linux-kernel - [GIT pull] timer fixes for 4.2

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Message-ID: <alpine.DEB.2.11.1508221103510.3873@nanos>
Date:	Sat, 22 Aug 2015 11:08:15 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [GIT pull] timer fixes for 4.2

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

Two minimalistic fixes for 4.2 regressions:

 - Eric fixed a thinko in the timer_list base switching code caused by
   the overhaul of the timer wheel. It can cause a cpu to see the
   wrong base for a timer while we move the timer around.

 - Guenter fixed a regression for IMX if booted w/o device tree, where
   the timer interrupt is not initialized and therefor the machine
   fails to boot.

Thanks,

	tglx

------------------>
Eric Dumazet (1):
      timer: Write timer->flags atomically

Guenter Roeck (1):
      clocksource/imx: Fix boot with non-DT systems


 drivers/clocksource/timer-imx-gpt.c | 1 +
 kernel/time/timer.c                 | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index 2d59038dec43..86c7eb66bdfb 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -462,6 +462,7 @@ void __init mxc_timer_init(unsigned long pbase, int irq, enum imx_gpt_type type)
 	BUG_ON(!imxtm->base);
 
 	imxtm->type = type;
+	imxtm->irq = irq;
 
 	_mxc_timer_init(imxtm);
 }
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 5e097fa9faf7..84190f02b521 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -807,8 +807,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
 			spin_unlock(&base->lock);
 			base = new_base;
 			spin_lock(&base->lock);
-			timer->flags &= ~TIMER_BASEMASK;
-			timer->flags |= base->cpu;
+			WRITE_ONCE(timer->flags,
+				   (timer->flags & ~TIMER_BASEMASK) | base->cpu);
 		}
 	}
 
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