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authorHugh Dickins <hugh@veritas.com>2007-01-29 21:24:08 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 08:33:32 -0800
commit701dfbc1cbdd42b814dd76a885c4b73f97011d08 (patch)
tree4a8e8185616e7cc9c115de564bd2c6d626662217 /mm/mremap.c
parent8339f0008c47cdd921c73f6d53d5588b5484f93c (diff)
downloadop-kernel-dev-701dfbc1cbdd42b814dd76a885c4b73f97011d08.zip
op-kernel-dev-701dfbc1cbdd42b814dd76a885c4b73f97011d08.tar.gz
[PATCH] mm: mremap correct rmap accounting
Nick Piggin points out that page accounting on MIPS multiple ZERO_PAGEs is not maintained by its move_pte, and could lead to freeing a ZERO_PAGE. Instead of complicating that move_pte, just forget the minor optimization when mremapping, and change the one thing which needed it for correctness - filemap_xip use ZERO_PAGE(0) throughout instead of according to address. [ "There is no block device driver one could use for XIP on mips platforms" - Carsten Otte ] Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Andrew Morton <akpm@osdl.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 9c769fa..5d4bd4f 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -105,7 +105,6 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
if (pte_none(*old_pte))
continue;
pte = ptep_clear_flush(vma, old_addr, old_pte);
- /* ZERO_PAGE can be dependant on virtual addr */
pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr);
set_pte_at(mm, new_addr, new_pte, pte);
}
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