linux-kernel - [PATCH v2 1/4] timens: additional helper function to add boottime in nsec

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Message-Id: <20201008053944.32718-2-michael.weiss@aisec.fraunhofer.de>
Date:   Thu,  8 Oct 2020 07:39:41 +0200
From:   Michael Weiß <michael.weiss@...ec.fraunhofer.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org,
        Michael Weiß <michael.weiss@...ec.fraunhofer.de>
Subject: [PATCH v2 1/4] timens: additional helper function to add boottime in nsec

Provide a helper function to apply the boottime offset to u64 types
in nanoseconds.

Signed-off-by: Michael Weiß <michael.weiss@...ec.fraunhofer.de>
---
 include/linux/time_namespace.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
index 5b6031385db0..5372181010f9 100644
--- a/include/linux/time_namespace.h
+++ b/include/linux/time_namespace.h
@@ -77,6 +77,13 @@ static inline void timens_add_boottime(struct timespec64 *ts)
 	*ts = timespec64_add(*ts, ns_offsets->boottime);
 }
 
+static inline u64 timens_add_boottime_ns(u64 nsec)
+{
+	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
+
+	return nsec + timespec64_to_ns(&ns_offsets->boottime);
+}
+
 ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
 				struct timens_offsets *offsets);
 
@@ -130,6 +137,12 @@ static inline int timens_on_fork(struct nsproxy *nsproxy,
 
 static inline void timens_add_monotonic(struct timespec64 *ts) { }
 static inline void timens_add_boottime(struct timespec64 *ts) { }
+
+static inline u64 timens_add_boottime_ns(u64 nsec)
+{
+	return nsec;
+}
+
 static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
 {
 	return tim;
-- 
2.20.1