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Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 06a6076c92e5..bb50cacc3ea5 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1133,7 +1133,7 @@ static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *
* by another page fault trying to merge _that_. But that's ok: if it
* is being set up, that automatically means that it will be a singleton
* acceptable for merging, so we can do all of this optimistically. But
- * we do that ACCESS_ONCE() to make sure that we never re-load the pointer.
+ * we do that READ_ONCE() to make sure that we never re-load the pointer.
*
* IOW: that the "list_is_singular()" test on the anon_vma_chain only
* matters for the 'stable anon_vma' case (ie the thing we want to avoid
@@ -1147,7 +1147,7 @@ static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *
static struct anon_vma *reusable_anon_vma(struct vm_area_struct *old, struct vm_area_struct *a, struct vm_area_struct *b)
{
if (anon_vma_compatible(a, b)) {
- struct anon_vma *anon_vma = ACCESS_ONCE(old->anon_vma);
+ struct anon_vma *anon_vma = READ_ONCE(old->anon_vma);
if (anon_vma && list_is_singular(&old->anon_vma_chain))
return anon_vma;
@@ -1551,11 +1551,10 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
/* Clear old maps */
error = -ENOMEM;
-munmap_back:
- if (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) {
+ while (find_vma_links(mm, addr, addr + len, &prev, &rb_link,
+ &rb_parent)) {
if (do_munmap(mm, addr, len))
return -ENOMEM;
- goto munmap_back;
}
/*
@@ -1571,7 +1570,8 @@ munmap_back:
/*
* Can we just expand an old mapping?
*/
- vma = vma_merge(mm, prev, addr, addr + len, vm_flags, NULL, file, pgoff, NULL);
+ vma = vma_merge(mm, prev, addr, addr + len, vm_flags, NULL, file, pgoff,
+ NULL);
if (vma)
goto out;
@@ -2100,7 +2100,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
actual_size = size;
if (size && (vma->vm_flags & (VM_GROWSUP | VM_GROWSDOWN)))
actual_size -= PAGE_SIZE;
- if (actual_size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
+ if (actual_size > READ_ONCE(rlim[RLIMIT_STACK].rlim_cur))
return -ENOMEM;
/* mlock limit tests */
@@ -2108,7 +2108,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
unsigned long locked;
unsigned long limit;
locked = mm->locked_vm + grow;
- limit = ACCESS_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur);
+ limit = READ_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur);
limit >>= PAGE_SHIFT;
if (locked > limit && !capable(CAP_IPC_LOCK))
return -ENOMEM;
@@ -2739,11 +2739,10 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
/*
* Clear old maps. this also does some error checking for us
*/
- munmap_back:
- if (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) {
+ while (find_vma_links(mm, addr, addr + len, &prev, &rb_link,
+ &rb_parent)) {
if (do_munmap(mm, addr, len))
return -ENOMEM;
- goto munmap_back;
}
/* Check against address space limits *after* clearing old maps... */