On Wed, Nov 30, 2016 at 04:44:52PM +0530, Siddhesh Poyarekar wrote:

On Thursday 24 November 2016 07:10 PM, Suzuki K Poulose wrote:

quoted

+ d) CPU Identification :
+    MIDR_EL1 is exposed to help identify the processor. On a
+    heterogeneous system, this could be racy (just like getcpu()). The
+    process could be migrated to another CPU by the time it uses the
+    register value, unless the CPU affinity is set. Hence, there is no
+    guarantee that the value reflects the processor that it is
+    currently executing on. The REVIDR is not exposed due to this
+    constraint, as REVIDR makes sense only in conjunction with the
+    MIDR. Alternately, MIDR_EL1 and REVIDR_EL1 are exposed via sysfs
+    at:
+
+	/sys/devices/system/cpu/cpu$ID/regs/identification/
+	                                              \- midr
+	                                              \- revidr
+

This doesn't seem to be implemented in this patchset.

No. However, we merged the functionality above already and forgot about
the documentation part, so we just clarify it now.

-- 
Catalin