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scripts/gdb: add documentation example for radix tree 

Provide a worked example for utilising the lx_radix_tree_lookup function

Link: http://lkml.kernel.org/r/e786008ac5aec4b84198812805b326d718bdeb4b.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kieran Bingham 2016-05-23 16:25:10 -07:00 committed by Linus Torvalds
parent e127a73d41
commit 9b5580359a
1 changed files with 21 additions and 0 deletions
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21
Documentation/gdb-kernel-debugging.txt
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@ -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
------------------------------