On Tue, May 05, 2020 at 07:55:41PM +0800, Zhen Lei wrote:
> +++ b/mm/swapfile.c
> @@ -177,8 +177,8 @@ static int discard_swap(struct swap_info_struct *si)
>
> /* Do not discard the swap header page! */
> se = first_se(si);
> - start_block = (se->start_block + 1) << (PAGE_SHIFT - 9);
> - nr_blocks = ((sector_t)se->nr_pages - 1) << (PAGE_SHIFT - 9);
> + start_block = (se->start_block + 1) << SECTORS_PER_PAGE_SHIFT;
> + nr_blocks = ((sector_t)se->nr_pages - 1) << SECTORS_PER_PAGE_SHIFT;
Thinking about this some more, wouldn't this look better?
start_block = page_sectors(se->start_block + 1);
nr_block = page_sectors(se->nr_pages - 1);
--
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