdce77731d89ad5e1734c6 (patch) | |
| tree | bc883e4fee5037a319e88a98538e6cd0c475cb57 /mm/mm_init.c | |
| parent | mm: change pudp_huge_get_and_clear_full take vm_area_struct as arg (diff) | |
| download | kernel-c1a6c536fb088c01d6bdce77731d89ad5e1734c6.tar.gz kernel-c1a6c536fb088c01d6bdce77731d89ad5e1734c6.zip | |
mm/vmemmap: improve vmemmap_can_optimize and allow architectures to override
dax vmemmap optimization requires a minimum of 2 PAGE_SIZE area within
vmemmap such that tail page mapping can point to the second PAGE_SIZE
area. Enforce that in vmemmap_can_optimize() function.
Architectures like powerpc also want to enable vmemmap optimization
conditionally (only with radix MMU translation). Hence allow architecture
override.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Aneesh Kumar K.V <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Joao Martins <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'mm/mm_init.c')
| -rw-r--r-- | mm/mm_init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c index acb0ac194672..641c56fd08a2 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1020,7 +1020,7 @@ static inline unsigned long compound_nr_pages(struct vmem_altmap *altmap, if (!vmemmap_can_optimize(altmap, pgmap)) return pgmap_vmemmap_nr(pgmap); - return 2 * (PAGE_SIZE / sizeof(struct page)); + return VMEMMAP_RESERVE_NR * (PAGE_SIZE / sizeof(struct page)); } static void __ref memmap_init_compound(struct page *head, |