clocksource: marco: Fix the affinity set for local timer of CPU1

irqchip will reject the affinity set to CPUs which is not online
yet. but in the CPU1 wakeup stage, OS only sets CPU1 to be online
after local timer is set, so that causes the irq_set_affinity not
work. this patch moves to irq_force_affinity() for the low level
boot stage.

Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
clocksource: tcb_clksrc: Make tc_mode interrupt safe

tc_mode() can be called from interrupt context and thus must not call
clk_*prepare*() functions.

Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
virtio_blk: fix race between start and stop queue

When there isn't enough vring descriptor for adding to vq,
blk-mq will be put as stopped state until some of pending
descriptors are completed & freed.

Unfortunately, the vq's interrupt may come just before
blk-mq's BLK_MQ_S_STOPPED flag is set, so the blk-mq will
still be kept as stopped even though lots of descriptors
are completed and freed in the interrupt handler. The worst
case is that all pending descriptors are freed in the
interrupt handler, and the queue is kept as stopped forever.

This patch fixes the problem by starting/stopping blk-mq
with holding vq_lock.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>

Conflicts:
	drivers/block/virtio_blk.c
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull two timer fixes from Thomas Gleixner:
 "Two small fixlets for ARM SoC clocksource drivers:

   - avoid calling functions which might sleep from interrupt [disabled]
     context in tcb_clksrc used on Atmel SoCs

   - use irq_force_affinity() to pin the per cpu timer interrupt on a
     not yet online cpu in the SiRFprimaII driver"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource: tcb_clksrc: Make tc_mode interrupt safe
  clocksource: marco: Fix the affinity set for local timer of CPU1
Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull virtio_blk fix from Jens Axboe:
 "There's a start/stop queue race in virtio_blk, which causes stalls and
  erratic behaviour for some.  I've had this queued up for 3.16 for a
  while, but I think we should push it into the current series as well.

  So I cherry picked the commit and added a stable marker as well, so it
  can propagate down"

* 'for-linus' of git://git.kernel.dk/linux-block:
  virtio_blk: fix race between start and stop queue