diff options
Diffstat (limited to 'arch/s390/mm/pageattr.c')
| -rw-r--r-- | arch/s390/mm/pageattr.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index 8400f494623f..3fef3b299665 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -6,6 +6,7 @@ #include <linux/module.h> #include <linux/mm.h> #include <asm/cacheflush.h> +#include <asm/facility.h> #include <asm/pgtable.h> #include <asm/page.h> @@ -103,27 +104,50 @@ int set_memory_x(unsigned long addr, int numpages) } #ifdef CONFIG_DEBUG_PAGEALLOC + +static void ipte_range(pte_t *pte, unsigned long address, int nr) +{ + int i; + + if (test_facility(13) && IS_ENABLED(CONFIG_64BIT)) { + __ptep_ipte_range(address, nr - 1, pte); + return; + } + for (i = 0; i < nr; i++) { + __ptep_ipte(address, pte); + address += PAGE_SIZE; + pte++; + } +} + void kernel_map_pages(struct page *page, int numpages, int enable) { unsigned long address; + int nr, i, j; pgd_t *pgd; pud_t *pud; pmd_t *pmd; pte_t *pte; - int i; - for (i = 0; i < numpages; i++) { + for (i = 0; i < numpages;) { address = page_to_phys(page + i); pgd = pgd_offset_k(address); pud = pud_offset(pgd, address); pmd = pmd_offset(pud, address); pte = pte_offset_kernel(pmd, address); - if (!enable) { - __ptep_ipte(address, pte); - pte_val(*pte) = _PAGE_INVALID; - continue; + nr = (unsigned long)pte >> ilog2(sizeof(long)); + nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1)); + nr = min(numpages - i, nr); + if (enable) { + for (j = 0; j < nr; j++) { + pte_val(*pte) = __pa(address); + address += PAGE_SIZE; + pte++; + } + } else { + ipte_range(pte, address, nr); } - pte_val(*pte) = __pa(address); + i += nr; } } |