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

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Message-ID: <e5022460-fc45-5571-1f5b-2b81f7811a7d@linux.dev>
Date:   Fri, 22 Sep 2023 00:58:04 +0100
From:   Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        "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>
Cc:     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

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.

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