x86: fix boot on uniprocessor systems
authorArtem Fetishev <artem_fetishev@epam.com>
Fri, 28 Mar 2014 20:33:39 +0000 (13:33 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 28 Mar 2014 20:56:58 +0000 (13:56 -0700)
commit825600c0f20e595daaa7a6dd8970f84fa2a2ee57
treeae739547c15bb979d412c6eced02796310b04afb
parentd9060742fbf630fe31951dfc10b798deb2813f01
x86: fix boot on uniprocessor systems

On x86 uniprocessor systems topology_physical_package_id() returns -1
which causes rapl_cpu_prepare() to leave rapl_pmu variable uninitialized
which leads to GPF in rapl_pmu_init().

See arch/x86/kernel/cpu/perf_event_intel_rapl.c.

It turns out that physical_package_id and core_id can actually be
retreived for uniprocessor systems too.  Enabling them also fixes
rapl_pmu code.

Signed-off-by: Artem Fetishev <artem_fetishev@epam.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/include/asm/topology.h