linux-kernel - [patch 17/20] posix-timers: Clarify posix_timer

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Date:   Tue, 25 Apr 2023 20:49:22 +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 17/20] posix-timers: Clarify posix_timer_rearm() comment

Yet another incomprehensible piece of art.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/posix-timers.c |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -274,15 +274,9 @@ static void common_hrtimer_rearm(struct
 }
 
 /*
- * This function is exported for use by the signal deliver code.  It is
- * called just prior to the info block being released and passes that
- * block to us.  It's function is to update the overrun entry AND to
- * restart the timer.  It should only be called if the timer is to be
- * restarted (i.e. we have flagged this in the sys_private entry of the
- * info block).
- *
- * To protect against the timer going away while the interrupt is queued,
- * we require that the it_requeue_pending flag be set.
+ * This function is called from the signal delivery code if
+ * info->si_sys_private is not zero, which indicates that the timer has to
+ * be rearmed. Restart the timer and update info::si_overrun.
  */
 void posixtimer_rearm(struct kernel_siginfo *info)
 {