From: Kaito Cheng <[email protected]> This series prepares for, and then updates, the list_for_each_entry() family so the common entry iterators cache their next or previous cursor before the loop body runs.
The first 13 patches open-code loops that intentionally depend on the old "derive the next entry from the current cursor at the end of the iteration" behaviour. These loops append work to the list being walked, restart traversal after dropping a lock, skip an entry consumed by the current iteration, or otherwise adjust the cursor in the loop body. The final patch changes include/linux/list.h to keep a private cursor in the common entry iterators while preserving the public macro interface. The safe variants remain available when callers need the temporary cursor explicitly or have stronger mutation requirements. Changes in v2 (Muchun Song, Andy Shevchenko): - Drop the list_for_each_entry_mutable*() helpers from v1 and make the cursor change directly in the existing list_for_each_entry*() helpers. - Open-code special list walks that rely on updating the loop cursor in the body, preserving their existing traversal semantics. Link to v1: https://lore.kernel.org/all/[email protected]/ Kaitao Cheng (14): drbd: Open-code transfer log list walk firewire: core: Open-code topology list walk drm/bridge: Open-code bridge chain list walks drm/i915/gt: Open-code active timeline walk drm/i915: Open-code DFS dependency list walk drm/ttm: Open-code reservation list walk spi: fsi: Open-code message transfer walk spi: stm32-ospi: Open-code message transfer walk spi: stm32-qspi: Open-code message transfer walk spi: tegra210-quad: Open-code message transfer walk locking/locktorture: Open-code ww mutex list walk locking/ww_mutex: Open-code stress reorder list walk ASoC: dapm: Open-code widget invalidation walk list: Cache cursors in entry iterators drivers/block/drbd/drbd_debugfs.c | 4 ++- drivers/firewire/core-topology.c | 4 ++- drivers/gpu/drm/drm_bridge.c | 7 ++-- drivers/gpu/drm/i915/gt/intel_reset.c | 4 ++- drivers/gpu/drm/i915/i915_scheduler.c | 4 ++- drivers/gpu/drm/ttm/ttm_execbuf_util.c | 4 ++- drivers/spi/spi-fsi.c | 5 ++- drivers/spi/spi-stm32-ospi.c | 4 ++- drivers/spi/spi-stm32-qspi.c | 5 ++- drivers/spi/spi-tegra210-quad.c | 4 ++- include/linux/list.h | 46 ++++++++++++++++++++------ kernel/locking/locktorture.c | 4 ++- kernel/locking/test-ww_mutex.c | 4 ++- sound/soc/soc-dapm.c | 4 ++- 14 files changed, 78 insertions(+), 25 deletions(-) -- 2.43.0
