stable.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Anna-Maria Gleixner <anna-maria@linutronix.de>,
	Sebastian Siewior <bigeasy@linutronix.de>,
	Paul McKenney <paulmck@linux.vnet.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@kernel.org>,
	stable@vger.kernel.org, rt@linutronix.de
Subject: [patch 3/4] timer: Invoke timer_start_debug() where it makes sense
Date: Fri, 22 Dec 2017 15:51:14 +0100	[thread overview]
Message-ID: <20171222145337.792907137@linutronix.de> (raw)
In-Reply-To: 20171222145111.919609918@linutronix.de

[-- Attachment #1: timer--Invoke_timer_start_debug--_where_it_makes_sense.patch --]
[-- Type: text/plain, Size: 978 bytes --]

From: Thomas Gleixner <tglx@linutronix.de>

The timer start debug function is called before the proper timer base is
set. As a consequence the trace data contains the stale CPU and flags
values.

Call the debug function after setting the new base and flags.

Fixes: 500462a9de65 ("timers: Switch to a non-cascading wheel")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Cc: rt@linutronix.de

---
 kernel/time/timer.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1007,8 +1007,6 @@ static inline int
 	if (!ret && (options & MOD_TIMER_PENDING_ONLY))
 		goto out_unlock;
 
-	debug_activate(timer, expires);
-
 	new_base = get_target_base(base, timer->flags);
 
 	if (base != new_base) {
@@ -1032,6 +1030,8 @@ static inline int
 		}
 	}
 
+	debug_activate(timer, expires);
+
 	timer->expires = expires;
 	/*
 	 * If 'idx' was calculated above and the base time did not advance

      parent reply	other threads:[~2017-12-22 14:51 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20171222145111.919609918@linutronix.de>
2017-12-22 14:51 ` [patch 1/4] timer: Use deferrable base independent of base::nohz_active Thomas Gleixner
2017-12-25 16:24   ` Frederic Weisbecker
2017-12-22 14:51 ` [patch 2/4] nohz: Prevent erroneous tick stop invocations Thomas Gleixner
2017-12-26 15:17   ` Frederic Weisbecker
2017-12-27 18:22     ` Thomas Gleixner
2017-12-27 18:24       ` Thomas Gleixner
2017-12-27 20:58         ` Thomas Gleixner
2017-12-29 16:12           ` Frederic Weisbecker
2017-12-22 14:51 ` Thomas Gleixner [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20171222145337.792907137@linutronix.de \
    --to=tglx@linutronix.de \
    --cc=anna-maria@linutronix.de \
    --cc=bigeasy@linutronix.de \
    --cc=fweisbec@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=paulmck@linux.vnet.ibm.com \
    --cc=peterz@infradead.org \
    --cc=rt@linutronix.de \
    --cc=stable@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).