b077ffb3b7
There was OpenVZ specific bug rendering some cpufreq drivers unusable on SMP.
In short, when cpufreq code thinks it confined itself to needed cpu by means
of set_cpus_allowed() to execute rdmsr, some "virtual cpu" feature can migrate
process to anywhere. This triggers bugons and does wrong things in general.
This got fixed by introducing rdmsr_on_cpu and wrmsr_on_cpu executing rdmsr
and wrmsr on given physical cpu by means of smp_call_function_single().
Dave Jones mentioned cpufreq might be not only user of rdmsr_on_cpu() and
wrmsr_on_cpu(), so I'm putting them into arch/{i386,x86_64}/lib/ .
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
12 lines
211 B
Makefile
12 lines
211 B
Makefile
#
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# Makefile for i386-specific library files..
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#
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lib-y = checksum.o delay.o usercopy.o getuser.o putuser.o memcpy.o strstr.o \
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bitops.o semaphore.o
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lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
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obj-y = msr-on-cpu.o
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