[Bug 77201] CPU online hangs, works when powernow-k8 is UN-loaded

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=77201

--- Comment #87 from Mauro <registosites@hotmail.com> ---
(In reply to Viresh Kumar from comment #86)
> Only one of these two will work for you. Check which one, I would put my 10
> cents on *-post1 branch :)

You should have bet more, *-post2 hangs, *-post1 works.

> Once, any one of the branches work for you, try doing a git bisect for that
> branch and 3.14 (Only few revert patches actually, should be easy).. 
> 
> And you can tell me which revert patch has *fixed* the issue for you and
> that's the culprit.

I had to skip the last step of the bisect as it fails to build, I'm attaching
the bisect log.

It fails with:
arch/x86/kernel/cpu/perf_event.c: In function ‘arch_perf_update_userpage’:
arch/x86/kernel/cpu/perf_event.c:1903:23: error: ‘CYC2NS_SCALE_FACTOR’
undeclared (first use in this function)
  userpg->time_shift = CYC2NS_SCALE_FACTOR;
                       ^
arch/x86/kernel/cpu/perf_event.c:1903:23: note: each undeclared identifier is
reported only once for each function it appears in
scripts/Makefile.build:308: recipe for target
'arch/x86/kernel/cpu/perf_event.o' failed
make[3]: *** [arch/x86/kernel/cpu/perf_event.o] Error 1
make[3]: *** Waiting for unfinished jobs....
  CC      kernel/printk/printk.o
scripts/Makefile.build:455: recipe for target 'arch/x86/kernel/cpu' failed
make[2]: *** [arch/x86/kernel/cpu] Error 2
scripts/Makefile.build:455: recipe for target 'arch/x86/kernel' failed
make[1]: *** [arch/x86/kernel] Error 2
Makefile:841: recipe for target 'arch/x86' failed
make: *** [arch/x86] Error 2

> 
> Then we can follow on LKML, will put you in CC, on the original commit
> threads..
> 
> Thanks for your dedication towards fixing this up, it was really a nightmare
> to get down to this :)

I'm just scratching my itch ;) I also have to thank you, and everyone else that
looked into this, it looks like this is not affecting many people and yet you
took the time and effort to track this down.

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