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Patch series "mm/swapfile: fix and cleanup swap list iterations", v2. This series fixes a potential list iteration issue in swap_sync_discard() when devices are removed, and includes a cleanup for __folio_throttle_swaprate(). This patch (of 2): When the next node is removed from the plist (e.g. by swapoff), plist_del() makes the node point to itself, causing the iteration to loop on the same entry indefinitely. Add a plist_node_empty() check to detect this case and restart iteration, allowing swap_sync_discard() to continue processing remaining swap devices that still have pending discard entries. Additionally, switch from swap_avail_lock/swap_avail_head to swap_lock/swap_active_head so that iteration is only affected by swapoff operations rather than frequent availability changes, reducing exceptional condition checks and lock contention. Link: https://lkml.kernel.org/r/20251127100303.783198-1-youngjun.park@lge.com Link: https://lkml.kernel.org/r/20251127100303.783198-2-youngjun.park@lge.com Fixes: 686ea517f471 ("mm, swap: do not perform synchronous discard during allocation") Signed-off-by: Youngjun Park <youngjun.park@lge.com> Suggested-by: Kairui Song <kasong@tencent.com> Acked-by: Kairui Song <kasong@tencent.com> Reviewed-by: Baoquan He <bhe@redhat.com> Cc: Barry Song <baohua@kernel.org> Cc: Chris Li <chrisl@kernel.org> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: Nhat Pham <nphamcs@gmail.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 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.