[PATCH] madvise: Avoid returning error code -EBADF for anonymous mappings

Revert this recent correctness change: Douglas Crosher <dcrosher@scieneer.com>
reported that it broke an existing application, and that madvise() works
without error on anonymous mappings on Solaris.

This means that madvise() will remain non-standards-compliant: we should
return -EBADF for all requests against non-file-backed vma's, but Linux only
does this for MADV_WILLNEED requests.

Signed-off-by: Suzuki K P <suzuki@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/mm/madvise.c b/mm/madvise.c
index 4454936f87d1..20e075d1c64c 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -83,6 +83,9 @@ static long madvise_willneed(struct vm_area_struct * vma,
 {
         struct file *file = vma->vm_file;
 
+        if (!file)
+                return -EBADF;
+
         if (file->f_mapping->a_ops->get_xip_page) {
                 /* no bad return value, but ignore advice */
                 return 0;
@@ -141,11 +144,7 @@ static long
 madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
                 unsigned long start, unsigned long end, int behavior)
 {
-        struct file *filp = vma->vm_file;
-        long error = -EBADF;
-
-        if (!filp)
-                goto  out;
+        long error;
 
         switch (behavior) {
         case MADV_NORMAL:
@@ -166,8 +165,6 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
                 error = -EINVAL;
                 break;
         }
-                
-out:
         return error;
 }