[PATCH mm] fix swapoff breakage; however...

[Hugh Dickins]

rc4-mm1's memory-controller-memory-accounting-v7.patch broke swapoff:
it extended unuse_pte_range's boolean "found" return code to allow an
error return too; but ended up returning found (1) as an error.
Replace that by success (0) before it gets to the upper level.

Signed-off-by: Hugh Dickins <hugh@xxxxxxxxxxx>
---
More fundamentally, it looks like any container brought over its limit in
unuse_pte will abort swapoff: that doesn't doesn't seem "contained" to me.
Maybe unuse_pte should just let containers go over their limits without
error?  Or swap should be counted along with RSS?  Needs reconsideration.

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

--- 2.6.23-rc4-mm1/mm/swapfile.c	2007-09-07 13:09:42.000000000 +0100
+++ linux/mm/swapfile.c	2007-09-17 15:14:47.000000000 +0100
@@ -642,7 +642,7 @@ static int unuse_mm(struct mm_struct *mm
 			break;
 	}
 	up_read(&mm->mmap_sem);
-	return ret;
+	return (ret < 0)? ret: 0;
 }
 
 /*
-
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