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Commit [1] introduced IO polling support duding swapin to reduce swap read
latency for block devices that can be polled. However later commit [2]
removed polling support. Commit [3] removed the remnants of polling
support from read_swap_cache_async() and __read_swap_cache_async().
However, it left behind some remnants in swap_read_folio(), the
'synchronous' argument.
swap_read_folio() reads the folio synchronously if synchronous=true or if
SWP_SYNCHRONOUS_IO is set in swap_info_struct. The only caller that
passes synchronous=true is in do_swap_page() in the SWP_SYNCHRONOUS_IO
case.
Hence, the argument is redundant, it is only set to true when the swap
read would have been synchronous anyway. Remove it.
[1] Commit 23955622ff8d ("swap: add block io poll in swapin path")
[2] Commit 9650b453a3d4 ("block: ignore RWF_HIPRI hint for sync dio")
[3] Commit b243dcbf2f13 ("swap: remove remnants of polling from read_swap_cache_async")
Link: https://lkml.kernel.org/r/20240607045515.1836558-1-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
b2d1f38b52