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Shakeel Butt
a3417097fb
The v1 soft limit has been deprecated since v6.12 and nobody has reported depending on it. Start the removal by decoupling the interface from the implementation: keep memory.soft_limit_in_bytes, but ignore writes to it and always report the maximum value on read similar to what memory.kmem.limit_in_bytes already does. Writes are still parsed, so malformed input keeps returning -EINVAL. The knob now also behaves the same everywhere: it used to return -EOPNOTSUPP on PREEMPT_RT, where soft limit reclaim has always been disabled. This also fixes the syzbot report linked below. Soft limit reclaim is the only caller that runs shrink_lruvec() from kswapd against a specific memcg, so it is the only way to reach lru_gen_shrink_lruvec() and in turn set_mm_walk(), which warns when called from kswapd. Link: https://lore.kernel.org/[email protected] Signed-off-by: Shakeel Butt <[email protected]> Reported-by: [email protected] Closes: https://lore.kernel.org/all/[email protected]/ Acked-by: Michal Hocko <[email protected]> Cc: Axel Rasmussen <[email protected]> Cc: Barry Song <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Kairui Song <[email protected]> Cc: Lorenzo Stoakes <[email protected]> Cc: Muchun Song <[email protected]> Cc: Roman Gushchin <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]>