linux-kernel - [PATCH] scripts/gdb: Raise error with reduced debugging information

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Date:   Thu,  6 Apr 2023 14:52:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     kapil.hali@...adcom.com, akpm@...uxfoundation.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>,
        Antonio Borneo <antonio.borneo@...s.st.com>
Subject: [PATCH] scripts/gdb: Raise error with reduced debugging information

If CONFIG_DEBUG_INFO_REDUCED is enabled in the kernel configuration, we
will typically not be able to load vmlinux-gdb.py and will fail with:

Traceback (most recent call last):
  File "/home/fainelli/work/buildroot/output/arm64/build/linux-custom/vmlinux-gdb.py", line 25, in <module>
    import linux.utils
  File "/home/fainelli/work/buildroot/output/arm64/build/linux-custom/scripts/gdb/linux/utils.py", line 131, in <module>
    atomic_long_counter_offset = atomic_long_type.get_type()['counter'].bitpos
KeyError: 'counter'

Rather be left wondering what is happening only to find out that reduced debug
information is the cause, raise an eror. This was not typically a
problem until e3c8d33e0d62 ("scripts/gdb: fix 'lx-dmesg' on 32 bits
arch") but it has since then.

Fixes: e3c8d33e0d62 ("scripts/gdb: fix 'lx-dmesg' on 32 bits arch")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Hi all,

I added the Fixes tag because it really was not a problem before,
however it now is an issue and the commit in the Fixes: tag has been
backported to stable already

 scripts/gdb/linux/constants.py.in | 2 ++
 scripts/gdb/vmlinux-gdb.py        | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in
index c5e6de285b57..36fd2b145853 100644
--- a/scripts/gdb/linux/constants.py.in
+++ b/scripts/gdb/linux/constants.py.in
@@ -41,6 +41,8 @@
 
 import gdb
 
+LX_CONFIG(CONFIG_DEBUG_INFO_REDUCED)
+
 /* linux/clk-provider.h */
 if IS_BUILTIN(CONFIG_COMMON_CLK):
     LX_GDBPARSED(CLK_GET_RATE_NOCACHE)
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index 4e74d6d4fa09..2a72f91059b5 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/scripts/gdb/vmlinux-gdb.py
@@ -22,6 +22,10 @@ except:
     gdb.write("NOTE: gdb 7.2 or later required for Linux helper scripts to "
               "work.\n")
 else:
+    import linux.constants
+    if linux.constants.LX_CONFIG_DEBUG_INFO_REDUCED:
+        raise gdb.GdbError("Reduced debug information will prevent GDB "
+                           "from having complete types.\n")
     import linux.utils
     import linux.symbols
     import linux.modules
@@ -32,7 +36,6 @@ else:
     import linux.lists
     import linux.rbtree
     import linux.proc
-    import linux.constants
     import linux.timerlist
     import linux.clk
     import linux.genpd
-- 
2.34.1