[PATCH] mincore: fill in results properly

Paper bag time. Thanks to Randy for noticing that I didn't actually assign
'present' to anything.

Unfortunately my original patch passed the few simple test cases I gave it,
purely by coincidence.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/mm/mincore.c b/mm/mincore.c
index 9780097e3812..9c1d0a426e95 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -125,6 +125,8 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
 #endif
                         }
                 }
+
+                vec[i] = present;
         }
         pte_unmap_unlock(ptep-1, ptl);
 
@@ -135,6 +137,9 @@ none_mapped:
                 pgoff = linear_page_index(vma, addr);
                 for (i = 0; i < nr; i++, pgoff++)
                         vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
+        } else {
+                for (i = 0; i < nr; i++)
+                        vec[i] = 0;
         }
 
         return nr;