Provide a worked example for utilising the lx_radix_tree_lookup function
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxx>
---
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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