linux-kernel - Re: [PATCH 3/4] ptp_clock: allow for it to be optional

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Date:   Thu, 20 Oct 2016 13:47:29 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     John Stultz <john.stultz@...aro.org>,
        Richard Cochran <richardcochran@...il.com>,
        Yann E MORIN <yann.morin.1998@...e.fr>,
        Josh Triplett <josh@...htriplett.org>, netdev@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] ptp_clock: allow for it to be optional

On Thu, 20 Oct 2016, Thomas Gleixner wrote:

> On Wed, 19 Oct 2016, Nicolas Pitre wrote:
> > The pch_gbe driver is a bit special as it relies on extra code in
> > drivers/ptp/ptp_pch.c. Therefore we let the make process descend into
> > drivers/ptp/ even if PTP_1588_CLOCK is unselected.
> 
> The above paragraph looks like a leftover of the previous patch set.

Not really.  Without the change to drivers/Makefile, drivers/ptp/ is not 
visited when CONFIG_PTP_1588_CLOCK=n. If you then have CONFIG_PCH_GBE=y 
you end up with:

drivers/built-in.o: In function `pch_gbe_ioctl':
pch_gbe_main.c:(.text+0x28c914): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x28c945): undefined reference to `pch_set_station_address'
pch_gbe_main.c:(.text+0x28c964): undefined reference to `pch_ch_event_write'
pch_gbe_main.c:(.text+0x28c9ae): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x28c9c7): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x28c9e6): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x28ca17): undefined reference to `pch_set_station_address'
drivers/built-in.o: In function `pch_gbe_xmit_frame':
pch_gbe_main.c:(.text+0x28ceab): undefined reference to `pch_ch_event_read'
pch_gbe_main.c:(.text+0x28cebb): undefined reference to `pch_tx_snap_read'
pch_gbe_main.c:(.text+0x28ced8): undefined reference to `pch_ch_event_write'
drivers/built-in.o: In function `pch_gbe_napi_poll':
pch_gbe_main.c:(.text+0x28da6c): undefined reference to `pch_ch_event_read'
pch_gbe_main.c:(.text+0x28da78): undefined reference to `pch_src_uuid_lo_read'
pch_gbe_main.c:(.text+0x28da83): undefined reference to `pch_src_uuid_hi_read'
pch_gbe_main.c:(.text+0x28db0c): undefined reference to `pch_ch_event_write'
pch_gbe_main.c:(.text+0x28df69): undefined reference to `pch_rx_snap_read'
pch_gbe_main.c:(.text+0x28df88): undefined reference to `pch_ch_event_write'
make: *** [vmlinux] Error 1

Hence the above paragraph.


Nicolas