linux-kernel - [PATCH] x86/topology: Document cpu_llc

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Message-Id: <20160907092219.5523-1-bp@alien8.de>
Date:   Wed,  7 Sep 2016 11:22:19 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86/topology: Document cpu_llc_id

From: Borislav Petkov <bp@...e.de>

It means different things on Intel and AMD so write it down so that
there's no confusion.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 Documentation/x86/topology.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/x86/topology.txt b/Documentation/x86/topology.txt
index 06afac252f5b..7a5485730476 100644
--- a/Documentation/x86/topology.txt
+++ b/Documentation/x86/topology.txt
@@ -63,6 +63,12 @@ The topology of a system is described in the units of:
     The maximum possible number of packages in the system. Helpful for per
     package facilities to preallocate per package information.
 
+  - cpu_llc_id:
+
+    A per-CPU variable containing:
+    - On Intel, the first APIC ID of the list of CPUs sharing the Last Level
+    Cache
+    - On AMD, the Node ID containing the Last Level Cache.
 
 * Cores:
 
-- 
2.10.0