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All its callers either already hold a reference to, or lock the swap device while calling this function. There is only one exception in shmem_swapin_folio, just make this caller also hold a reference of the swap device, so this helper can be simplified and saves a few cycles. This also provides finer control of error handling in shmem_swapin_folio, on race (with swap off), it can just try again. For invalid swap entry, it can fail with a proper error code. Link: https://lkml.kernel.org/r/20221219185840.25441-5-ryncsn@gmail.com Signed-off-by: Kairui Song <kasong@tencent.com> Cc: David Hildenbrand <david@redhat.com> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> 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 Restructured Text 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.