xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rcu: Open-code the rcu_cblist_n_cbs() function

Browse Source 
Because the rcu_cblist_n_cbs() just samples the ->len counter, and
because the rcu_cblist structure is quite straightforward, it makes
sense to open-code rcu_cblist_n_cbs(p) as p->len, cutting out a level
of indirection.  This commit makes this change.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul E. McKenney
2017-05-02 08:45:25 -07:00
parent 8ef0f37efb
commit 4b27f20b40
4 changed files with 6 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/rcu/tree.c
View File

@@ -2633,9 +2633,8 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp, unsigned long flags)
return;
/* Do the accounting first. */
rdp->n_cbs_adopted += rcu_cblist_n_cbs(&rsp->orphan_done);
if (rcu_cblist_n_lazy_cbs(&rsp->orphan_done) !=
rcu_cblist_n_cbs(&rsp->orphan_done))
rdp->n_cbs_adopted += rsp->orphan_done.len;
if (rcu_cblist_n_lazy_cbs(&rsp->orphan_done) != rsp->orphan_done.len)
rcu_idle_count_callbacks_posted();
rcu_segcblist_insert_count(&rdp->cblist, &rsp->orphan_done);
@@ -2792,14 +2791,14 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
* Stop only if limit reached and CPU has something to do.
* Note: The rcl structure counts down from zero.
*/
if (-rcu_cblist_n_cbs(&rcl) >= bl &&
if (-rcl.len >= bl &&
(need_resched() ||
(!is_idle_task(current) && !rcu_is_callbacks_kthread())))
break;
}
local_irq_save(flags);
count = -rcu_cblist_n_cbs(&rcl);
count = -rcl.len;
trace_rcu_batch_end(rsp->name, count, !!rcl.head, need_resched(),
is_idle_task(current), rcu_is_callbacks_kthread());