From: Fenghua Yu <fenghua...@intel.com>

Add an ABI document entry for /sys/devices/system/cpu/cpu*/cache/index*/id.

Signed-off-by: Fenghua Yu <fenghua...@intel.com>
Reviewed-by: Tony Luck <tony.l...@intel.com>
Acked-by: Borislav Petkov <b...@suse.com>
---
 Documentation/ABI/testing/sysfs-devices-system-cpu | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu 
b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 4987417..d5d99dc 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -272,6 +272,23 @@ Description:       Parameters for the CPU cache attributes
                                     the modified cache line is written to main
                                     memory only when it is replaced
 
+
+What:          /sys/devices/system/cpu/cpu*/cache/index*/id
+Date:          July 2016
+Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:   Cache id
+
+               The id identifies a hardware cache of the system within a given
+               cache index in a set of cache indices. The "index" name is
+               simply a nomenclature from CPUID's leaf 4 which enumerates all
+               caches on the system by referring to each one as a cache index.
+               The (cache index, cache id) pair is unique for the whole
+               system.
+
+               Currently id is implemented on x86. On other platforms, id is
+               not enabled yet.
+
+
 What:          /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats
                /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/turbo_stat
                
/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/sub_turbo_stat
-- 
2.5.0

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