https://github.com/torvalds/linux
Revision 825600c0f20e595daaa7a6dd8970f84fa2a2ee57 authored by Artem Fetishev on 28 March 2014, 20:33:39 UTC, committed by Linus Torvalds on 28 March 2014, 20:56:58 UTC
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>
1 parent d906074
History
Tip revision: 825600c0f20e595daaa7a6dd8970f84fa2a2ee57 authored by Artem Fetishev on 28 March 2014, 20:33:39 UTC
x86: fix boot on uniprocessor systems
Tip revision: 825600c
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