mm/memory.c:do_shared_fault(): add comment

Belatedly document the changes in commit f0c6d4d295e4 ("mm: introduce
do_shared_fault() and drop do_fault()").

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Bob Liu <lliubbo@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 6efe36a..d8aebc5 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2996,6 +2996,12 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 
        if (set_page_dirty(fault_page))
                dirtied = 1;
+       /*
+        * Take a local copy of the address_space - page.mapping may be zeroed
+        * by truncate after unlock_page().   The address_space itself remains
+        * pinned by vma->vm_file's reference.  We rely on unlock_page()'s
+        * release semantics to prevent the compiler from undoing this copying.
+        */
        mapping = fault_page->mapping;
        unlock_page(fault_page);
        if ((dirtied || vma->vm_ops->page_mkwrite) && mapping) {