Re: [PATCH v2 4/8] mm/memory-failure: convert process iterator to for_each_process_rculock
From: Gregory Price <gourry@gourry.net>
Date: 2026-09-07 15:43:53
Also in:
linux-fsdevel, linux-mm, linux-pm, linux-security-module, lkml, rcu
On Mon, Sep 07, 2026 at 04:13:30PM +0800, Ye Liu 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. Signed-off-by: Ye Liu <liuye@kylinos.cn> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>