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Message-ID: <20231031202235.2655333-2-ben.wolsieffer@hefring.com>
Date: Tue, 31 Oct 2023 16:22:36 -0400
From: Ben Wolsieffer <ben.wolsieffer@...ring.com>
To: linux-kernel@...r.kernel.org
Cc: Jan Kiszka <jan.kiszka@...mens.com>,
Kieran Bingham <kbingham@...nel.org>,
Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ben Wolsieffer <ben.wolsieffer@...ring.com>
Subject: [PATCH] scripts/gdb/vmalloc: disable on no-MMU
vmap_area does not exist on no-MMU, therefore the GDB scripts fail to
load:
Traceback (most recent call last):
File "<...>/vmlinux-gdb.py", line 51, in <module>
import linux.vmalloc
File "<...>/scripts/gdb/linux/vmalloc.py", line 14, in <module>
vmap_area_ptr_type = vmap_area_type.get_type().pointer()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "<...>/scripts/gdb/linux/utils.py", line 28, in get_type
self._type = gdb.lookup_type(self._name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
gdb.error: No struct type named vmap_area.
To fix this, disable the command and add an informative error message if
CONFIG_MMU is not defined, following the example of lx-slabinfo.
Fixes: 852622bf3616 ("scripts/gdb/vmalloc: add vmallocinfo support")
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@...ring.com>
---
scripts/gdb/linux/constants.py.in | 1 +
scripts/gdb/linux/vmalloc.py | 8 ++++++--
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in
index e3517d4ab8ec..b5ba9682fc6b 100644
--- a/scripts/gdb/linux/constants.py.in
+++ b/scripts/gdb/linux/constants.py.in
@@ -157,3 +157,4 @@ LX_CONFIG(CONFIG_STACKDEPOT)
LX_CONFIG(CONFIG_PAGE_OWNER)
LX_CONFIG(CONFIG_SLUB_DEBUG)
LX_CONFIG(CONFIG_SLAB_FREELIST_HARDENED)
+LX_CONFIG(CONFIG_MMU)
diff --git a/scripts/gdb/linux/vmalloc.py b/scripts/gdb/linux/vmalloc.py
index 48e4a4fae7bb..d3c8a0274d1e 100644
--- a/scripts/gdb/linux/vmalloc.py
+++ b/scripts/gdb/linux/vmalloc.py
@@ -10,8 +10,9 @@ import gdb
import re
from linux import lists, utils, stackdepot, constants, mm
-vmap_area_type = utils.CachedType('struct vmap_area')
-vmap_area_ptr_type = vmap_area_type.get_type().pointer()
+if constants.LX_CONFIG_MMU:
+ vmap_area_type = utils.CachedType('struct vmap_area')
+ vmap_area_ptr_type = vmap_area_type.get_type().pointer()
def is_vmalloc_addr(x):
pg_ops = mm.page_ops().ops
@@ -25,6 +26,9 @@ class LxVmallocInfo(gdb.Command):
super(LxVmallocInfo, self).__init__("lx-vmallocinfo", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
+ if not constants.LX_CONFIG_MMU:
+ raise gdb.GdbError("Requires MMU support")
+
vmap_area_list = gdb.parse_and_eval('vmap_area_list')
for vmap_area in lists.list_for_each_entry(vmap_area_list, vmap_area_ptr_type, "list"):
if not vmap_area['vm']:
--
2.42.0
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