x86/cpu: Add get_llc_id() helper function
Factor out a helper function rather than export cpu_llc_id, which is needed in order to be able to build the AMD uncore driver as a module. Signed-off-by: Kim Phillips <kim.phillips@amd.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210817221048.88063-7-kim.phillips@amd.com
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