diff options
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 0ce968b00b7c..1f614d778a8b 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -336,7 +336,7 @@ int alloc_bootmem_huge_page(struct hstate *hstate) unsigned long gpage_npages[MMU_PAGE_COUNT]; static int __init do_gpage_early_setup(char *param, char *val, - const char *unused) + const char *unused, void *arg) { static phys_addr_t size; unsigned long npages; @@ -385,7 +385,7 @@ void __init reserve_hugetlb_gpages(void) strlcpy(cmdline, boot_command_line, COMMAND_LINE_SIZE); parse_args("hugetlb gpages", cmdline, NULL, 0, 0, 0, - &do_gpage_early_setup); + NULL, &do_gpage_early_setup); /* * Walk gpage list in reverse, allocating larger page sizes first. @@ -439,11 +439,6 @@ int alloc_bootmem_huge_page(struct hstate *hstate) } #endif -int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) -{ - return 0; -} - #ifdef CONFIG_PPC_FSL_BOOK3E #define HUGEPD_FREELIST_SIZE \ ((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t)) @@ -689,27 +684,34 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, struct page * follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) { - pte_t *ptep; - struct page *page; + pte_t *ptep, pte; unsigned shift; unsigned long mask, flags; + struct page *page = ERR_PTR(-EINVAL); + + local_irq_save(flags); + ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); + if (!ptep) + goto no_page; + pte = READ_ONCE(*ptep); /* + * Verify it is a huge page else bail. * Transparent hugepages are handled by generic code. We can skip them * here. */ - local_irq_save(flags); - ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); + if (!shift || pmd_trans_huge(__pmd(pte_val(pte)))) + goto no_page; - /* Verify it is a huge page else bail. */ - if (!ptep || !shift || pmd_trans_huge(*(pmd_t *)ptep)) { - local_irq_restore(flags); - return ERR_PTR(-EINVAL); + if (!pte_present(pte)) { + page = NULL; + goto no_page; } mask = (1UL << shift) - 1; - page = pte_page(*ptep); + page = pte_page(pte); if (page) page += (address & mask) / PAGE_SIZE; +no_page: local_irq_restore(flags); return page; } |