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Diffstat (limited to 'mm/mincore.c')
-rw-r--r--mm/mincore.c29
1 files changed, 10 insertions, 19 deletions
diff --git a/mm/mincore.c b/mm/mincore.c
index b44d7f875cb..566b6c2bae5 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -49,29 +49,20 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
struct vm_area_struct *vma = find_vma(current->mm, addr);
/*
- * find_vma() didn't find anything: the address
- * is above everything we have mapped.
+ * find_vma() didn't find anything above us, or we're
+ * in an unmapped hole in the address space: ENOMEM.
*/
- if (!vma) {
- memset(vec, 0, pages);
- return pages;
- }
-
- /*
- * find_vma() found something, but we might be
- * below it: check for that.
- */
- if (addr < vma->vm_start) {
- unsigned long gap = (vma->vm_start - addr) >> PAGE_SHIFT;
- if (gap > pages)
- gap = pages;
- memset(vec, 0, gap);
- return gap;
- }
+ if (!vma || addr < vma->vm_start)
+ return -ENOMEM;
/*
* Ok, got it. But check whether it's a segment we support
* mincore() on. Right now, we don't do any anonymous mappings.
+ *
+ * FIXME: This is just stupid. And returning ENOMEM is
+ * stupid too. We should just look at the page tables. But
+ * this is what we've traditionally done, so we'll just
+ * continue doing it.
*/
if (!vma->vm_file)
return -ENOMEM;
@@ -142,7 +133,7 @@ asmlinkage long sys_mincore(unsigned long start, size_t len,
tmp = (void *) __get_free_page(GFP_USER);
if (!tmp)
- return -ENOMEM;
+ return -EAGAIN;
retval = 0;
while (pages) {