linux-kernel - [tip:timers/core] timekeeping: Make the conversion call chain consistently unsigned

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Message-ID: <tip-acc89612a70e370a5640fd77a83f15b7b94d85e4@git.kernel.org>
Date:   Fri, 9 Dec 2016 03:13:47 -0800
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     prarit@...hat.com, mingo@...nel.org, john.stultz@...aro.org,
        hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        richardcochran@...il.com, christopher.s.hall@...el.com,
        liavr@...lanox.com, peterz@...radead.org, cmetcalf@...lanox.com,
        david@...son.dropbear.id.au, lvivier@...hat.com
Subject: [tip:timers/core] timekeeping: Make the conversion call chain
 consistently unsigned

Commit-ID:  acc89612a70e370a5640fd77a83f15b7b94d85e4
Gitweb:     http://git.kernel.org/tip/acc89612a70e370a5640fd77a83f15b7b94d85e4
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 8 Dec 2016 20:49:34 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 9 Dec 2016 12:06:41 +0100

timekeeping: Make the conversion call chain consistently unsigned

Propagating a unsigned value through signed variables and functions makes
absolutely no sense and is just prone to (re)introduce subtle signed
vs. unsigned issues as happened recently.

Clean it up.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: David Gibson <david@...son.dropbear.id.au>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Parit Bhargava <prarit@...hat.com>
Cc: Laurent Vivier <lvivier@...hat.com>
Cc: "Christopher S. Hall" <christopher.s.hall@...el.com>
Cc: Chris Metcalf <cmetcalf@...lanox.com>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Liav Rehana <liavr@...lanox.com>
Cc: John Stultz <john.stultz@...aro.org>
Link: http://lkml.kernel.org/r/20161208204228.765843099@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 kernel/time/timekeeping.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index bfe589e..5244821 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -311,7 +311,7 @@ static inline u64 timekeeping_delta_to_ns(struct tk_read_base *tkr,
 	return nsec + arch_gettimeoffset();
 }
 
-static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
+static inline u64 timekeeping_get_ns(struct tk_read_base *tkr)
 {
 	cycle_t delta;
 
@@ -319,8 +319,8 @@ static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
 	return timekeeping_delta_to_ns(tkr, delta);
 }
 
-static inline s64 timekeeping_cycles_to_ns(struct tk_read_base *tkr,
-					    cycle_t cycles)
+static inline u64 timekeeping_cycles_to_ns(struct tk_read_base *tkr,
+					   cycle_t cycles)
 {
 	cycle_t delta;
 
@@ -652,7 +652,7 @@ static void timekeeping_forward_now(struct timekeeper *tk)
 {
 	struct clocksource *clock = tk->tkr_mono.clock;
 	cycle_t cycle_now, delta;
-	s64 nsec;
+	u64 nsec;
 
 	cycle_now = tk->tkr_mono.read(clock);
 	delta = clocksource_delta(cycle_now, tk->tkr_mono.cycle_last, tk->tkr_mono.mask);
@@ -681,7 +681,7 @@ int __getnstimeofday64(struct timespec64 *ts)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	unsigned long seq;
-	s64 nsecs = 0;
+	u64 nsecs;
 
 	do {
 		seq = read_seqcount_begin(&tk_core.seq);
@@ -721,7 +721,7 @@ ktime_t ktime_get(void)
 	struct timekeeper *tk = &tk_core.timekeeper;
 	unsigned int seq;
 	ktime_t base;
-	s64 nsecs;
+	u64 nsecs;
 
 	WARN_ON(timekeeping_suspended);
 
@@ -764,7 +764,7 @@ ktime_t ktime_get_with_offset(enum tk_offsets offs)
 	struct timekeeper *tk = &tk_core.timekeeper;
 	unsigned int seq;
 	ktime_t base, *offset = offsets[offs];
-	s64 nsecs;
+	u64 nsecs;
 
 	WARN_ON(timekeeping_suspended);
 
@@ -808,7 +808,7 @@ ktime_t ktime_get_raw(void)
 	struct timekeeper *tk = &tk_core.timekeeper;
 	unsigned int seq;
 	ktime_t base;
-	s64 nsecs;
+	u64 nsecs;
 
 	do {
 		seq = read_seqcount_begin(&tk_core.seq);
@@ -833,8 +833,8 @@ void ktime_get_ts64(struct timespec64 *ts)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	struct timespec64 tomono;
-	s64 nsec;
 	unsigned int seq;
+	u64 nsec;
 
 	WARN_ON(timekeeping_suspended);
 
@@ -922,8 +922,8 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
 	unsigned long seq;
 	ktime_t base_raw;
 	ktime_t base_real;
-	s64 nsec_raw;
-	s64 nsec_real;
+	u64 nsec_raw;
+	u64 nsec_real;
 	cycle_t now;
 
 	WARN_ON_ONCE(timekeeping_suspended);
@@ -1081,7 +1081,7 @@ int get_device_system_crosststamp(int (*get_time_fn)
 	cycle_t cycles, now, interval_start;
 	unsigned int clock_was_set_seq = 0;
 	ktime_t base_real, base_raw;
-	s64 nsec_real, nsec_raw;
+	u64 nsec_real, nsec_raw;
 	u8 cs_was_changed_seq;
 	unsigned long seq;
 	bool do_interp;
@@ -1394,7 +1394,7 @@ void getrawmonotonic64(struct timespec64 *ts)
 	struct timekeeper *tk = &tk_core.timekeeper;
 	struct timespec64 ts64;
 	unsigned long seq;
-	s64 nsecs;
+	u64 nsecs;
 
 	do {
 		seq = read_seqcount_begin(&tk_core.seq);