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[PATCHv4 11/12] scripts/gdb: Add documentation example for radix tree

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Provide a worked example for utilising the lx_radix_tree_lookup function

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

Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org>
---
 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 7050ce8794b9..4ab7d43d0754 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
 ------------------------------
-- 
2.5.0

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[PATCHv4 00/12] gdb/scripts: Linux awareness debug commands Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 10/12] scripts/gdb: Add a Radix Tree Parser Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 12/12] scripts/gdb: Add lx_thread_info_by_pid helper Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 05/12] scripts/gdb: Support !CONFIG_MODULES gracefully Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 09/12] scripts/gdb: Add cpu iterators Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 01/12] scripts/gdb: Provide linux constants Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
    Re: [PATCHv4 01/12] scripts/gdb: Provide linux constants Jan Kiszka <jan.kiszka@siemens.com> - 2016-03-30 23:10 +0200
  [PATCHv4 06/12] scripts/gdb: Provide a dentry_name VFS path helper Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 02/12] scripts/gdb: Provide kernel list item generators Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 07/12] scripts/gdb: Add io resource readers Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 08/12] scripts/gdb: Add mount point list command Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 11/12] scripts/gdb: Add documentation example for radix tree Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 04/12] scripts/gdb: Provide exception catching parser Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200
  [PATCHv4 03/12] scripts/gdb: Convert modules usage to lists functions Kieran Bingham <kieran.bingham@linaro.org> - 2016-03-30 14:10 +0200

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