This patch remove use of temporary variable 'ip' which optimizes the code and results in
reduction of assembly instructions and hence improves latency.
Benefit of 18 lines of assembly instructions is observed on e6500 core.
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@xxxxxxxxxxxxx>
---
kernel/sched/core.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8749d20..cdf43f8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2296,13 +2296,16 @@ void __kprobes add_preempt_count(int val)
DEBUG_LOCKS_WARN_ON((preempt_count() & PREEMPT_MASK) >=
PREEMPT_MASK - 10);
#endif
- if (preempt_count() == val) {
- unsigned long ip = get_parent_ip(CALLER_ADDR1);
+
+ if (preempt_count() == val)
#ifdef CONFIG_DEBUG_PREEMPT
- current->preempt_disable_ip = ip;
+ trace_preempt_off(CALLER_ADDR0,
+ current->preempt_disable_ip =
+ get_parent_ip(CALLER_ADDR1));
+#else
+ trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
#endif
- trace_preempt_off(CALLER_ADDR0, ip);
- }
+
}
EXPORT_SYMBOL(add_preempt_count);
--
1.7.10.4
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