linux-kernel - [PATCH] scripts/gdb: change kernel config dumping method

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Message-ID: <20220610071500.9656-1-Kuan-Ying.Lee@mediatek.com>
Date:   Fri, 10 Jun 2022 15:14:57 +0800
From:   Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     <chinwen.chang@...iatek.com>, <nicholas.tang@...iatek.com>,
        <casper.li@...iatek.com>, <andrew.yang@...iatek.com>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH] scripts/gdb: change kernel config dumping method

MAGIC_START("IKCFG_ST") and MAGIC_END("IKCFG_ED") are moved out
from the kernel_config_data variable [1].

Thus, we parse kernel_config_data directly instead of considering
offset of MAGIC_START and MAGIC_END.

[1] https://lore.kernel.org/lkml/1550108893-21226-1-git-send-email-yamada.masahiro@socionext.com/

Fixes: 13610aa908dc ("kernel/configs: use .incbin directive to embed config_data.gz")
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
---
 scripts/gdb/linux/config.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/gdb/linux/config.py b/scripts/gdb/linux/config.py
index 90e1565b1967..8843ab3cbadd 100644
--- a/scripts/gdb/linux/config.py
+++ b/scripts/gdb/linux/config.py
@@ -24,9 +24,9 @@ class LxConfigDump(gdb.Command):
             filename = arg
 
         try:
-            py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
-            py_config_size = gdb.parse_and_eval(
-                    "sizeof(kernel_config_data) - 1 - 8 * 2")
+            py_config_ptr = gdb.parse_and_eval("&kernel_config_data")
+            py_config_ptr_end = gdb.parse_and_eval("&kernel_config_data_end")
+            py_config_size = py_config_ptr_end - py_config_ptr
         except gdb.error as e:
             raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
 
-- 
2.18.0