X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=mm%2Fmlock.c;h=6fd2cf15e8687d32114f8e81516aed0a52997147;hb=71ebd1af094db1c72d69505a27dfecea99c2cb0b;hp=8a54cd214925872a66d4d1cc36b69ec6c6047324;hpb=5a1b11cbccda7680b6859a4648f7af16f30e79b4;p=deliverable%2Flinux.git

diff --git a/mm/mlock.c b/mm/mlock.c
index 8a54cd214925..6fd2cf15e868 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -205,62 +205,6 @@ out:
 	return nr_pages - 1;
 }
 
-/**
- * __mlock_vma_pages_range() -  mlock a range of pages in the vma.
- * @vma:   target vma
- * @start: start address
- * @end:   end address
- * @nonblocking:
- *
- * This takes care of making the pages present too.
- *
- * return 0 on success, negative error code on error.
- *
- * vma->vm_mm->mmap_sem must be held.
- *
- * If @nonblocking is NULL, it may be held for read or write and will
- * be unperturbed.
- *
- * If @nonblocking is non-NULL, it must held for read only and may be
- * released.  If it's released, *@nonblocking will be set to 0.
- */
-long __mlock_vma_pages_range(struct vm_area_struct *vma,
-		unsigned long start, unsigned long end, int *nonblocking)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	unsigned long nr_pages = (end - start) / PAGE_SIZE;
-	int gup_flags;
-
-	VM_BUG_ON(start & ~PAGE_MASK);
-	VM_BUG_ON(end   & ~PAGE_MASK);
-	VM_BUG_ON_VMA(start < vma->vm_start, vma);
-	VM_BUG_ON_VMA(end   > vma->vm_end, vma);
-	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
-
-	gup_flags = FOLL_TOUCH | FOLL_MLOCK;
-	/*
-	 * We want to touch writable mappings with a write fault in order
-	 * to break COW, except for shared mappings because these don't COW
-	 * and we would not want to dirty them for nothing.
-	 */
-	if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
-		gup_flags |= FOLL_WRITE;
-
-	/*
-	 * We want mlock to succeed for regions that have any permissions
-	 * other than PROT_NONE.
-	 */
-	if (vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC))
-		gup_flags |= FOLL_FORCE;
-
-	/*
-	 * We made sure addr is within a VMA, so the following will
-	 * not result in a stack expansion that recurses back here.
-	 */
-	return __get_user_pages(current, mm, start, nr_pages, gup_flags,
-				NULL, NULL, nonblocking);
-}
-
 /*
  * convert get_user_pages() return value to posix mlock() error
  */
@@ -596,7 +540,7 @@ success:
 	/*
 	 * vm_flags is protected by the mmap_sem held in write mode.
 	 * It's okay if try_to_unmap_one unmaps a page just after we
-	 * set VM_LOCKED, __mlock_vma_pages_range will bring it back.
+	 * set VM_LOCKED, populate_vma_page_range will bring it back.
 	 */
 
 	if (lock)
@@ -660,69 +604,6 @@ static int do_mlock(unsigned long start, size_t len, int on)
 	return error;
 }
 
-/*
- * __mm_populate - populate and/or mlock pages within a range of address space.
- *
- * This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap
- * flags. VMAs must be already marked with the desired vm_flags, and
- * mmap_sem must not be held.
- */
-int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
-{
-	struct mm_struct *mm = current->mm;
-	unsigned long end, nstart, nend;
-	struct vm_area_struct *vma = NULL;
-	int locked = 0;
-	long ret = 0;
-
-	VM_BUG_ON(start & ~PAGE_MASK);
-	VM_BUG_ON(len != PAGE_ALIGN(len));
-	end = start + len;
-
-	for (nstart = start; nstart < end; nstart = nend) {
-		/*
-		 * We want to fault in pages for [nstart; end) address range.
-		 * Find first corresponding VMA.
-		 */
-		if (!locked) {
-			locked = 1;
-			down_read(&mm->mmap_sem);
-			vma = find_vma(mm, nstart);
-		} else if (nstart >= vma->vm_end)
-			vma = vma->vm_next;
-		if (!vma || vma->vm_start >= end)
-			break;
-		/*
-		 * Set [nstart; nend) to intersection of desired address
-		 * range with the first VMA. Also, skip undesirable VMA types.
-		 */
-		nend = min(end, vma->vm_end);
-		if (vma->vm_flags & (VM_IO | VM_PFNMAP))
-			continue;
-		if (nstart < vma->vm_start)
-			nstart = vma->vm_start;
-		/*
-		 * Now fault in a range of pages. __mlock_vma_pages_range()
-		 * double checks the vma flags, so that it won't mlock pages
-		 * if the vma was already munlocked.
-		 */
-		ret = __mlock_vma_pages_range(vma, nstart, nend, &locked);
-		if (ret < 0) {
-			if (ignore_errors) {
-				ret = 0;
-				continue;	/* continue at next VMA */
-			}
-			ret = __mlock_posix_error_return(ret);
-			break;
-		}
-		nend = nstart + ret * PAGE_SIZE;
-		ret = 0;
-	}
-	if (locked)
-		up_read(&mm->mmap_sem);
-	return ret;	/* 0 or negative error code */
-}
-
 SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
 {
 	unsigned long locked;
@@ -750,9 +631,13 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
 		error = do_mlock(start, len, 1);
 
 	up_write(&current->mm->mmap_sem);
-	if (!error)
-		error = __mm_populate(start, len, 0);
-	return error;
+	if (error)
+		return error;
+
+	error = __mm_populate(start, len, 0);
+	if (error)
+		return __mlock_posix_error_return(error);
+	return 0;
 }
 
 SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)