x86/mce: Make timer handling more robust

Erik reported that on a preproduction hardware a CMCI storm triggers the
BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is
started by the CMCI logic before the MCE CPU hotplug callback starts the
timer with add_timer_on(). So the timer is already queued which triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola <erik.veijola@intel.com>
Tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

path: root/sound/sh/Kconfig

# ALSA SH drivers

menuconfig SND_SUPERH
	bool "SUPERH sound devices"
	depends on SUPERH
	default y
	help
	  Support for sound devices specific to SUPERH architectures.
	  Drivers that are implemented on ASoC can be found in
	  "ALSA for SoC audio support" section.

if SND_SUPERH

config SND_AICA
	tristate "Dreamcast Yamaha AICA sound"
	depends on SH_DREAMCAST
	select SND_PCM
	select G2_DMA
	help
	  ALSA Sound driver for the SEGA Dreamcast console.

config SND_SH_DAC_AUDIO
	tristate "SuperH DAC audio support"
	depends on SND
	depends on CPU_SH3 && HIGH_RES_TIMERS
	select SND_PCM
	help
	  Say Y here to include support for the on-chip DAC.

endif	# SND_SUPERH