linux-kernel - [RFC][PATCH 7/9] cpuidle: Annotate poll

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Date:   Thu, 19 May 2022 23:27:57 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     frederic@...nel.org, paulmck@...nel.org, rjw@...ysocki.net,
        x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        jpoimboe@...nel.org
Subject: [RFC][PATCH 7/9] cpuidle: Annotate poll_idle()

The __cpuidle functions will become a noinstr class, as such they need
explicit annotations.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 drivers/cpuidle/poll_state.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/cpuidle/poll_state.c
+++ b/drivers/cpuidle/poll_state.c
@@ -13,7 +13,10 @@
 static int __cpuidle poll_idle(struct cpuidle_device *dev,
 			       struct cpuidle_driver *drv, int index)
 {
-	u64 time_start = local_clock();
+	u64 time_start;
+
+	instrumentation_begin();
+	time_start = local_clock();
 
 	dev->poll_time_limit = false;
 
@@ -37,6 +40,7 @@ static int __cpuidle poll_idle(struct cp
 		}
 	}
 	current_clr_polling();
+	instrumentation_end();
 
 	return index;
 }