linux-kernel - [patch 14/20] posix-timers: Document nanosleep() details

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Date:   Tue, 25 Apr 2023 20:49:17 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        syzbot+5c54bd3eb218bb595aa9@...kaller.appspotmail.com,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Michael Kerrisk <mtk.manpages@...il.com>
Subject: [patch 14/20] posix-timers: Document nanosleep() details

The descriptions for common_nsleep() is wrong and common_nsleep_timens()
lacks any form of comment.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/posix-timers.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1376,7 +1376,7 @@ SYSCALL_DEFINE2(clock_getres_time32, clo
 #endif
 
 /*
- * nanosleep for monotonic and realtime clocks
+ * sys_clock_nanosleep() for CLOCK_REALTIME and CLOCK_TAI
  */
 static int common_nsleep(const clockid_t which_clock, int flags,
 			 const struct timespec64 *rqtp)
@@ -1388,8 +1388,13 @@ static int common_nsleep(const clockid_t
 				 which_clock);
 }
 
+/*
+ * sys_clock_nanosleep() for CLOCK_MONOTONIC and CLOCK_BOOTTIME
+ *
+ * Absolute nanosleeps for these clocks are time-namespace adjusted.
+ */
 static int common_nsleep_timens(const clockid_t which_clock, int flags,
-			 const struct timespec64 *rqtp)
+				const struct timespec64 *rqtp)
 {
 	ktime_t texp = timespec64_to_ktime(*rqtp);