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    SubjectRe: [PATCH] staging: android/lowmemorykiller: Don't grab tasklist_lock
    On 02/01, Anton Vorontsov wrote:
    > @@ -132,7 +133,7 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
    > }
    > selected_oom_adj = min_adj;
    > - read_lock(&tasklist_lock);
    > + rcu_read_lock();

    This has the same problem, force_sig() becomes unsafe.

    Why do you need force_? Do you really want to kill /sbin/init (or sub-namespace
    init) ?

    We could change force_sig_info() to use lock_task_sighand(), but I'd like to
    avoid this. Imho, this interface should be cleanuped, and it should be used
    for synchronous signals only.

    With or without this patch, sig == NULL is not possible but !mm is not right,
    there could be other other threads with mm != NULL.


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