netdev - Re: [PATCH net-next 2/3] ice: fix undefined references from DPLL code when !CONFIG_PTP_1588

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Date: Fri, 22 Sep 2023 15:58:43 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Jacob Keller <jacob.e.keller@...el.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, Richard Cochran <richardcochran@...il.com>,
	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>, Michal Michalik
	<michal.michalik@...el.com>, Milena Olech <milena.olech@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH net-next 2/3] ice: fix undefined references from DPLL code
 when !CONFIG_PTP_1588_CLOCK

From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Date: Fri, 22 Sep 2023 00:58:04 +0100

> On 20/09/2023 19:07, Alexander Lobakin wrote:
>> DPLL code in ice unconditionally calls several PTP functions which are
>> only built when CONFIG_PTP_1588_CLOCK is set. This throws a good bunch
>> of link errors:
>>
>> ERROR: modpost: "ice_cgu_get_pin_name"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>> ERROR: modpost: "ice_get_cgu_state"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>> OR: modpost: "ice_is_cgu_present"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>> ERROR: modpost: "ice_get_cgu_rclk_pin_info"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>> ERROR: modpost: "ice_cgu_get_pin_type"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>> ERROR: modpost: "ice_cgu_get_pin_freq_supp"
>> [drivers/net/ethernet/intel/ice/ice.ko] undefined!
>>
>> ice_dpll_{,de}init() can be only called at runtime when the
>> corresponding feature flags are set, which is not the case when PTP
>> support is not compiled. However, the linker has no clue about this.
>> Compile DPLL code only when CONFIG_PTP_1588_CLOCK is enabled and guard
>> the mentioned init/deinit function calls, so that ice_dpll.o is only
>> referred when it gets compiled.
>>
>> Note that ideally ice_is_feature_supported() needs to check for
>> compile-time flags first to be able to handle this without any
>> additional call guards, and we may want to do that in the future.
>>
> 
> There is another fix under review [1], which came from Jacob.
> It converts the code a bit more, and will create conflicts.
> I would suggest to drop this patch until another series is fully
> reviewed.

I know, I already explained earlier in this topic that I sent the IDPF
fix separately and that series can be dropped.

> 
> [1]
> https://lore.kernel.org/netdev/20230921000633.1238097-1-jacob.e.keller@intel.com/

Thanks,
Olek