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SubjectRe: [PATCH 2/4] mm/swap: use SECTORS_PER_PAGE_SHIFT to clean up code
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On 2020/5/6 1:25, Matthew Wilcox wrote:
> 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);
>

OK,That's fine, it's clearer. And in this way, there won't be more than 80 columns.

>
> .
>

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