diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pgtable.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index d2767a4c027b..17d961c612fc 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1103,6 +1103,43 @@ static inline int clear_flush_young_ptes(struct vm_area_struct *vma, } #endif +#ifndef test_and_clear_young_ptes +/** + * test_and_clear_young_ptes - Mark PTEs that map consecutive pages of the same + * folio as old + * @vma: The virtual memory area the pages are mapped into. + * @addr: Address the first page is mapped at. + * @ptep: Page table pointer for the first entry. + * @nr: Number of entries to clear access bit. + * + * May be overridden by the architecture; otherwise, implemented as a simple + * loop over ptep_test_and_clear_young(). + * + * Note that PTE bits in the PTE range besides the PFN can differ. For example, + * some PTEs might be write-protected. + * + * Context: The caller holds the page table lock. The PTEs map consecutive + * pages that belong to the same folio. The PTEs are all in the same PMD. + * + * Returns: whether any PTE was young. + */ +static inline int test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr) +{ + int young = 0; + + for (;;) { + young |= ptep_test_and_clear_young(vma, addr, ptep); + if (--nr == 0) + break; + ptep++; + addr += PAGE_SIZE; + } + + return young; +} +#endif + /* * On some architectures hardware does not set page access bit when accessing * memory page, it is responsibility of software setting this bit. It brings |