linux-kernel - [tip: timers/urgent] timekeeping: Mark NMI safe time accessors as notrace

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Message-ID: <165118420512.4207.5310310414914439031.tip-bot2@tip-bot2>
Date:   Thu, 28 Apr 2022 22:16:45 -0000
From:   "tip-bot2 for Kurt Kanzenbach" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>, stable@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/urgent] timekeeping: Mark NMI safe time accessors as notrace

The following commit has been merged into the timers/urgent branch of tip:

Commit-ID:     2c33d775ef4c25c0e1e1cc0fd5496d02f76bfa20
Gitweb:        https://git.kernel.org/tip/2c33d775ef4c25c0e1e1cc0fd5496d02f76bfa20
Author:        Kurt Kanzenbach <kurt@...utronix.de>
AuthorDate:    Thu, 28 Apr 2022 08:24:32 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Fri, 29 Apr 2022 00:07:53 +02:00

timekeeping: Mark NMI safe time accessors as notrace

Mark the CLOCK_MONOTONIC fast time accessors as notrace. These functions are
used in tracing to retrieve timestamps, so they should not recurse.

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>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220426175338.3807ca4f@gandalf.local.home/
Link: https://lore.kernel.org/r/20220428062432.61063-1-kurt@linutronix.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 dcdcb85..3b1398f 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);
 }