Messages in this thread Patch in this message | | | Date | Mon, 1 Dec 2008 00:29:41 +0000 (GMT) | From | Hugh Dickins <> | Subject | [PATCH 10/9] swapfile: change discard pgoff_t to sector_t |
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Change pgoff_t nr_blocks in discard_swap() and discard_swap_cluster() to sector_t: given the constraints on swap offsets (in particular, the 5 bits of swap type accommodated in the same unsigned long), pgoff_t was actually safe as is, but it certainly looked worrying when shifted left.
Signed-off-by: Hugh Dickins <hugh@veritas.com> --- To follow 9/9 swapfile-swap-allocation-cycle-if-nonrot.patch
mm/swapfile.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- swapfile9/mm/swapfile.c 2008-11-26 12:19:00.000000000 +0000 +++ swapfile10/mm/swapfile.c 2008-11-28 20:36:44.000000000 +0000 @@ -96,7 +96,7 @@ static int discard_swap(struct swap_info list_for_each_entry(se, &si->extent_list, list) { sector_t start_block = se->start_block << (PAGE_SHIFT - 9); - pgoff_t nr_blocks = se->nr_pages << (PAGE_SHIFT - 9); + sector_t nr_blocks = se->nr_pages << (PAGE_SHIFT - 9); if (se->start_page == 0) { /* Do not discard the swap header page! */ @@ -133,7 +133,7 @@ static void discard_swap_cluster(struct start_page < se->start_page + se->nr_pages) { pgoff_t offset = start_page - se->start_page; sector_t start_block = se->start_block + offset; - pgoff_t nr_blocks = se->nr_pages - offset; + sector_t nr_blocks = se->nr_pages - offset; if (nr_blocks > nr_pages) nr_blocks = nr_pages;
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