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Subject[PATCH 2/3] rcu: Remove fast path from __rcu_process_callbacks()
Date
The standard code path accommodates a condition when no
RCU callbacks are ready to invoke. Since size of the code
is a priority for tiny RCU, remove the fast path.

Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
kernel/rcu/tiny.c | 11 -----------
1 file changed, 11 deletions(-)

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index d4e7fe5..069742d 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -168,17 +168,6 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
unsigned long flags;
RCU_TRACE(int cb_count = 0);

- /* If no RCU callbacks ready to invoke, just return. */
- if (&rcp->rcucblist == rcp->donetail) {
- RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, 0, -1));
- RCU_TRACE(trace_rcu_batch_end(rcp->name, 0,
- !!ACCESS_ONCE(rcp->rcucblist),
- need_resched(),
- is_idle_task(current),
- false));
- return;
- }
-
/* Move the ready-to-invoke callbacks to a local list. */
local_irq_save(flags);
RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, rcp->qlen, -1));
--
1.8.3.1


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