Export x86 cache topology

This patch adds get_shared_cpu_map(), which allows the caller to infer
which CPUs share a cache at a given level.

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 22224b3b43bb..254dd2b81632 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -173,6 +173,10 @@ void print_cpu_msr(struct cpuinfo_x86 *);
 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
+#ifdef CONFIG_SYSFS
+extern int get_shared_cpu_map(cpumask_var_t mask,
+                               unsigned int cpu, int index);
+#endif
 
 extern void detect_extended_topology(struct cpuinfo_x86 *c);
 extern void detect_ht(struct cpuinfo_x86 *c);