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    Subject[PATCH v3 tip/core/rcu 31/40] srcu: Allow a second bit in rcu_seq for SRCU state
    Date
    This commit increases the number of reserved bits at the bottom of an
    rcu_seq grace-period counter from one to two, as will be needed to
    accommodate SRCU's three-state grace periods.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    kernel/rcu/rcu.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
    index c62df93bfc1b..87a0ac95b551 100644
    --- a/kernel/rcu/rcu.h
    +++ b/kernel/rcu/rcu.h
    @@ -61,7 +61,7 @@
    * Grace-period counter management.
    */

    -#define RCU_SEQ_CTR_SHIFT 1
    +#define RCU_SEQ_CTR_SHIFT 2
    #define RCU_SEQ_STATE_MASK ((1 << RCU_SEQ_CTR_SHIFT) - 1)

    /*
    --
    2.5.2
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