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    Subject[PATCH 4.9 025/120] jump_labels: API for flushing deferred jump label updates
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: David Matlack <dmatlack@google.com>

    commit b6416e61012429e0277bd15a229222fd17afc1c1 upstream.

    Modules that use static_key_deferred need a way to synchronize with
    any delayed work that is still pending when the module is unloaded.
    Introduce static_key_deferred_flush() which flushes any pending
    jump label updates.

    Signed-off-by: David Matlack <dmatlack@google.com>
    Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/jump_label_ratelimit.h | 5 +++++
    kernel/jump_label.c | 7 +++++++
    2 files changed, 12 insertions(+)

    --- a/include/linux/jump_label_ratelimit.h
    +++ b/include/linux/jump_label_ratelimit.h
    @@ -14,6 +14,7 @@ struct static_key_deferred {

    #ifdef HAVE_JUMP_LABEL
    extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
    +extern void static_key_deferred_flush(struct static_key_deferred *key);
    extern void
    jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);

    @@ -26,6 +27,10 @@ static inline void static_key_slow_dec_d
    STATIC_KEY_CHECK_USE();
    static_key_slow_dec(&key->key);
    }
    +static inline void static_key_deferred_flush(struct static_key_deferred *key)
    +{
    + STATIC_KEY_CHECK_USE();
    +}
    static inline void
    jump_label_rate_limit(struct static_key_deferred *key,
    unsigned long rl)
    --- a/kernel/jump_label.c
    +++ b/kernel/jump_label.c
    @@ -182,6 +182,13 @@ void static_key_slow_dec_deferred(struct
    }
    EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred);

    +void static_key_deferred_flush(struct static_key_deferred *key)
    +{
    + STATIC_KEY_CHECK_USE();
    + flush_delayed_work(&key->work);
    +}
    +EXPORT_SYMBOL_GPL(static_key_deferred_flush);
    +
    void jump_label_rate_limit(struct static_key_deferred *key,
    unsigned long rl)
    {

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