There was lots of #ifdef noise in the kernel due to hotcpu_notifier(fn,
prio) not correctly marking 'fn' as used in the !HOTPLUG_CPU case, and thus
generating compiler warnings of unused symbols, hence forcing people to add
#ifdefs.

the compiler can skip truly unused functions just fine:

    text    data     bss     dec     hex filename
 1624412  728710 3674856 6027978  5bfaca vmlinux.before
 1624412  728710 3674856 6027978  5bfaca vmlinux.after

[akpm@osdl.org: topology.c fix]
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Get rid of warning in the thermal throttling code about not checking
sysfs return values.
Signed-off-by: NStephen Hemminger <shemminger@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

The counter is exported to /sys that keeps track of the
number of thermal events, such that the user knows how bad the
thermal problem might be (since the logging to syslog and mcelog
is rate limited).

AK: Fixed cpu hotplug locking
Signed-off-by: NDmitriy Zavin <dmitriyz@google.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

Signed-off-by: NDmitriy Zavin <dmitriyz@google.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

Refactor the event processing (syslog messaging and rate limiting)
into separate file therm_throt.c. This allows consistent reporting
of CPU thermal throttle events.

After ACK'ing the interrupt, if the event is current, the user
(p4.c/mce_intel.c) calls therm_throt_process to log (and rate limit)
the event. If that function returns 1, the user has the option to log
things further (such as to mce_log in x86_64).

AK: minor cleanup
Signed-off-by: NDmitriy Zavin <dmitriyz@google.com>
Signed-off-by: NAndi Kleen <ak@suse.de>