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Date: Mon, 27 Jun 2016 10:59:12 -0700
From: Stephen Hemminger <shemming@...cade.com>
To: Phil Sutter <phil@....cc>
CC: Daniel Borkmann <daniel@...earbox.net>,
David Ahern <dsa@...ulusnetworks.com>,
Nicolas Dichtel <nicolas.dichtel@...nd.com>,
Julien Floret <julien.floret@...nd.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [iproute PATCH v3 0/6] Big C99 style initializer rework
On Thu, 23 Jun 2016 17:34:08 +0000
Phil Sutter <phil@....cc> wrote:
> This is v3 of my C99-style initializer related patch series. The changes
> since v2 are:
>
> - Flattened embedded struct's initializers:
> Since the field names are very short, I figured it makes more sense to
> keep indenting low. Also, the same style is already used in
> ip/xfrm_policy.c so take that as an example.
>
> - Moved leftover nlmsg_seq initializing into the common place as well:
> I was unsure whether this is a good idea at first (due to the
> increment), but again it's done in ip/xfrm_policy.c as well so should
> be fine.
>
> - Added a comma after the last field initializer as suggested by Jakub.
>
> - Dropped patch 7 since it was NACKed.
>
> - Eliminated checkpatch non-compliance.
>
> - Second go at union bpf_attr in tc/tc_bpf.c:
> I figured that while it is not possible to initialize fields, gcc-3.4.6
> does not complain when setting the whole union to zero using '= {0}'.
> So I did this and thereby at least got rid of the memset calls.
>
> For reference, here's the v2 changelog:
>
> - Rebased onto current upstream master:
> My own commit a0a73b298a579 ("tc: m_action: Use C99 style initializers
> for struct req") contains most of the changes to tc/m_action.c already,
> so I put the remaining ones into a dedicated patch (the first one here)
> with a better description.
>
> - Tested against gcc-3.4.6:
> This is the oldest gcc version I was able to install locally. It indeed
> does not like the former changes in tc/tc_bpf.c, so I reverted them.
> Apart from emitting many warnings, it successfully compiles the
> sources.
>
> In the process of compatibility testing, I made a few more changes which
> make sense to have:
>
> - New patch 5 allows to conveniently override the compiler via command
> line.
>
> - New patch 6 eliminates a warning with old gcc but looks valid in
> general.
>
> - A warning made me look at ip/tcp_metrics.c and I found a minor code
> simplification (patch 7).
>
> Phil Sutter (6):
> tc: m_action: Improve conversion to C99 style initializers
> Use C99 style initializers everywhere
> Replace malloc && memset by calloc
> No need to initialize rtattr fields before parsing
> Makefile: Allow to override CC
> misc/ifstat: simplify unsigned value comparison
>
> Makefile | 4 +-
> bridge/fdb.c | 25 ++++++------
> bridge/link.c | 14 +++----
> bridge/mdb.c | 17 ++++-----
> bridge/vlan.c | 17 ++++-----
> genl/ctrl.c | 44 +++++++++------------
> genl/genl.c | 3 +-
> ip/ip6tunnel.c | 10 ++---
> ip/ipaddress.c | 33 +++++++---------
> ip/ipaddrlabel.c | 21 ++++------
> ip/iplink.c | 61 ++++++++++++-----------------
> ip/iplink_can.c | 4 +-
> ip/ipmaddr.c | 25 ++++--------
> ip/ipmroute.c | 8 +---
> ip/ipneigh.c | 30 ++++++---------
> ip/ipnetconf.c | 10 ++---
> ip/ipnetns.c | 39 +++++++++----------
> ip/ipntable.c | 25 ++++--------
> ip/iproute.c | 78 +++++++++++++------------------------
> ip/iprule.c | 22 +++++------
> ip/iptoken.c | 19 ++++-----
> ip/iptunnel.c | 31 +++++----------
> ip/ipxfrm.c | 26 ++++---------
> ip/link_gre.c | 18 ++++-----
> ip/link_gre6.c | 18 ++++-----
> ip/link_ip6tnl.c | 25 +++++-------
> ip/link_iptnl.c | 22 +++++------
> ip/link_vti.c | 18 ++++-----
> ip/link_vti6.c | 18 ++++-----
> ip/xfrm_policy.c | 99 +++++++++++++++++++----------------------------
> ip/xfrm_state.c | 110 ++++++++++++++++++++++-------------------------------
> lib/libnetlink.c | 77 ++++++++++++++-----------------------
> lib/ll_map.c | 1 -
> lib/names.c | 7 +---
> misc/arpd.c | 64 ++++++++++++++-----------------
> misc/ifstat.c | 2 +-
> misc/lnstat.c | 6 +--
> misc/lnstat_util.c | 4 +-
> misc/ss.c | 37 +++++++-----------
> tc/e_bpf.c | 7 +---
> tc/em_canid.c | 4 +-
> tc/em_cmp.c | 4 +-
> tc/em_ipset.c | 4 +-
> tc/em_meta.c | 4 +-
> tc/em_nbyte.c | 4 +-
> tc/em_u32.c | 4 +-
> tc/f_flow.c | 3 --
> tc/f_flower.c | 3 +-
> tc/f_fw.c | 6 +--
> tc/f_route.c | 3 --
> tc/f_rsvp.c | 6 +--
> tc/f_u32.c | 12 ++----
> tc/m_action.c | 26 ++++---------
> tc/m_bpf.c | 5 +--
> tc/m_csum.c | 4 +-
> tc/m_ematch.c | 4 +-
> tc/m_gact.c | 5 +--
> tc/m_ife.c | 5 +--
> tc/m_ipt.c | 13 ++-----
> tc/m_mirred.c | 7 +---
> tc/m_nat.c | 4 +-
> tc/m_pedit.c | 11 ++----
> tc/m_police.c | 5 +--
> tc/q_atm.c | 3 +-
> tc/q_cbq.c | 22 +++--------
> tc/q_choke.c | 4 +-
> tc/q_codel.c | 3 +-
> tc/q_dsmark.c | 1 -
> tc/q_fifo.c | 4 +-
> tc/q_fq_codel.c | 3 +-
> tc/q_hfsc.c | 13 ++-----
> tc/q_htb.c | 15 +++-----
> tc/q_netem.c | 16 +++-----
> tc/q_red.c | 4 +-
> tc/q_sfb.c | 17 ++++-----
> tc/q_sfq.c | 4 +-
> tc/q_tbf.c | 4 +-
> tc/tc.c | 9 ++---
> tc/tc_bpf.c | 58 ++++++++++------------------
> tc/tc_class.c | 38 +++++++-----------
> tc/tc_exec.c | 6 +--
> tc/tc_filter.c | 33 ++++++----------
> tc/tc_qdisc.c | 33 ++++++----------
> tc/tc_stab.c | 4 +-
> tc/tc_util.c | 3 +-
> 85 files changed, 565 insertions(+), 977 deletions(-)
I like the idea and it makes code cleaner. But doing this introduces lots of warnings
and that is not acceptable.
ip
CC ip.o
CC ipaddress.o
ipaddress.c: In function ‘print_queuelen’:
ipaddress.c:175:10: warning: missing braces around initializer [-Wmissing-braces]
struct ifreq ifr = { 0 };
^
ipaddress.c:175:10: warning: (near initialization for ‘ifr.ifr_ifrn’) [-Wmissing-braces]
CC ipaddrlabel.o
CC iproute.o
CC iprule.o
CC ipnetns.o
CC rtm_map.o
CC iptunnel.o
iptunnel.c: In function ‘parse_args’:
iptunnel.c:183:12: warning: missing braces around initializer [-Wmissing-braces]
struct ip_tunnel_parm old_p = { 0 };
^
iptunnel.c:183:12: warning: (near initialization for ‘old_p.name’) [-Wmissing-braces]
iptunnel.c: In function ‘print_tunnel’:
iptunnel.c:296:9: warning: missing braces around initializer [-Wmissing-braces]
struct ip_tunnel_6rd ip6rd = { 0 };
^
iptunnel.c:296:9: warning: (near initialization for ‘ip6rd.prefix’) [-Wmissing-braces]
iptunnel.c:310:10: warning: missing braces around initializer [-Wmissing-braces]
struct ip_tunnel_prl prl[16] = { 0 };
^
iptunnel.c:310:10: warning: (near initialization for ‘prl[0]’) [-Wmissing-braces]
iptunnel.c: In function ‘do_tunnels_list’:
iptunnel.c:402:10: warning: missing braces around initializer [-Wmissing-braces]
struct ip_tunnel_parm p1 = { 0 };
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