linux-kernel - [tip: timers/core] timekeeping: Consolidate timekeeping helpers

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Date: Mon, 08 Apr 2024 13:10:34 -0000
From: "tip-bot2 for Adrian Hunter" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 Adrian Hunter <adrian.hunter@...el.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/core] timekeeping: Consolidate timekeeping helpers

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

Commit-ID:     e84f43e34faf85816587f80594541ec978449d6e
Gitweb:        https://git.kernel.org/tip/e84f43e34faf85816587f80594541ec978449d6e
Author:        Adrian Hunter <adrian.hunter@...el.com>
AuthorDate:    Mon, 25 Mar 2024 08:40:18 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 08 Apr 2024 15:03:08 +02:00

timekeeping: Consolidate timekeeping helpers

Consolidate timekeeping helpers, making use of timekeeping_cycles_to_ns()
in preference to directly using timekeeping_delta_to_ns().

No functional change.

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20240325064023.2997-15-adrian.hunter@intel.com

---
 kernel/time/timekeeping.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 618328c..1bbfe1f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -237,7 +237,9 @@ static void timekeeping_check_update(struct timekeeper *tk, u64 offset)
 	}
 }
 
-static inline u64 timekeeping_debug_get_delta(const struct tk_read_base *tkr)
+static inline u64 timekeeping_cycles_to_ns(const struct tk_read_base *tkr, u64 cycles);
+
+static inline u64 timekeeping_debug_get_ns(const struct tk_read_base *tkr)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	u64 now, last, mask, max, delta;
@@ -266,22 +268,22 @@ static inline u64 timekeeping_debug_get_delta(const struct tk_read_base *tkr)
 	 */
 	if (unlikely((~delta & mask) < (mask >> 3))) {
 		tk->underflow_seen = 1;
-		delta = 0;
+		now = last;
 	}
 
 	/* Cap delta value to the max_cycles values to avoid mult overflows */
 	if (unlikely(delta > max)) {
 		tk->overflow_seen = 1;
-		delta = tkr->clock->max_cycles;
+		now = last + max;
 	}
 
-	return delta;
+	return timekeeping_cycles_to_ns(tkr, now);
 }
 #else
 static inline void timekeeping_check_update(struct timekeeper *tk, u64 offset)
 {
 }
-static inline u64 timekeeping_debug_get_delta(const struct tk_read_base *tkr)
+static inline u64 timekeeping_debug_get_ns(const struct tk_read_base *tkr)
 {
 	BUG();
 }
@@ -389,7 +391,7 @@ static __always_inline u64 __timekeeping_get_ns(const struct tk_read_base *tkr)
 static inline u64 timekeeping_get_ns(const struct tk_read_base *tkr)
 {
 	if (IS_ENABLED(CONFIG_DEBUG_TIMEKEEPING))
-		return timekeeping_delta_to_ns(tkr, timekeeping_debug_get_delta(tkr));
+		return timekeeping_debug_get_ns(tkr);
 
 	return __timekeeping_get_ns(tkr);
 }