linux-kernel - Re: [PATCH] scripts/gdb: fix 'lx-lsmod' show the wrong size

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Message-ID: <aad3e8fb-d16b-3fab-f17b-3e6645c946cd@samsung.com>
Date:   Tue, 4 Jul 2023 14:11:45 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     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>,
        Luis Chamberlain <mcgrof@...nel.org>
CC:     <chinwen.chang@...iatek.com>, <qun-wei.lin@...iatek.com>,
        <linux-mm@...ck.org>, <andrew.yang@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] scripts/gdb: fix 'lx-lsmod' show the wrong size

> 'lsmod' shows total core layout size, so we need to
> sum up all the sections in core layout in gdb scripts.
> 
> / # lsmod
> kasan_test 200704 0 - Live 0xffff80007f640000
> 
> Before patch:
> (gdb) lx-lsmod
> Address            Module                  Size  Used by
> 0xffff80007f640000 kasan_test             36864  0
> 
> After patch:
> (gdb) lx-lsmod
> Address            Module                  Size  Used by
> 0xffff80007f640000 kasan_test            200704  0
> 
> Fixes: b4aff7513df3 ("scripts/gdb: use mem instead of core_layout to get the module address")
> Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
> ---

Just one minor comment, but apart from that, feel free to add:

Reviewed-by: Pankaj Raghav <p.raghav@...sung.com>

> diff --git a/scripts/gdb/linux/modules.py b/scripts/gdb/linux/modules.py
> index 261f28640f4c..84933c4c1083 100644
> --- a/scripts/gdb/linux/modules.py
> +++ b/scripts/gdb/linux/modules.py
> @@ -73,11 +73,17 @@ class LxLsmod(gdb.Command):
>                  "        " if utils.get_long_type().sizeof == 8 else ""))
>  
>          for module in module_list():
> -            layout = module['mem'][constants.LX_MOD_TEXT]
> +            total_size = 0
> +            for i in range(constants.LX_MOD_TEXT, constants.LX_MOD_RO_AFTER_INIT + 1):
> +                layout = module['mem'][i]
> +                if i == constants.LX_MOD_TEXT:
> +                    text_addr = str(layout['base']).split()[0]
> +                total_size += layout['size']
> +
>              gdb.write("{address} {name:<19} {size:>8}  {ref}".format(
> -                address=str(layout['base']).split()[0],
> +                address=text_addr,
>                  name=module['name'].string(),
> -                size=str(layout['size']),
> +                size=str(total_size),
>                  ref=str(module['refcnt']['counter'] - 1)))
>  
>              t = self._module_use_type.get_type().pointer()

We could slightly modify the code to remove the special condition with `i == constants.LX_MOD_TEXT`:

(I made changes on top of your patch)

diff --git a/scripts/gdb/linux/modules.py b/scripts/gdb/linux/modules.py
index 84933c4c1083..f76a43bfa15f 100644
--- a/scripts/gdb/linux/modules.py
+++ b/scripts/gdb/linux/modules.py
@@ -73,12 +73,12 @@ class LxLsmod(gdb.Command):
                 "        " if utils.get_long_type().sizeof == 8 else ""))

         for module in module_list():
+            text = module['mem'][constants.LX_MOD_TEXT]
+            text_addr = str(text['base']).split()[0]
             total_size = 0
+
             for i in range(constants.LX_MOD_TEXT, constants.LX_MOD_RO_AFTER_INIT + 1):
-                layout = module['mem'][i]
-                if i == constants.LX_MOD_TEXT:
-                    text_addr = str(layout['base']).split()[0]
-                total_size += layout['size']
+                total_size += module['mem'][i]['size']

             gdb.write("{address} {name:<19} {size:>8}  {ref}".format(
                 address=text_addr,