linux-kernel - Re: [PATCH net v4] net: ethernet: ti: Remove TI_CPTS

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Date:   Tue, 12 May 2020 12:08:53 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Networking <netdev@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Clay McClure <clay@...mons.net>, Dan Murphy <dmurphy@...com>
Subject: Re: [PATCH net v4] net: ethernet: ti: Remove TI_CPTS_MOD workaround

On Tue, May 12, 2020 at 12:02 PM Grygorii Strashko
<grygorii.strashko@...com> wrote:
>
> From: Clay McClure <clay@...mons.net>
>
> My recent commit b6d49cab44b5 ("net: Make PTP-specific drivers depend on
> PTP_1588_CLOCK") exposes a missing dependency in defconfigs that select
> TI_CPTS without selecting PTP_1588_CLOCK, leading to linker errors of the
> form:
>
> drivers/net/ethernet/ti/cpsw.o: in function `cpsw_ndo_stop':
> cpsw.c:(.text+0x680): undefined reference to `cpts_unregister'
>  ...
>
> That's because TI_CPTS_MOD (which is the symbol gating the _compilation_ of
> cpts.c) now depends on PTP_1588_CLOCK, and so is not enabled in these
> configurations, but TI_CPTS (which is the symbol gating _calls_ to the cpts
> functions) _is_ enabled. So we end up compiling calls to functions that
> don't exist, resulting in the linker errors.
>
> This patch fixes build errors and restores previous behavior by:
>  - ensure PTP_1588_CLOCK=y in TI specific configs and CPTS will be built
>  - remove TI_CPTS_MOD and, instead, add dependencies from CPTS in
>    TI_CPSW/TI_KEYSTONE_NETCP/TI_CPSW_SWITCHDEV as below:
>
>    config TI_CPSW_SWITCHDEV
>    ...
>     depends on TI_CPTS || !TI_CPTS
>
>    which will ensure proper dependencies PTP_1588_CLOCK -> TI_CPTS ->
> TI_CPSW/TI_KEYSTONE_NETCP/TI_CPSW_SWITCHDEV and build type selection.
>
> Note. For NFS boot + CPTS all of above configs have to be built-in.
>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Dan Murphy <dmurphy@...com>
> Cc: Tony Lindgren <tony@...mide.com>
> Fixes: b6d49cab44b5 ("net: Make PTP-specific drivers depend on PTP_1588_CLOCK")
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Clay McClure <clay@...mons.net>
> [grygorii.strashko@...com: rewording, add deps cpsw/netcp from cpts, drop IS_REACHABLE]
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Reviewed-by: Arnd Bergmann <arnd@...db.de>