perf/x86/intel/cqm: Document PQR MSR abuse
The CQM code acts like it owns the PQR MSR completely. That's not true because only the lower 10 bits are used for CQM. The upper 32 bits are used for the 'CLass Of Service ID' (CLOSID). Document the abuse. Will be fixed in a later patch. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Acked-by: NMatt Fleming <matt.fleming@intel.com> Cc: Kanaka Juvva <kanaka.d.juvva@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com> Cc: Will Auld <will.auld@intel.com> Link: http://lkml.kernel.org/r/20150518235149.823214798@linutronix.deSigned-off-by: NIngo Molnar <mingo@kernel.org>
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