netdev - Re: [PATCH v2 net-next] net: ptp: oki-semi: fix build dependency

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Date:	Mon, 31 Mar 2014 13:19:36 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next] net: ptp: oki-semi: fix build dependency

On Mon, Mar 31, 2014 at 11:55 AM, Richard Cochran
<richardcochran@...il.com> wrote:
> On Mon, Mar 31, 2014 at 11:02:21AM -0700, Alexei Starovoitov wrote:
>
>> Richard,
>> thank you for suggestion.
>> oki-semi depends on ptp, so it's cleaner to move ptp_classify_raw there,
>> instead of making it unconditionally available in net/core
>
>> Daniel,
>> timestamping has its own copy of PTP_FILTER, since timestamping
>> doesn't depend on ptp and I didn't want to add circular dependency,
>> since some of ptp pieces depend on timestamping, but not the others
>
> We don't really need two copies. As long as you are refactoring this,
> why not reduce it to just one filter?
>
> Something like
>
> #if defined(CONFIG_PTP_1588_CLOCK) || defined(CONFIG_NETWORK_PHY_TIMESTAMPING)
>
> ... code here ...
>
> #endif
>
> could go into filter.c or somewhere else in the stack.

Agree. two copies are not elegant, but #ifdef like above in filter.c
is even less elegant.
May be do net/core/Makefile:
-obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += timestamping.o
+obj-y += timestamping.o
and add above #ifdefs to exclude most of the timestamping.c?
Any other options?
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