netdev - [PATCH 2/7] Function to retrieve main clock state

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Date:   Thu,  1 Oct 2020 22:51:36 +0200
From:   Erez Geva <erez.geva.ext@...mens.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>, Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Cochran <richardcochran@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vladis Dronov <vdronov@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Vedang Patel <vedang.patel@...el.com>,
        Simon Sudler <simon.sudler@...mens.com>,
        Andreas Meisinger <andreas.meisinger@...mens.com>,
        Andreas Bucher <andreas.bucher@...mens.com>,
        Henning Schild <henning.schild@...mens.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Andreas Zirkler <andreas.zirkler@...mens.com>,
        Ermin Sakic <ermin.sakic@...mens.com>,
        An Ninh Nguyen <anninh.nguyen@...mens.com>,
        Michael Saenger <michael.saenger@...mens.com>,
        Bernd Maehringer <bernd.maehringer@...mens.com>,
        Gisela Greinert <gisela.greinert@...mens.com>,
        Erez Geva <erez.geva.ext@...mens.com>,
        Erez Geva <ErezGeva2@...il.com>
Subject: [PATCH 2/7] Function to retrieve main clock state

Add kernel function to retrieve main clock oscillator state.
As calibration is done from user space daemon,
the kernel access function permit read only.

Signed-off-by: Erez Geva <erez.geva.ext@...mens.com>
---
 include/linux/timex.h     | 1 +
 kernel/time/timekeeping.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/linux/timex.h b/include/linux/timex.h
index ce0859763670..03bc63bf3073 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -153,6 +153,7 @@ extern unsigned long tick_nsec;		/* SHIFTED_HZ period (nsec) */
 
 extern int do_adjtimex(struct __kernel_timex *);
 extern int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex * ktx);
+extern int adjtimex(struct __kernel_timex *txc);
 
 extern void hardpps(const struct timespec64 *, const struct timespec64 *);
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 4c47f388a83f..2248fa257ff8 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2372,6 +2372,15 @@ int do_adjtimex(struct __kernel_timex *txc)
 	return ret;
 }
 
+int adjtimex(struct __kernel_timex *txc)
+{
+	if (txc->modes != 0)
+		return -EINVAL;
+
+	return do_adjtimex(txc);
+}
+EXPORT_SYMBOL_GPL(adjtimex);
+
 #ifdef CONFIG_NTP_PPS
 /**
  * hardpps() - Accessor function to NTP __hardpps function
-- 
2.20.1