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    Subject[PATCH RFC tip/core/rcu 29/30] rcu: add boot parameter to suppress RCU CPU stall warning messages
    Although the RCU CPU stall warning messages are a very good way to alert
    people to a problem, once alerted, it is sometimes helpful to shut them
    off in order to avoid obscuring other messages that might be being used
    to track down the problem. Although you can rebuild the kernel with
    CONFIG_RCU_CPU_STALL_DETECTOR=n, this is sometimes inconvenient. This
    commit therefore adds a boot parameter named "rcu_cpu_stall_suppress"
    that shuts these messages off without requiring a rebuild (though a
    reboot might be needed for those not brave enough to patch their kernel
    while it is running).

    This message-suppression was already in place for the panic case, so this
    commit need only rename the variable and export it via module_param().

    Signed-off-by: Paul E. McKenney <>
    kernel/rcutree.c | 11 ++++++++---
    1 files changed, 8 insertions(+), 3 deletions(-)

    diff --git a/kernel/rcutree.c b/kernel/rcutree.c
    index 5b1c3c2..f3d5906 100644
    --- a/kernel/rcutree.c
    +++ b/kernel/rcutree.c
    @@ -143,6 +143,11 @@ module_param(blimit, int, 0);
    module_param(qhimark, int, 0);
    module_param(qlowmark, int, 0);

    +int rcu_cpu_stall_suppress __read_mostly;
    +module_param(rcu_cpu_stall_suppress, int, 0);
    +#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
    static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
    static int rcu_pending(int cpu);

    @@ -450,7 +455,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)


    -int rcu_cpu_stall_panicking __read_mostly;
    +int rcu_cpu_stall_suppress __read_mostly;

    static void record_gp_stall_check_time(struct rcu_state *rsp)
    @@ -530,7 +535,7 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
    long delta;
    struct rcu_node *rnp;

    - if (rcu_cpu_stall_panicking)
    + if (rcu_cpu_stall_suppress)
    delta = jiffies - rsp->jiffies_stall;
    rnp = rdp->mynode;
    @@ -548,7 +553,7 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)

    static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr)
    - rcu_cpu_stall_panicking = 1;
    + rcu_cpu_stall_suppress = 1;
    return NOTIFY_DONE;


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