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b2d1f38b52
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] Commit23955622ff("swap: add block io poll in swapin path") [2] Commit9650b453a3("block: ignore RWF_HIPRI hint for sync dio") [3] Commitb243dcbf2f("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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.