linux-kernel - Re: [PATCH] tests/module/gen_test_kallsyms.sh: use 0 value for variables

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Message-ID: <CABCJKueDJuAz30=Wat5D1-V9eYzAbP7wAY61Fgzw_KZJcHWiSw@mail.gmail.com>
Date: Wed, 6 Nov 2024 18:46:48 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org, 
	petr.pavlu@...e.com, da.gomez@...sung.com, masahiroy@...nel.org, 
	deller@....de, linux-arch@...r.kernel.org, live-patching@...r.kernel.org, 
	kris.van.hees@...cle.com
Subject: Re: [PATCH] tests/module/gen_test_kallsyms.sh: use 0 value for variables

Hi Luis,

On Wed, Nov 6, 2024 at 12:24 AM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> Use 0 for the values as we use them for the return value on init
> to keep the test modules simple. This fixes a splat reported
>
> do_init_module: 'test_kallsyms_b'->init suspiciously returned 255, it should follow 0/-E convention
> do_init_module: loading module anyway...
> CPU: 5 UID: 0 PID: 1873 Comm: modprobe Not tainted 6.12.0-rc3+ #4
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2024.08-1 09/18/2024
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x56/0x80
>  do_init_module.cold+0x21/0x26
>  init_module_from_file+0x88/0xf0
>  idempotent_init_module+0x108/0x300
>  __x64_sys_finit_module+0x5a/0xb0
>  do_syscall_64+0x4b/0x110
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> RIP: 0033:0x7f4f3a718839
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff>
> RSP: 002b:00007fff97d1a9e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> RAX: ffffffffffffffda RBX: 000055b94001ab90 RCX: 00007f4f3a718839
> RDX: 0000000000000000 RSI: 000055b910e68a10 RDI: 0000000000000004
> RBP: 0000000000000000 R08: 00007f4f3a7f1b20 R09: 000055b94001c5b0
> R10: 0000000000000040 R11: 0000000000000246 R12: 000055b910e68a10
> R13: 0000000000040000 R14: 000055b94001ad60 R15: 0000000000000000
>  </TASK>
> do_init_module: 'test_kallsyms_b'->init suspiciously returned 255, it should follow 0/-E convention
> do_init_module: loading module anyway...
> CPU: 1 UID: 0 PID: 1884 Comm: modprobe Not tainted 6.12.0-rc3+ #4
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2024.08-1 09/18/2024
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x56/0x80
>  do_init_module.cold+0x21/0x26
>  init_module_from_file+0x88/0xf0
>  idempotent_init_module+0x108/0x300
>  __x64_sys_finit_module+0x5a/0xb0
>  do_syscall_64+0x4b/0x110
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> RIP: 0033:0x7ffaa5d18839
>
> Reported-by: Sami Tolvanen <samitolvanen@...gle.com>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  lib/tests/module/gen_test_kallsyms.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/tests/module/gen_test_kallsyms.sh b/lib/tests/module/gen_test_kallsyms.sh
> index ae5966f1f904..3f2c626350ad 100755
> --- a/lib/tests/module/gen_test_kallsyms.sh
> +++ b/lib/tests/module/gen_test_kallsyms.sh
> @@ -32,7 +32,7 @@ gen_num_syms()
>         PREFIX=$1
>         NUM=$2
>         for i in $(seq 1 $NUM); do
> -               printf "int auto_test_%s_%010d = 0xff;\n" $PREFIX $i
> +               printf "int auto_test_%s_%010d = 0;\n" $PREFIX $i
>                 printf "EXPORT_SYMBOL_GPL(auto_test_%s_%010d);\n" $PREFIX $i
>         done
>         echo

Looks good to me. Thanks!

Reviewed-by: Sami Tolvanen <samitolvanen@...gle.com>

Sami