linux-kernel - [PATCH v2 02/12] timekeeping: add API for getting timekeeping

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Message-Id: <20210928235635.1348330-3-willmcvicker@google.com>
Date:   Tue, 28 Sep 2021 23:56:19 +0000
From:   Will McVicker <willmcvicker@...gle.com>
To:     Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>,
        kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-rtc@...r.kernel.org
Subject: [PATCH v2 02/12] timekeeping: add API for getting timekeeping_suspended

This allows modules to access the value of timekeeping_suspended without
giving them write access to the variable.

Signed-off-by: Will McVicker <willmcvicker@...gle.com>
---
 include/linux/timekeeping.h |  1 +
 kernel/time/timekeeping.c   | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 78a98bdff76d..cdc84421d77b 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -8,6 +8,7 @@
 /* Included from linux/ktime.h */
 
 void timekeeping_init(void);
+extern bool timekeeping_is_suspended(void);
 extern int timekeeping_suspended;
 
 /* Architecture timer tick functions: */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index b348749a9fc6..27873c052e57 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -57,6 +57,17 @@ static struct timekeeper shadow_timekeeper;
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
 
+/**
+ * timekeeping_is_suspended - query for timekeeping_suspended
+ *
+ * Returns the true/false based on the value of timekeeping_suspened.
+ */
+bool timekeeping_is_suspended(void)
+{
+	return timekeeping_suspended ? true : false;
+}
+EXPORT_SYMBOL_GPL(timekeeping_is_suspended);
+
 /**
  * struct tk_fast - NMI safe timekeeper
  * @seq:	Sequence counter for protecting updates. The lowest bit
-- 
2.33.0.685.g46640cef36-goog