Messages in this thread | | | Date | Thu, 14 May 2020 21:06:47 -0700 | From | Matthew Wilcox <> | Subject | Re: [PATCH v2 06/10] mm/swap: use npage_to_sectors() and PAGE_SECTORS to clean up code |
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On Thu, May 07, 2020 at 03:50:56PM +0800, Zhen Lei wrote: > @@ -266,7 +266,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc) > > static sector_t swap_page_sector(struct page *page) > { > - return (sector_t)__page_file_index(page) << (PAGE_SHIFT - 9); > + return npage_to_sectors((sector_t)__page_file_index(page));
If you make npage_to_sectors() a proper function instead of a macro, you can do the casting inside the function instead of in the callers (which is prone to bugs).
Also, this is a great example of why page_to_sector() was a better name than npage_to_sectors(). This function doesn't return a count of sectors, it returns a sector number within the swap device.
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