X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Fmemory.c;h=b3d73bb1f6803037384db42a44965b4c60f79c8a;hb=3e733f071e16bdad13a75eedb102e8941b09927e;hp=1d647ab0ee72d02f8ad735273d46b862b3fbcee9;hpb=18062a91d2ddc40e19fc674afeb7cad58cfa23ab;p=powerpc.git

diff --git a/mm/memory.c b/mm/memory.c
index 1d647ab0ee..b3d73bb1f6 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;
 
@@ -481,7 +479,7 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	page = vm_normal_page(vma, addr, pte);
 	if (page) {
 		get_page(page);
-		page_dup_rmap(page);
+		page_dup_rmap(page, vma, addr);
 		rss[!!PageAnon(page)]++;
 	}
 
@@ -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)