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    Subject[PATCH v2 tip/core/rcu 36/39] srcutorture: Print Tiny SRCU reader statistics
    Date
    The srcu_torture_stats() function is adapted to the specific srcu_struct
    layout traditionally used by SRCU. This commit therefore adds support
    for Tiny SRCU.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    kernel/rcu/rcutorture.c | 15 +++++++++++----
    1 file changed, 11 insertions(+), 4 deletions(-)

    diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
    index 98591e16db1a..9cbb8a7b909d 100644
    --- a/kernel/rcu/rcutorture.c
    +++ b/kernel/rcu/rcutorture.c
    @@ -559,11 +559,12 @@ static void srcu_torture_barrier(void)

    static void srcu_torture_stats(void)
    {
    -#ifdef CONFIG_TREE_SRCU
    - int cpu;
    - int idx = srcu_ctlp->completed & 0x1;
    + int __maybe_unused cpu;
    + int idx;

    - pr_alert("%s%s per-CPU(idx=%d):",
    +#ifdef CONFIG_TREE_SRCU
    + idx = srcu_ctlp->completed & 0x1;
    + pr_alert("%s%s Tree SRCU per-CPU(idx=%d):",
    torture_type, TORTURE_FLAG, idx);
    for_each_possible_cpu(cpu) {
    unsigned long l0, l1;
    @@ -588,6 +589,12 @@ static void srcu_torture_stats(void)
    pr_cont(" %d(%ld,%ld)", cpu, c0, c1);
    }
    pr_cont("\n");
    +#elif defined(CONFIG_TINY_SRCU)
    + idx = READ_ONCE(srcu_ctlp->srcu_idx) & 0x1;
    + pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%d,%d)\n",
    + torture_type, TORTURE_FLAG, idx,
    + READ_ONCE(srcu_ctlp->srcu_lock_nesting[!idx]),
    + READ_ONCE(srcu_ctlp->srcu_lock_nesting[idx]));
    #endif
    }

    --
    2.5.2
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