linux-kernel - [PATCH 13/18] scripts/gdb: Add documentation example for radix tree

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Message-Id: <e786008ac5aec4b84198812805b326d718bdeb4b.1462865983.git.jan.kiszka@siemens.com>
Date:	Tue, 10 May 2016 09:39:38 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Kieran Bingham <kieran.bingham@...aro.org>,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: [PATCH 13/18] scripts/gdb: Add documentation example for radix tree

From: Kieran Bingham <kieran.bingham@...aro.org>

Provide a worked example for utilising the lx_radix_tree_lookup function

Cc: Jonathan Corbet <corbet@....net>
Cc: linux-doc@...r.kernel.org

Signed-off-by: Kieran Bingham <kieran.bingham@...aro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 Documentation/gdb-kernel-debugging.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/gdb-kernel-debugging.txt b/Documentation/gdb-kernel-debugging.txt
index 7050ce8..4ab7d43 100644
--- a/Documentation/gdb-kernel-debugging.txt
+++ b/Documentation/gdb-kernel-debugging.txt
@@ -139,6 +139,27 @@ Examples of using the Linux-provided gdb helpers
       start_comm = "swapper/2\000\000\000\000\000\000"
     }
 
+ o Dig into a radix tree data structure, such as the IRQ descriptors:
+    (gdb) print (struct irq_desc)$lx_radix_tree_lookup(irq_desc_tree, 18)
+    $6 = {
+      irq_common_data = {
+        state_use_accessors = 67584,
+        handler_data = 0x0 <__vectors_start>,
+        msi_desc = 0x0 <__vectors_start>,
+        affinity = {{
+            bits = {65535}
+          }}
+      },
+      irq_data = {
+        mask = 0,
+        irq = 18,
+        hwirq = 27,
+        common = 0xee803d80,
+        chip = 0xc0eb0854 <gic_data>,
+        domain = 0xee808000,
+        parent_data = 0x0 <__vectors_start>,
+        chip_data = 0xc0eb0854 <gic_data>
+      } <... trimmed ...>
 
 List of commands and functions
 ------------------------------
-- 
2.1.4