From: akpm@osdl.org
To: torvalds@osdl.org
Cc: linux-mm@kvack.org, akpm@osdl.org
Subject: [patch 34/57] unmap_mapping_range: add comment
Date: Sat, 22 May 2004 15:09:17 -0700 [thread overview]
Message-ID: <200405222209.i4MM9or13730@mail.osdl.org> (raw)
---
25-akpm/mm/memory.c | 6 ++++++
1 files changed, 6 insertions(+)
diff -puN mm/memory.c~unmap_mapping_range-comment mm/memory.c
--- 25/mm/memory.c~unmap_mapping_range-comment 2004-05-22 14:56:27.000986752 -0700
+++ 25-akpm/mm/memory.c 2004-05-22 14:59:38.319901856 -0700
@@ -1183,6 +1183,12 @@ void unmap_mapping_range(struct address_
if (unlikely(!prio_tree_empty(&mapping->i_mmap_shared)))
unmap_mapping_range_list(&mapping->i_mmap_shared, &details);
+ /*
+ * In nonlinear VMAs there is no correspondence between virtual address
+ * offset and file offset. So we must perform an exhaustive search
+ * across *all* the pages in each nonlinear VMA, not just the pages
+ * whose virtual address lies outside the file truncation point.
+ */
if (unlikely(!list_empty(&mapping->i_mmap_nonlinear))) {
struct vm_area_struct *vma;
list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
_
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reply other threads:[~2004-05-22 22:09 UTC|newest]
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