Re: [PATCH v2 4/8] mm/memory-failure: convert process iterator to for_each_process_rculock

On Mon,  7 Sep 2026 16:13:30 +0800 Ye Liu [off-list ref] wrote:

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.

Thank you for clarifying :)

Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>

Reviewed-by: SJ Park <sj@kernel.org>


Thanks,
SJ

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