Re: [PATCH v4 04/15] mm/memory-failure: convert process iterator to for_each_process_rculock

From: Ye Liu <liuye@kylinos.cn>

Replace the manual rcu_read_lock()/rcu_read_unlock() pairs combined
with for_each_process() loop in mm/memory-failure.c with
for_each_process_rculock(), which scopes the RCU read lock to the
loop body via scoped_guard(rcu).

In collect_procs_file(), the page_pgoff() call now falls outside the
RCU read-side critical section.  This is safe because page_pgoff()
only reads folio->index and does not traverse any RCU-protected
structures.

Signed-off-by: Ye Liu <liuye@kylinos.cn>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260921092101.89285-1-ye.liu@linux.dev?part=4