[PATCH v3 0/7] Prepare mutable list iterators to cache cursor state

[Kaitao Cheng <kaitao.cheng@linux.dev>]

From: chengkaitao <chengkaitao@kylinos.cn>

The list_for_each*_safe() helpers are used when the loop body may remove
the current entry.  Their current interface, however, forces every caller
to define a temporary cursor outside the macro and pass it in, even when
the caller never uses that cursor directly.  For most call sites this
extra cursor is just boilerplate required by the macro implementation.

This is awkward because the saved next pointer is an internal detail of
the iteration.  Callers that only remove or move the current entry do not
need to spell it out.

The _safe() suffix has also caused confusion.  Christian Koenig pointed
out that the name is easy to read as a thread-safe variant, especially
for beginners, even though it only means that the iterator keeps enough
state to tolerate removal of the current entry.  He suggested _mutable()
as a clearer description of what the loop permits.

Add *_mutable() iterator variants for list, hlist and llist.  The new
helpers are variadic and support both forms.  In the common case, the
caller omits the temporary cursor and the macro creates a unique internal
cursor with typeof(pos) and __UNIQUE_ID().  If a loop really needs an
explicit temporary cursor, the caller can still pass it and the helper
keeps the existing *_safe() behaviour.

For example, a call site may use the shorter form:

  list_for_each_entry_mutable(pos, head, member)

or keep the explicit temporary cursor form:

  list_for_each_entry_mutable(pos, tmp, head, member)

The existing *_safe() helpers remain available for compatibility.  This
series only converts users in mm, block, kernel, init and io_uring.  If
this approach looks acceptable, the remaining users can be converted in
follow-up series.

Changes in v3 (Christian König, Andy Shevchenko):
- Convert safe list walks to mutable iterators

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 v2:
https://lore.kernel.org/all/20260609061347.93688-1-kaitao.cheng@linux.dev/

Link to v1:
https://lore.kernel.org/all/20260529082149.76764-1-kaitao.cheng@linux.dev/

Kaitao Cheng (7):
  list: Add mutable iterator variants
  llist: Add mutable iterator variants
  mm: Use mutable list iterators
  block: Use mutable list iterators
  kernel: Use mutable list iterators
  initramfs: Use mutable list iterator
  io_uring: Use mutable list iterators

 block/bfq-iosched.c                 |  17 +-
 block/blk-cgroup.c                  |  12 +-
 block/blk-flush.c                   |   4 +-
 block/blk-iocost.c                  |  18 +-
 block/blk-mq.c                      |   8 +-
 block/blk-throttle.c                |   4 +-
 block/kyber-iosched.c               |   4 +-
 block/partitions/ldm.c              |   8 +-
 block/sed-opal.c                    |   4 +-
 include/linux/list.h                | 269 ++++++++++++++++++++++++----
 include/linux/llist.h               |  81 +++++++--
 init/initramfs.c                    |   5 +-
 io_uring/cancel.c                   |   6 +-
 io_uring/poll.c                     |   3 +-
 io_uring/rw.c                       |   4 +-
 io_uring/timeout.c                  |   8 +-
 io_uring/uring_cmd.c                |   3 +-
 kernel/audit_tree.c                 |   4 +-
 kernel/audit_watch.c                |  16 +-
 kernel/auditfilter.c                |   4 +-
 kernel/auditsc.c                    |   4 +-
 kernel/bpf/arena.c                  |  10 +-
 kernel/bpf/arraymap.c               |   8 +-
 kernel/bpf/bpf_local_storage.c      |   3 +-
 kernel/bpf/bpf_lru_list.c           |  25 ++-
 kernel/bpf/btf.c                    |  18 +-
 kernel/bpf/cgroup.c                 |   7 +-
 kernel/bpf/cpumap.c                 |   4 +-
 kernel/bpf/devmap.c                 |  10 +-
 kernel/bpf/helpers.c                |   8 +-
 kernel/bpf/local_storage.c          |   4 +-
 kernel/bpf/memalloc.c               |  16 +-
 kernel/bpf/offload.c                |   8 +-
 kernel/bpf/states.c                 |   4 +-
 kernel/bpf/stream.c                 |   4 +-
 kernel/bpf/verifier.c               |   6 +-
 kernel/cgroup/cgroup-v1.c           |   4 +-
 kernel/cgroup/cgroup.c              |  54 +++---
 kernel/cgroup/dmem.c                |  12 +-
 kernel/cgroup/rdma.c                |   8 +-
 kernel/events/core.c                |  44 +++--
 kernel/events/uprobes.c             |  12 +-
 kernel/exit.c                       |   8 +-
 kernel/fail_function.c              |   4 +-
 kernel/gcov/clang.c                 |   4 +-
 kernel/irq_work.c                   |   4 +-
 kernel/kexec_core.c                 |   4 +-
 kernel/kprobes.c                    |  16 +-
 kernel/livepatch/core.c             |   4 +-
 kernel/livepatch/core.h             |   4 +-
 kernel/liveupdate/kho_block.c       |   4 +-
 kernel/liveupdate/luo_flb.c         |   4 +-
 kernel/locking/rwsem.c              |   2 +-
 kernel/locking/test-ww_mutex.c      |   2 +-
 kernel/module/main.c                |  11 +-
 kernel/padata.c                     |   4 +-
 kernel/power/snapshot.c             |   8 +-
 kernel/power/wakelock.c             |   4 +-
 kernel/printk/printk.c              |  11 +-
 kernel/ptrace.c                     |   4 +-
 kernel/rcu/rcutorture.c             |   3 +-
 kernel/rcu/tasks.h                  |   9 +-
 kernel/rcu/tree.c                   |   6 +-
 kernel/resource.c                   |   4 +-
 kernel/sched/core.c                 |   4 +-
 kernel/sched/ext.c                  |  22 +--
 kernel/sched/fair.c                 |  28 +--
 kernel/sched/topology.c             |   4 +-
 kernel/sched/wait.c                 |   4 +-
 kernel/seccomp.c                    |   4 +-
 kernel/signal.c                     |  11 +-
 kernel/smp.c                        |   4 +-
 kernel/taskstats.c                  |   8 +-
 kernel/time/clockevents.c           |   6 +-
 kernel/time/clocksource.c           |   4 +-
 kernel/time/posix-cpu-timers.c      |   4 +-
 kernel/time/posix-timers.c          |   3 +-
 kernel/torture.c                    |   3 +-
 kernel/trace/bpf_trace.c            |   4 +-
 kernel/trace/ftrace.c               |  49 +++--
 kernel/trace/ring_buffer.c          |  25 ++-
 kernel/trace/trace.c                |  12 +-
 kernel/trace/trace_dynevent.c       |   6 +-
 kernel/trace/trace_dynevent.h       |   5 +-
 kernel/trace/trace_events.c         |  35 ++--
 kernel/trace/trace_events_filter.c  |   4 +-
 kernel/trace/trace_events_hist.c    |   8 +-
 kernel/trace/trace_events_trigger.c |  17 +-
 kernel/trace/trace_events_user.c    |  16 +-
 kernel/trace/trace_stat.c           |   4 +-
 kernel/user-return-notifier.c       |   3 +-
 kernel/workqueue.c                  |  16 +-
 mm/backing-dev.c                    |   8 +-
 mm/balloon.c                        |   8 +-
 mm/cma.c                            |   4 +-
 mm/compaction.c                     |   4 +-
 mm/damon/core.c                     |   4 +-
 mm/damon/sysfs-schemes.c            |   4 +-
 mm/dmapool.c                        |   4 +-
 mm/huge_memory.c                    |   8 +-
 mm/hugetlb.c                        |  56 +++---
 mm/hugetlb_vmemmap.c                |  16 +-
 mm/khugepaged.c                     |  14 +-
 mm/kmemleak.c                       |   7 +-
 mm/ksm.c                            |  25 +--
 mm/list_lru.c                       |   4 +-
 mm/memcontrol-v1.c                  |   8 +-
 mm/memory-failure.c                 |  12 +-
 mm/memory-tiers.c                   |   4 +-
 mm/migrate.c                        |  23 ++-
 mm/mmu_notifier.c                   |   9 +-
 mm/page_alloc.c                     |   8 +-
 mm/page_reporting.c                 |   2 +-
 mm/percpu.c                         |  11 +-
 mm/pgtable-generic.c                |   4 +-
 mm/rmap.c                           |  10 +-
 mm/shmem.c                          |   9 +-
 mm/slab_common.c                    |  14 +-
 mm/slub.c                           |  33 ++--
 mm/swapfile.c                       |   4 +-
 mm/userfaultfd.c                    |  12 +-
 mm/vmalloc.c                        |  24 +--
 mm/vmscan.c                         |   7 +-
 mm/zsmalloc.c                       |   4 +-
 124 files changed, 875 insertions(+), 681 deletions(-)

-- 
2.43.0