srcu: Fix long lines in srcu_get_delay()

This commit creates an srcu_usage pointer named "sup" as a shorter
synonym for the "ssp->srcu_sup" that was bloating several lines of code.

Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index f9dd6ed..9699bca 100644 (file)
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -616,17 +616,18 @@ static unsigned long srcu_get_delay(struct srcu_struct *ssp)
        unsigned long gpstart;
        unsigned long j;
        unsigned long jbase = SRCU_INTERVAL;
+       struct srcu_usage *sup = ssp->srcu_sup;
 
-       if (ULONG_CMP_LT(READ_ONCE(ssp->srcu_sup->srcu_gp_seq), READ_ONCE(ssp->srcu_sup->srcu_gp_seq_needed_exp)))
+       if (ULONG_CMP_LT(READ_ONCE(sup->srcu_gp_seq), READ_ONCE(sup->srcu_gp_seq_needed_exp)))
                jbase = 0;
-       if (rcu_seq_state(READ_ONCE(ssp->srcu_sup->srcu_gp_seq))) {
+       if (rcu_seq_state(READ_ONCE(sup->srcu_gp_seq))) {
                j = jiffies - 1;
-               gpstart = READ_ONCE(ssp->srcu_sup->srcu_gp_start);
+               gpstart = READ_ONCE(sup->srcu_gp_start);
                if (time_after(j, gpstart))
                        jbase += j - gpstart;
                if (!jbase) {
-                       WRITE_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay, READ_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay) + 1);
-                       if (READ_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay) > srcu_max_nodelay_phase)
+                       WRITE_ONCE(sup->srcu_n_exp_nodelay, READ_ONCE(sup->srcu_n_exp_nodelay) + 1);
+                       if (READ_ONCE(sup->srcu_n_exp_nodelay) > srcu_max_nodelay_phase)
                                jbase = 1;
                }
        }