netdev - Re: [PATCH net-next v13 2/3] xen networking: add basic XDP support for xen-netfront

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Date:   Sat, 27 Jun 2020 10:42:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Denis Kirjanov <kda@...ux-powerpc.org>, netdev@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        brouer@...hat.com, jgross@...e.com, wei.liu@...nel.org,
        paul@....org, ilias.apalodimas@...aro.org
Subject: Re: [PATCH net-next v13 2/3] xen networking: add basic XDP support
 for xen-netfront

Hi Denis,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Denis-Kirjanov/xen-networking-add-XDP-support-to-xen-netfront/20200626-194340
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 7bed14551659875e1cd23a7c0266394a29a773b3
config: arm64-randconfig-r021-20200624 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 6e11ed52057ffc39941cb2de6d93cae522db4782)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> drivers/net/xen-netfront.c:1426:8: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
                               headroom);
                               ^~~~~~~~
   1 warning generated.

vim +1426 drivers/net/xen-netfront.c

  1417	
  1418	static int talk_to_netback_xdp(struct netfront_info *np, int xdp)
  1419	{
  1420		int err;
  1421		int headroom;
  1422	
  1423		headroom = xdp ? XDP_PACKET_HEADROOM : 0;
  1424		err = xenbus_printf(XBT_NIL, np->xbdev->nodename,
  1425				    "xdp-headroom", "%hu",
> 1426				    headroom);
  1427		if (err)
  1428			pr_warn("Error writing xdp-headroom\n");
  1429	
  1430		return err;
  1431	}
  1432	

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

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