linux-kernel - Re: [PATCH v2] net: codel: fix build errors

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Message-ID: <CA+1xoqe6=nu0nvGVa_Hei+XVfRE0QaAtTa+n=ZQc22mj3Xm8Rg@mail.gmail.com>
Date:	Tue, 15 May 2012 00:09:49 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	edumazet@...gle.com, dave.taht@...ferbloat.net,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: codel: fix build errors

On Tue, May 15, 2012 at 12:05 AM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Mon, 14 May 2012 23:57:06 +0200
> Sasha Levin <levinsasha928@...il.com> wrote:
>
>> Fix the following build error:
>>
>> net/sched/sch_fq_codel.c: In function 'fq_codel_dump_stats':
>> net/sched/sch_fq_codel.c:464:3: error: unknown field 'qdisc_stats' specified in initializer
>> net/sched/sch_fq_codel.c:464:3: warning: missing braces around initializer
>> net/sched/sch_fq_codel.c:464:3: warning: (near initialization for 'st.<anonymous>')
>> net/sched/sch_fq_codel.c:465:3: error: unknown field 'qdisc_stats' specified in initializer
>> net/sched/sch_fq_codel.c:465:3: warning: excess elements in struct initializer
>> net/sched/sch_fq_codel.c:465:3: warning: (near initialization for 'st')
>> net/sched/sch_fq_codel.c:466:3: error: unknown field 'qdisc_stats' specified in initializer
>> net/sched/sch_fq_codel.c:466:3: warning: excess elements in struct initializer
>> net/sched/sch_fq_codel.c:466:3: warning: (near initialization for 'st')
>> net/sched/sch_fq_codel.c:467:3: error: unknown field 'qdisc_stats' specified in initializer
>> net/sched/sch_fq_codel.c:467:3: warning: excess elements in struct initializer
>> net/sched/sch_fq_codel.c:467:3: warning: (near initialization for 'st')
>> make[1]: *** [net/sched/sch_fq_codel.o] Error 1
>>
>> Signed-off-by: Sasha Levin <levinsasha928@...il.com>
>> ---
>>  net/sched/sch_fq_codel.c |    9 +++++----
>>  1 files changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
>> index a7b3754..337ff20 100644
>> --- a/net/sched/sch_fq_codel.c
>> +++ b/net/sched/sch_fq_codel.c
>> @@ -461,13 +461,14 @@ static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
>>       struct fq_codel_sched_data *q = qdisc_priv(sch);
>>       struct tc_fq_codel_xstats st = {
>>               .type                           = TCA_FQ_CODEL_XSTATS_QDISC,
>> -             .qdisc_stats.maxpacket          = q->cstats.maxpacket,
>> -             .qdisc_stats.drop_overlimit     = q->drop_overlimit,
>> -             .qdisc_stats.ecn_mark           = q->cstats.ecn_mark,
>> -             .qdisc_stats.new_flow_count     = q->new_flow_count,
>>       };
>>       struct list_head *pos;
>>
>> +     st.qdisc_stats.maxpacket = q->cstats.maxpacket;
>> +     st.qdisc_stats.drop_overlimit = q->drop_overlimit;
>> +     st.qdisc_stats.ecn_mark = q->cstats.ecn_mark;
>> +     st.qdisc_stats.new_flow_count = q->new_flow_count;
>> +
>>       list_for_each(pos, &q->new_flows)
>>               st.qdisc_stats.new_flows_len++;
>>
>
> Cleaner and simpler to just use nested initialization.
>        struct tc_fq_codel_xstats st = {
>                .type                           = TCA_FQ_CODEL_XSTATS_QDISC,
>                .qdisc_stats = {
>                        .maxpacket      = q->cstats.maxpacket,
>                        .drop_overlimit = q->drop_overlimit,
>                        .ecn_mark       = q->cstats.ecn_mark,
>                        .new_flow_count = q->new_flow_count,
>                },
>        };

You'll get the same errors. You can't directly initialize members that
are in an anonymous union.
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