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Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c51
1 files changed, 42 insertions, 9 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 0012071a6e50..11fc65f81ecd 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -92,14 +92,28 @@ static long madvise_behavior(struct vm_area_struct *vma,
case MADV_MERGEABLE:
case MADV_UNMERGEABLE:
error = ksm_madvise(vma, start, end, behavior, &new_flags);
- if (error)
+ if (error) {
+ /*
+ * madvise() returns EAGAIN if kernel resources, such as
+ * slab, are temporarily unavailable.
+ */
+ if (error == -ENOMEM)
+ error = -EAGAIN;
goto out;
+ }
break;
case MADV_HUGEPAGE:
case MADV_NOHUGEPAGE:
error = hugepage_madvise(vma, &new_flags, behavior);
- if (error)
+ if (error) {
+ /*
+ * madvise() returns EAGAIN if kernel resources, such as
+ * slab, are temporarily unavailable.
+ */
+ if (error == -ENOMEM)
+ error = -EAGAIN;
goto out;
+ }
break;
}
@@ -120,15 +134,37 @@ static long madvise_behavior(struct vm_area_struct *vma,
*prev = vma;
if (start != vma->vm_start) {
- error = split_vma(mm, vma, start, 1);
- if (error)
+ if (unlikely(mm->map_count >= sysctl_max_map_count)) {
+ error = -ENOMEM;
goto out;
+ }
+ error = __split_vma(mm, vma, start, 1);
+ if (error) {
+ /*
+ * madvise() returns EAGAIN if kernel resources, such as
+ * slab, are temporarily unavailable.
+ */
+ if (error == -ENOMEM)
+ error = -EAGAIN;
+ goto out;
+ }
}
if (end != vma->vm_end) {
- error = split_vma(mm, vma, end, 0);
- if (error)
+ if (unlikely(mm->map_count >= sysctl_max_map_count)) {
+ error = -ENOMEM;
+ goto out;
+ }
+ error = __split_vma(mm, vma, end, 0);
+ if (error) {
+ /*
+ * madvise() returns EAGAIN if kernel resources, such as
+ * slab, are temporarily unavailable.
+ */
+ if (error == -ENOMEM)
+ error = -EAGAIN;
goto out;
+ }
}
success:
@@ -136,10 +172,7 @@ success:
* vm_flags is protected by the mmap_sem held in write mode.
*/
vma->vm_flags = new_flags;
-
out:
- if (error == -ENOMEM)
- error = -EAGAIN;
return error;
}