linux-kernel - [PATCH] timekeeping: Mark mono fast time accessors as notrace

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Date:   Thu, 28 Apr 2022 08:24:32 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH] timekeeping: Mark mono fast time accessors as notrace

Mark the CLOCK_MONOTONIC fast time accessors as notrace. These functions are
used in tracing to retrieve timestamps.

Link: https://lore.kernel.org/r/20220426175338.3807ca4f@gandalf.local.home/
Fixes: 4498e7467e9e ("time: Parametrize all tk_fast_mono users")
Fixes: f09cb9a1808e ("time: Introduce tk_fast_raw")
Reported-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
---
 kernel/time/timekeeping.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2c22023fbf5f..dddc37035215 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -482,7 +482,7 @@ static __always_inline u64 __ktime_get_fast_ns(struct tk_fast *tkf)
  * of the following timestamps. Callers need to be aware of that and
  * deal with it.
  */
-u64 ktime_get_mono_fast_ns(void)
+u64 notrace ktime_get_mono_fast_ns(void)
 {
 	return __ktime_get_fast_ns(&tk_fast_mono);
 }
@@ -494,7 +494,7 @@ EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
  * Contrary to ktime_get_mono_fast_ns() this is always correct because the
  * conversion factor is not affected by NTP/PTP correction.
  */
-u64 ktime_get_raw_fast_ns(void)
+u64 notrace ktime_get_raw_fast_ns(void)
 {
 	return __ktime_get_fast_ns(&tk_fast_raw);
 }
-- 
2.30.2