diff options
| -rw-r--r-- | arch/powerpc/mm/book3s64/radix_pgtable.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c index 3d67aee8c8ca..c630cece8ed4 100644 --- a/arch/powerpc/mm/book3s64/radix_pgtable.c +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -1122,18 +1122,25 @@ int __meminit radix__vmemmap_populate(unsigned long start, unsigned long end, in pte_t *pte; /* - * Make sure we align the start vmemmap addr so that we calculate - * the correct start_pfn in altmap boundary check to decided whether - * we should use altmap or RAM based backing memory allocation. Also - * the address need to be aligned for set_pte operation. - - * If the start addr is already PMD_SIZE aligned we will try to use - * a pmd mapping. We don't want to be too aggressive here beacause - * that will cause more allocations in RAM. So only if the namespace - * vmemmap start addr is PMD_SIZE aligned we will use PMD mapping. + * If altmap is present, Make sure we align the start vmemmap addr + * to PAGE_SIZE so that we calculate the correct start_pfn in + * altmap boundary check to decide whether we should use altmap or + * RAM based backing memory allocation. Also the address need to be + * aligned for set_pte operation. If the start addr is already + * PMD_SIZE aligned and with in the altmap boundary then we will + * try to use a pmd size altmap mapping else we go for page size + * mapping. + * + * If altmap is not present, align the vmemmap addr to PMD_SIZE and + * always allocate a PMD size page for vmemmap backing. + * */ - start = ALIGN_DOWN(start, PAGE_SIZE); + if (altmap) + start = ALIGN_DOWN(start, PAGE_SIZE); + else + start = ALIGN_DOWN(start, PMD_SIZE); + for (addr = start; addr < end; addr = next) { next = pmd_addr_end(addr, end); @@ -1159,7 +1166,7 @@ int __meminit radix__vmemmap_populate(unsigned long start, unsigned long end, in * in altmap block allocation failures, in which case * we fallback to RAM for vmemmap allocation. */ - if (!IS_ALIGNED(addr, PMD_SIZE) || (altmap && + if (altmap && (!IS_ALIGNED(addr, PMD_SIZE) || altmap_cross_boundary(altmap, addr, PMD_SIZE))) { /* * make sure we don't create altmap mappings |