linux-kernel - Re: [PATCH v2 1/8] scripts/gdb/symbols: add specific ko module load command

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Message-Id: <20230912092349.2ec5bf4e20bed10d27410076@linux-foundation.org>
Date:   Tue, 12 Sep 2023 09:23:49 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        chinwen.chang@...iatek.com, qun-wei.lin@...iatek.com,
        linux-mm@...ck.org, linux-modules@...r.kernel.org,
        casper.li@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/8] scripts/gdb/symbols: add specific ko module load
 command

On Tue, 12 Sep 2023 11:41:29 +0200 Johannes Berg <johannes@...solutions.net> wrote:

> On Tue, 2023-08-08 at 16:30 +0800, Kuan-Ying Lee wrote:
> > Add lx-symbols <ko_path> command to support add specific
> > ko module.
> 
> I'm not sure how this was supposed to work? It should have updated the
> documentation, but more importantly, it shouldn't have broken the
> documented usage of this command:
> 
>       The kernel (vmlinux) is taken from the current working directly. Modules (.ko)
>       are scanned recursively, starting in the same directory. Optionally, the module
>       search path can be extended by a space separated list of paths passed to the
>       lx-symbols command.
> 
> Note how that talks about a "space separated list of paths" for which
> clearly a single path seems like it should be accepted?
> 
> > @@ -138,6 +139,19 @@ lx-symbols command."""

Thanks, I queued a revert.

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: revert "scripts/gdb/symbols: add specific ko module load command"
Date: Tue Sep 12 09:19:10 AM PDT 2023

Revert 11f956538c07 ("scripts/gdb/symbols: add specific ko module load
command") due to breakage identified by Johannes Berg in [1].

Fixes: 11f956538c07 ("scripts/gdb/symbols: add specific ko module load command")
Reported-by: Johannes Berg <johannes@...solutions.net>
Closes: https://lkml.kernel.org/r/c44b748307a074d0c250002cdcfe209b8cce93c9.camel@sipsolutions.net [1]
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chinwen Chang <chinwen.chang@...iatek.com>
Cc: Jan Kiszka <jan.kiszka@...mens.com>
Cc: Kieran Bingham <kbingham@...nel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: Qun-Wei Lin <qun-wei.lin@...iatek.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 scripts/gdb/linux/symbols.py |   23 ++---------------------
 1 file changed, 2 insertions(+), 21 deletions(-)

--- a/scripts/gdb/linux/symbols.py~revert-scripts-gdb-symbols-add-specific-ko-module-load-command
+++ a/scripts/gdb/linux/symbols.py
@@ -111,12 +111,11 @@ lx-symbols command."""
         return "{textaddr} {sections}".format(
             textaddr=textaddr, sections="".join(args))
 
-    def load_module_symbols(self, module, module_file=None):
+    def load_module_symbols(self, module):
         module_name = module['name'].string()
         module_addr = str(module['mem'][constants.LX_MOD_TEXT]['base']).split()[0]
 
-        if not module_file:
-            module_file = self._get_module_file(module_name)
+        module_file = self._get_module_file(module_name)
         if not module_file and not self.module_files_updated:
             self._update_module_files()
             module_file = self._get_module_file(module_name)
@@ -139,19 +138,6 @@ lx-symbols command."""
         else:
             gdb.write("no module object found for '{0}'\n".format(module_name))
 
-    def load_ko_symbols(self, mod_path):
-        self.loaded_modules = []
-        module_list = modules.module_list()
-
-        for module in module_list:
-            module_name = module['name'].string()
-            module_pattern = ".*/{0}\.ko(?:.debug)?$".format(
-                module_name.replace("_", r"[_\-]"))
-            if re.match(module_pattern, mod_path) and os.path.exists(mod_path):
-                self.load_module_symbols(module, mod_path)
-                return
-        raise gdb.GdbError("%s is not a valid .ko\n" % mod_path)
-
     def load_all_symbols(self):
         gdb.write("loading vmlinux\n")
 
@@ -190,11 +176,6 @@ lx-symbols command."""
         self.module_files = []
         self.module_files_updated = False
 
-        argv = gdb.string_to_argv(arg)
-        if len(argv) == 1:
-            self.load_ko_symbols(argv[0])
-            return
-
         self.load_all_symbols()
 
         if hasattr(gdb, 'Breakpoint'):
_