On Wed, Jan 25, 2023 at 02:34:36PM +0100, Christoph Hellwig wrote:
> @@ -363,8 +384,10 @@ void __swap_writepage(struct page *page, struct 
> writeback_control *wbc)
>        */
>       if (data_race(sis->flags & SWP_FS_OPS))
>               swap_writepage_fs(page, wbc);
> +     else if (sis->flags & SWP_SYNCHRONOUS_IO)
> +             swap_writepage_bdev_sync(page, wbc, sis);

For an additional cleanup, it looks okay to remove the SWP_SYNCHRONOUS_IO flag
entirely and just check bdev_synchronous(sis->bdev)) directly instead.

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