linux-kernel - Re: [PATCH 4/7] x86/percpu: Clean up percpu_add

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Date:   Mon, 18 May 2020 03:18:09 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Brian Gerst <brgerst@...il.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Cc:     kbuild-all@...ts.01.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 4/7] x86/percpu: Clean up percpu_add_op()

Hi Brian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on dennis-percpu/for-next]
[also build test WARNING on tip/auto-latest linus/master linux/master v5.7-rc5 next-20200515]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Brian-Gerst/x86-Clean-up-percpu-operations/20200517-233137
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git for-next
config: i386-allmodconfig (attached as .config)
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-193-gb8fad4bc-dirty
        # save the attached .config to linux build tree
        make C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

   net/ipv4/af_inet.c:1472:59: sparse: sparse: restricted __be16 degrades to integer
   include/net/tcp.h:1521:9: sparse: sparse: cast truncates bits from constant value (1d4c0 becomes c0)
>> include/net/tcp.h:1521:9: sparse: sparse: cast truncates bits from constant value (1d4c0 becomes d4c0)

vim +1521 include/net/tcp.h

^1da177e4c3f41 Linus Torvalds  2005-04-16  1512  
7970ddc8f9ffe1 Eric Dumazet    2015-03-16  1513  bool tcp_oow_rate_limited(struct net *net, const struct sk_buff *skb,
7970ddc8f9ffe1 Eric Dumazet    2015-03-16  1514  			  int mib_idx, u32 *last_oow_ack_time);
032ee4236954eb Neal Cardwell   2015-02-06  1515  
a9c19329eccdb1 Pavel Emelyanov 2008-07-16  1516  static inline void tcp_mib_init(struct net *net)
^1da177e4c3f41 Linus Torvalds  2005-04-16  1517  {
^1da177e4c3f41 Linus Torvalds  2005-04-16  1518  	/* See RFC 2012 */
6aef70a851ac77 Eric Dumazet    2016-04-27  1519  	TCP_ADD_STATS(net, TCP_MIB_RTOALGORITHM, 1);
6aef70a851ac77 Eric Dumazet    2016-04-27  1520  	TCP_ADD_STATS(net, TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
6aef70a851ac77 Eric Dumazet    2016-04-27 @1521  	TCP_ADD_STATS(net, TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
6aef70a851ac77 Eric Dumazet    2016-04-27  1522  	TCP_ADD_STATS(net, TCP_MIB_MAXCONN, -1);
^1da177e4c3f41 Linus Torvalds  2005-04-16  1523  }
^1da177e4c3f41 Linus Torvalds  2005-04-16  1524  

:::::: The code at line 1521 was first introduced by commit
:::::: 6aef70a851ac77967992340faaff33f44598f60a net: snmp: kill various STATS_USER() helpers

:::::: TO: Eric Dumazet <edumazet@...gle.com>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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