netdev - Re: [PATCH net-next v3] net/smc: fix compile warning for smc

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Date:   Mon, 7 Mar 2022 10:59:21 +0800
From:   "dust.li" <dust.li@...ux.alibaba.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Tony Lu <tonylu@...ux.alibaba.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next v3] net/smc: fix compile warning for smc_sysctl

On Sun, Mar 06, 2022 at 06:36:35PM -0800, Randy Dunlap wrote:
>
>
>On 3/6/22 17:54, Dust Li wrote:
>> kernel test robot reports multiple warning for smc_sysctl:
>
>when SYSCTL is not enabled
>(AFAIK)

Right. CONFIG_SMC=m|y and CONFIG_SYSCTL is not enabled.

>
>>   In file included from net/smc/smc_sysctl.c:17:
>>>> net/smc/smc_sysctl.h:23:5: warning: no previous prototype \
>> 	for function 'smc_sysctl_init' [-Wmissing-prototypes]
>>   int smc_sysctl_init(void)
>>        ^
>> and
>>   >> WARNING: modpost: vmlinux.o(.text+0x12ced2d): Section mismatch \
>>   in reference from the function smc_sysctl_exit() to the variable
>>   .init.data:smc_sysctl_ops
>>   The function smc_sysctl_exit() references
>>   the variable __initdata smc_sysctl_ops.
>>   This is often because smc_sysctl_exit lacks a __initdata
>>   annotation or the annotation of smc_sysctl_ops is wrong.
>> 
>> and
>>   net/smc/smc_sysctl.c: In function 'smc_sysctl_init_net':
>>   net/smc/smc_sysctl.c:47:17: error: 'struct netns_smc' has no member named 'smc_hdr'
>>      47 |         net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
>> 
>> Since we don't need global sysctl initialization. To make things
>> clean and simple, remove the global pernet_operations and
>> smc_sysctl_{init|exit}. Call smc_sysctl_net_{init|exit} directly
>> from smc_net_{init|exit}.
>> 
>> Also initialized sysctl_autocorking_size if CONFIG_SYSCTL it not
>> set, this make sure SMC autocorking is enabled by default if
>> CONFIG_SYSCTL is not set.
>> 
>> Fixes: 462791bbfa35 ("net/smc: add sysctl interface for SMC")
>> Reported-by: kernel test robot <lkp@...el.com>
>> Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>
>> 
>> ---
>> v3: 1. add __net_{init|exit} annotation for smc_sysctl_net_{init|exit}
>>        sugguested by Jakub Kicinski
>>     2. Remove static inline for smc_sysctl_net_{init|exit} if
>>        CONFIG_SYSCTL not defined
>> v2: 1. Removes pernet_operations and smc_sysctl_{init|exit}
>>     2. Initialize sysctl_autocorking_size if CONFIG_SYSCTL not set
>> ---
>>  net/smc/Makefile     |  3 ++-
>>  net/smc/af_smc.c     | 15 ++++++---------
>>  net/smc/smc_sysctl.c | 19 ++-----------------
>>  net/smc/smc_sysctl.h |  9 +++++----
>>  4 files changed, 15 insertions(+), 31 deletions(-)
>
>Tested-by: Randy Dunlap <rdunlap@...radead.org> # build-tested

Thanks a lot for testing !

>
>thanks.
>
>-- 
>~Randy