linux-kernel - [PATCH 2/4] scripts/gdb: Fix parameter handling in $lx_per

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Date: Thu, 25 Apr 2024 17:34:59 +0200
From: Florian Rommel <mail@...rommel.de>
To: Jan Kiszka <jan.kiszka@...mens.com>,
	Kieran Bingham <kbingham@...nel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Deepak Gupta <debug@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Florian Rommel <mail@...rommel.de>
Subject: [PATCH 2/4] scripts/gdb: Fix parameter handling in $lx_per_cpu

Before, the script tried to get the address by constructing a pointer to
the parameter (by name).  However, since GDB now passes the parameter as a
GdbValue, we cannot get its name.  Instead, we retrieve the address through
GdbValue's address attribute.

Before:
>>> p $lx_per_cpu(cpu_info)
Traceback (most recent call last):
  File "./scripts/gdb/linux/cpus.py", line 152, in invoke
    var_ptr = gdb.parse_and_eval("&" + var_name.string())
                                       ^^^^^^^^^^^^^^^^^
gdb.error: Trying to read string with inappropriate type `struct cpuinfo_x86'.

Signed-off-by: Florian Rommel <mail@...rommel.de>
---
 scripts/gdb/linux/cpus.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index cba589e5b57d..2b51a3abd363 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -152,9 +152,8 @@ Note that VAR has to be quoted as string."""
     def __init__(self):
         super(PerCpu, self).__init__("lx_per_cpu")
 
-    def invoke(self, var_name, cpu=-1):
-        var_ptr = gdb.parse_and_eval("&" + var_name.string())
-        return per_cpu(var_ptr, cpu)
+    def invoke(self, var, cpu=-1):
+        return per_cpu(var.address, cpu)
 
 
 PerCpu()
-- 
2.44.0