diff options
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/mm/memory.c b/mm/memory.c index cb94488ab96..b3d73bb1f68 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -78,11 +78,9 @@ unsigned long num_physpages; * and ZONE_HIGHMEM. */ void * high_memory; -unsigned long vmalloc_earlyreserve; EXPORT_SYMBOL(num_physpages); EXPORT_SYMBOL(high_memory); -EXPORT_SYMBOL(vmalloc_earlyreserve); int randomize_va_space __read_mostly = 1; @@ -1055,6 +1053,14 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, do { struct page *page; + /* + * If tsk is ooming, cut off its access to large memory + * allocations. It has a pending SIGKILL, but it can't + * be processed until returning to user space. + */ + if (unlikely(test_tsk_thread_flag(tsk, TIF_MEMDIE))) + return -ENOMEM; + if (write) foll_flags |= FOLL_WRITE; @@ -1691,9 +1697,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, flush_cache_page(vma, address, pte_pfn(orig_pte)); entry = pte_mkyoung(orig_pte); entry = maybe_mkwrite(pte_mkdirty(entry), vma); - ptep_set_access_flags(vma, address, page_table, entry, 1); - update_mmu_cache(vma, address, entry); - lazy_mmu_prot_update(entry); + if (ptep_set_access_flags(vma, address, page_table, entry,1)) { + update_mmu_cache(vma, address, entry); + lazy_mmu_prot_update(entry); + } ret |= VM_FAULT_WRITE; goto unlock; } @@ -2525,10 +2532,9 @@ static inline int handle_pte_fault(struct mm_struct *mm, pte_t *pte, pmd_t *pmd, int write_access) { pte_t entry; - pte_t old_entry; spinlock_t *ptl; - old_entry = entry = *pte; + entry = *pte; if (!pte_present(entry)) { if (pte_none(entry)) { if (vma->vm_ops) { @@ -2561,8 +2567,7 @@ static inline int handle_pte_fault(struct mm_struct *mm, entry = pte_mkdirty(entry); } entry = pte_mkyoung(entry); - if (!pte_same(old_entry, entry)) { - ptep_set_access_flags(vma, address, pte, entry, write_access); + if (ptep_set_access_flags(vma, address, pte, entry, write_access)) { update_mmu_cache(vma, address, entry); lazy_mmu_prot_update(entry); } else { @@ -2674,7 +2679,7 @@ int make_pages_present(unsigned long addr, unsigned long end) write = (vma->vm_flags & VM_WRITE) != 0; BUG_ON(addr >= end); BUG_ON(end > vma->vm_end); - len = (end+PAGE_SIZE-1)/PAGE_SIZE-addr/PAGE_SIZE; + len = DIV_ROUND_UP(end, PAGE_SIZE) - addr/PAGE_SIZE; ret = get_user_pages(current, current->mm, addr, len, write, 0, NULL, NULL); if (ret < 0) |