[PATCH 6.2 487/663] scripts/gdb: raise error with reduced debugging information

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Florian Fainelli <f.fainelli@xxxxxxxxx>

[ Upstream commit 8af055ae25bff48f57227f5e3d48a4306f3dd1c4 ]

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.

Link: https://lkml.kernel.org/r/20230406215252.1580538-1-f.fainelli@xxxxxxxxx
Fixes: e3c8d33e0d62 ("scripts/gdb: fix 'lx-dmesg' on 32 bits arch")
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Antonio Borneo <antonio.borneo@xxxxxxxxxxx>
Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: John Ogness <john.ogness@xxxxxxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 2efbec6b6b8db..08f0587d15ea1 100644
--- a/scripts/gdb/linux/constants.py.in
+++ b/scripts/gdb/linux/constants.py.in
@@ -39,6 +39,8 @@
 
 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 3e8d3669f0ce0..5564ffe8ae327 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
-- 
2.39.2