[PATCH] mm: allow unmapped hole at head side of mbind range

[Li Xinhai <xinhai.li@xxxxxxxxxxx>]

From: Li Xinhai  <xinhai.li@xxxxxxxxxxx>

mbind_range silently ignore unmapped hole at middle and tail of the 
specified range, but report EFAULT if hole at head side.
It is more reasonable to support silently ignore holes at any part of 
the range, only report EFAULT if the whole range is in hole.

Signed-off-by: Li Xinhai <xinhai.li@xxxxxxxxxxx>
---

 mm/mempolicy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4ae967bcf954..ae160d9936d9 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -738,7 +738,7 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
        unsigned long vmend;
 
        vma = find_vma(mm, start);
-       if (!vma || vma->vm_start > start)
+       if (!vma || vma->vm_start >= end)
                return -EFAULT;
 
        prev = vma->vm_prev;