linux-kernel - [GIT pull] timer updates for 4.14

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Message-ID: <alpine.DEB.2.20.1710011158200.3874@nanos>
Date:   Sun, 1 Oct 2017 12:07:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [GIT pull] timer updates for 4.14

Linus,

please pull the latest timers-urgent-for-linus git tree from:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-urgent-for-linus

This adds a new timer wheel function which is required for the conversion
of the timer callback function from the 'unsigned long data' argument to
'struct timer_list *timer'. This conversion has two benefits:

 1) It makes struct timer_list smaller
 
 2) Many callers hand in a pointer to the timer or to the structure
    containing the timer, which happens via type casting both at setup
    and in the callback. This change gets rid of the typecasts.

Once the conversion is complete, which is planned for 4.15, the old setup
function and the intermediate typecast in the new setup function go away
along with the data field in struct timer_list.

Merging this now into mainline allows a smooth queueing of the actual
conversion in the affected maintainer trees without creating dependencies.

Thanks,

	tglx

------------------>
Kees Cook (1):
      timer: Prepare to change timer callback argument type

Thomas Gleixner (1):
      um/time: Fixup namespace collision


 arch/um/kernel/time.c |  4 ++--
 include/linux/timer.h | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 0b034ebbda2a..7f69d17de354 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -98,7 +98,7 @@ static struct clocksource timer_clocksource = {
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-static void __init timer_setup(void)
+static void __init um_timer_setup(void)
 {
 	int err;
 
@@ -132,5 +132,5 @@ void read_persistent_clock(struct timespec *ts)
 void __init time_init(void)
 {
 	timer_set_signal_handler();
-	late_time_init = timer_setup;
+	late_time_init = um_timer_setup;
 }
diff --git a/include/linux/timer.h b/include/linux/timer.h
index e6789b8757d5..6383c528b148 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -168,6 +168,20 @@ static inline void init_timer_on_stack_key(struct timer_list *timer,
 #define setup_pinned_deferrable_timer_on_stack(timer, fn, data)		\
 	__setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE | TIMER_PINNED)
 
+#define TIMER_DATA_TYPE		unsigned long
+#define TIMER_FUNC_TYPE		void (*)(TIMER_DATA_TYPE)
+
+static inline void timer_setup(struct timer_list *timer,
+			       void (*callback)(struct timer_list *),
+			       unsigned int flags)
+{
+	__setup_timer(timer, (TIMER_FUNC_TYPE)callback,
+		      (TIMER_DATA_TYPE)timer, flags);
+}
+
+#define from_timer(var, callback_timer, timer_fieldname) \
+	container_of(callback_timer, typeof(*var), timer_fieldname)
+
 /**
  * timer_pending - is a timer pending?
  * @timer: the timer in question