linux-kernel - Re: [PATCH] net: bcmgenet: Initialize u64 stats seq counter

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Message-Id: <20250701090858.7954-1-ryotkkr98@gmail.com>
Date: Tue,  1 Jul 2025 18:08:58 +0900
From: Ryo Takakura <ryotkkr98@...il.com>
To: horms@...nel.org
Cc: andrew+netdev@...n.ch,
	bcm-kernel-feedback-list@...adcom.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	florian.fainelli@...adcom.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	opendmb@...il.com,
	pabeni@...hat.com,
	ryotkkr98@...il.com,
	zakkemble@...il.com
Subject: Re: [PATCH] net: bcmgenet: Initialize u64 stats seq counter

Hello Horman-san!

On Mon, 30 Jun 2025 17:21:47 +0100, Simon Horman wrote:
>On Sun, Jun 29, 2025 at 11:41:09AM +0000, Ryo Takakura wrote:
>> Initialize u64 stats as it uses seq counter on 32bit machines
>> as suggested by lockdep below.
>> 
>> [    1.830953][    T1] INFO: trying to register non-static key.
>> [    1.830993][    T1] The code is fine but needs lockdep annotation, or maybe
>> [    1.831027][    T1] you didn't initialize this object before use?
>> [    1.831057][    T1] turning off the locking correctness validator.
>> [    1.831090][    T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Tainted: G        W           6.16.0-rc2-v7l+ #1 PREEMPT
>> [    1.831097][    T1] Tainted: [W]=WARN
>> [    1.831099][    T1] Hardware name: BCM2711
>> [    1.831101][    T1] Call trace:
>> [    1.831104][    T1]  unwind_backtrace from show_stack+0x18/0x1c
>> [    1.831120][    T1]  show_stack from dump_stack_lvl+0x8c/0xcc
>> [    1.831129][    T1]  dump_stack_lvl from register_lock_class+0x9e8/0x9fc
>> [    1.831141][    T1]  register_lock_class from __lock_acquire+0x420/0x22c0
>> [    1.831154][    T1]  __lock_acquire from lock_acquire+0x130/0x3f8
>> [    1.831166][    T1]  lock_acquire from bcmgenet_get_stats64+0x4a4/0x4c8
>> [    1.831176][    T1]  bcmgenet_get_stats64 from dev_get_stats+0x4c/0x408
>> [    1.831184][    T1]  dev_get_stats from rtnl_fill_stats+0x38/0x120
>> [    1.831193][    T1]  rtnl_fill_stats from rtnl_fill_ifinfo+0x7f8/0x1890
>> [    1.831203][    T1]  rtnl_fill_ifinfo from rtmsg_ifinfo_build_skb+0xd0/0x138
>> [    1.831214][    T1]  rtmsg_ifinfo_build_skb from rtmsg_ifinfo+0x48/0x8c
>> [    1.831225][    T1]  rtmsg_ifinfo from register_netdevice+0x8c0/0x95c
>> [    1.831237][    T1]  register_netdevice from register_netdev+0x28/0x40
>> [    1.831247][    T1]  register_netdev from bcmgenet_probe+0x690/0x6bc
>> [    1.831255][    T1]  bcmgenet_probe from platform_probe+0x64/0xbc
>> [    1.831263][    T1]  platform_probe from really_probe+0xd0/0x2d4
>> [    1.831269][    T1]  really_probe from __driver_probe_device+0x90/0x1a4
>> [    1.831273][    T1]  __driver_probe_device from driver_probe_device+0x38/0x11c
>> [    1.831278][    T1]  driver_probe_device from __driver_attach+0x9c/0x18c
>> [    1.831282][    T1]  __driver_attach from bus_for_each_dev+0x84/0xd4
>> [    1.831291][    T1]  bus_for_each_dev from bus_add_driver+0xd4/0x1f4
>> [    1.831303][    T1]  bus_add_driver from driver_register+0x88/0x120
>> [    1.831312][    T1]  driver_register from do_one_initcall+0x78/0x360
>> [    1.831320][    T1]  do_one_initcall from kernel_init_freeable+0x2bc/0x314
>> [    1.831331][    T1]  kernel_init_freeable from kernel_init+0x1c/0x144
>> [    1.831339][    T1]  kernel_init from ret_from_fork+0x14/0x20
>> [    1.831344][    T1] Exception stack(0xf082dfb0 to 0xf082dff8)
>> [    1.831349][    T1] dfa0:                                     00000000 00000000 00000000 00000000
>> [    1.831353][    T1] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> [    1.831356][    T1] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
>> 
>> Fixes: 59aa6e3072aa ("net: bcmgenet: switch to use 64bit statistics")
>> Signed-off-by: Ryo Takakura <ryotkkr98@...il.com>
>
>Hi Takakura-san,
>
>Thanks for your patch.
>
>Unfortunately it doesn't apply cleanly which is needed by our CI to process
>your patch.
>
>Please:
>
>* Rebase and repost your patch on the net tree
>
>* Target your patch at net (as opposed to net-next) like this
>
>	Subject: [PATCH net v2] ...
>
>* And include Florian's tag in v2
>
>* Post v2 as a new thread
>
>For more information please see
>https://docs.kernel.org/process/maintainer-netdev.html

Thank you for elaborating.
I'll resend v2 accordingly!

Sincerely,
Ryo Takakura