X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=mm%2Fmmap.c;h=de2c1769cc68d6de4744307ee45201a2f2c35cc4;hb=a0110642e6efc49cc214a67b9749a791b0ca045d;hp=d3d9a94ca03119919bc36629c6656b43cf6db44d;hpb=4cae85bed43d890f840019e2d21e39f96430802a;p=cascardo%2Flinux.git

diff --git a/mm/mmap.c b/mm/mmap.c
index d3d9a94ca031..de2c1769cc68 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -168,7 +168,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
 	return next;
 }
 
-static unsigned long do_brk(unsigned long addr, unsigned long len);
+static int do_brk(unsigned long addr, unsigned long len);
 
 SYSCALL_DEFINE1(brk, unsigned long, brk)
 {
@@ -224,7 +224,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 		goto out;
 
 	/* Ok, looks good - let it rip. */
-	if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
+	if (do_brk(oldbrk, newbrk-oldbrk) < 0)
 		goto out;
 
 set_brk:
@@ -2625,7 +2625,7 @@ static inline void verify_mm_writelocked(struct mm_struct *mm)
  *  anonymous maps.  eventually we may be able to do some
  *  brk-specific accounting here.
  */
-static unsigned long do_brk(unsigned long addr, unsigned long len)
+static int do_brk(unsigned long addr, unsigned long len)
 {
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma, *prev;
@@ -2636,7 +2636,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
 
 	len = PAGE_ALIGN(len);
 	if (!len)
-		return addr;
+		return 0;
 
 	flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
 
@@ -2703,13 +2703,13 @@ out:
 	if (flags & VM_LOCKED)
 		mm->locked_vm += (len >> PAGE_SHIFT);
 	vma->vm_flags |= VM_SOFTDIRTY;
-	return addr;
+	return 0;
 }
 
-unsigned long vm_brk(unsigned long addr, unsigned long len)
+int vm_brk(unsigned long addr, unsigned long len)
 {
 	struct mm_struct *mm = current->mm;
-	unsigned long ret;
+	int ret;
 	bool populate;
 
 	if (down_write_killable(&mm->mmap_sem))
@@ -2718,7 +2718,7 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
 	ret = do_brk(addr, len);
 	populate = ((mm->def_flags & VM_LOCKED) != 0);
 	up_write(&mm->mmap_sem);
-	if (populate)
+	if (populate && !ret)
 		mm_populate(addr, len);
 	return ret;
 }