linux-kernel - Re: [PATCH v2] net: introduce helper macro for_each

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Message-Id: <20141210.144430.1749715282635917425.davem@davemloft.net>
Date:	Wed, 10 Dec 2014 14:44:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	guz.fnst@...fujitsu.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	joe@...ches.com
Subject: Re: [PATCH v2] net: introduce helper macro for_each_cmsghdr

From: David Miller <davem@...emloft.net>
Date: Wed, 10 Dec 2014 13:48:04 -0500 (EST)

> From: Gu Zheng <guz.fnst@...fujitsu.com>
> Date: Wed, 10 Dec 2014 13:36:25 +0800
> 
>> Introduce helper macro for_each_cmsghdr as a wrapper of the enumerating
>> cmsghdr from msghdr, just cleanup. 
>> 
>> Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>
> 
> Applied, thanks.

This breaks the build, I'm reverting.

You cannot use your new macros in
Documentation/networking/timestamping/txtimestamp.c, that is a
userland program and the header you are adding your helper to is not
available to userspace.

This also means you didn't sufficiently test the build of your
changes.

Documentation/networking/timestamping/timestamping.c: In function ‘printpacket’:
Documentation/networking/timestamping/timestamping.c:172:2: warning: implicit declaration of function ‘for_each_cmsghdr’ [-Wimplicit-function-declaration]
Documentation/networking/timestamping/timestamping.c:172:30: error: expected ‘;’ before ‘{’ token
Documentation/networking/timestamping/timestamping.c:161:18: warning: unused variable ‘ts’ [-Wunused-variable]
Documentation/networking/timestamping/timestamping.c:160:17: warning: unused variable ‘tv’ [-Wunused-variable]
make[3]: *** [Documentation/networking/timestamping/timestamping] Error 1
make[3]: *** Waiting for unfinished jobs....
Documentation/networking/timestamping/txtimestamp.c: In function ‘__recv_errmsg_cmsg’:
Documentation/networking/timestamping/txtimestamp.c:187:2: warning: implicit declaration of function ‘for_each_cmsghdr’ [-Wimplicit-function-declaration]
Documentation/networking/timestamping/txtimestamp.c:187:19: error: ‘cmsg’ undeclared (first use in this function)
Documentation/networking/timestamping/txtimestamp.c:187:19: note: each undeclared identifier is reported only once for each function it appears in
Documentation/networking/timestamping/txtimestamp.c:187:30: error: expected ‘;’ before ‘{’ token
Documentation/networking/timestamping/txtimestamp.c:185:18: warning: unused variable ‘cm’ [-Wunused-variable]
Documentation/networking/timestamping/txtimestamp.c:184:27: warning: unused variable ‘tss’ [-Wunused-variable]
Documentation/networking/timestamping/txtimestamp.c:183:28: warning: unused variable ‘serr’ [-Wunused-variable]
Documentation/networking/timestamping/txtimestamp.c: At top level:
Documentation/networking/timestamping/txtimestamp.c:123:13: warning: ‘print_timestamp’ defined but not used [-Wunused-function]
Documentation/networking/timestamping/txtimestamp.c:159:13: warning: ‘print_pktinfo’ defined but not used [-Wunused-function]