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Star64_linux/arch/x86
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Peter Zijlstra 3896c329df x86, tsc: Fix cpufreq lockup 
Mauro reported that his AMD X2 using the powernow-k8 cpufreq driver
locked up when doing cpu hotplug.

Because we called set_cyc2ns_scale() from the time_cpufreq_notifier()
unconditionally, it gets called multiple times for each freq change,
instead of only the once, when the tsc_khz value actually changes.

Because it gets called more than once, we run out of cyc2ns data slots
and stall, waiting for a free one, but because we're half way offline,
there's no consumers to free slots.

By placing the call inside the condition that actually changes tsc_khz
we avoid superfluous calls and avoid the problem.

Reported-by: Mauro <registosites@hotmail.com>
Tested-by: Mauro <registosites@hotmail.com>
Fixes: 20d1c86a57 ("sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs")
Cc: <stable@vger.kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Bin Gao <bin.gao@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-07-02 08:33:47 +02:00
..
boot x86, kaslr: boot-time selectable with hibernation 2014-06-16 23:30:44 +02:00
configs
crypto
ia32
include nmi: provide the option to issue an NMI back trace to every cpu but current 2014-06-23 16:47:44 -07:00
kernel x86, tsc: Fix cpufreq lockup 2014-07-02 08:33:47 +02:00
kvm At over 200 commits, covering almost all supported architectures, this 2014-06-04 08:47:12 -07:00
lguest
lib Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-06-12 19:18:49 -07:00
math-emu
mm Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-06-12 19:18:49 -07:00
net net: filter: cleanup A/X name usage 2014-06-11 00:13:16 -07:00
oprofile
pci x86: enable DMA CMA with swiotlb 2014-06-04 16:53:57 -07:00
platform x86: intel-mid: add watchdog platform code for Merrifield 2014-06-10 21:48:20 +02:00
power
realmode
syscalls
tools
um
vdso x86/vdso: Error out in vdso2c if DT_RELA is present 2014-06-24 13:53:57 -07:00
video
xen xen: regression and PVH fixes for 3.16-rc1 2014-06-19 07:53:27 -10:00
.gitignore
Kbuild
Kconfig x86, kaslr: boot-time selectable with hibernation 2014-06-16 23:30:44 +02:00
Kconfig.cpu
Kconfig.debug
Makefile
Makefile.um
Makefile_32.cpu