[PATCH 6/6] mremap rmap comment

[Hugh Dickins]

rmap's try_to_unmap_one comments on find_vma failure, that a page may
temporarily be absent from a vma during mremap: no longer, though it
is still possible for this find_vma to fail, while unmap_vmas drops
page_table_lock (but that is no problem for file truncation).

--- mremap5/mm/rmap.c	2004-03-30 13:04:19.449545248 +0100
+++ mremap6/mm/rmap.c	2004-03-30 21:25:22.961196784 +0100
@@ -315,8 +315,7 @@ static int fastcall try_to_unmap_one(str
 		return SWAP_AGAIN;
 	}
 
-
-	/* During mremap, it's possible pages are not in a VMA. */
+	/* unmap_vmas drops page_table_lock with vma unlinked */
 	vma = find_vma(mm, address);
 	if (!vma) {
 		ret = SWAP_FAIL;

-
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