linux-kernel - [PATCH 1/3] scripts/gdb: Add hlist utilities

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Message-ID: <aede2c05c333fd599252a74e67904ff7847b0dcf.1555921081.git.leonard.crestez@nxp.com>
Date:   Mon, 22 Apr 2019 08:26:56 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] scripts/gdb: Add hlist utilities

This allows easily examining kernel hlists in python.

Signed-off-by: Leonard Crestez <leonard.crestez@....com>
---
 scripts/gdb/linux/lists.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index 1987d756b36b..55356b66f8ea 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -14,10 +14,12 @@
 import gdb
 
 from linux import utils
 
 list_head = utils.CachedType("struct list_head")
+hlist_head = utils.CachedType("struct hlist_head")
+hlist_node = utils.CachedType("struct hlist_node")
 
 
 def list_for_each(head):
     if head.type == list_head.get_type().pointer():
         head = head.dereference()
@@ -37,10 +39,31 @@ def list_for_each_entry(head, gdbtype, member):
             raise TypeError("Type {} found. Expected struct list_head *."
                             .format(node.type))
         yield utils.container_of(node, gdbtype, member)
 
 
+def hlist_for_each(head):
+    if head.type == hlist_head.get_type().pointer():
+        head = head.dereference()
+    elif head.type != hlist_head.get_type():
+        raise gdb.GdbError("Must be struct hlist_head not {}"
+                           .format(head.type))
+
+    node = head['first'].dereference()
+    while node.address:
+        yield node.address
+        node = node['next'].dereference()
+
+
+def hlist_for_each_entry(head, gdbtype, member):
+    for node in hlist_for_each(head):
+        if node.type != hlist_node.get_type().pointer():
+            raise TypeError("Type {} found. Expected struct hlist_head *."
+                            .format(node.type))
+        yield utils.container_of(node, gdbtype, member)
+
+
 def list_check(head):
     nb = 0
     if (head.type == list_head.get_type().pointer()):
         head = head.dereference()
     elif (head.type != list_head.get_type()):
-- 
2.17.1