Re: [PATCH net-next] net: introduce a config option to tweak MAX_SKB_FRAGS

[kernel test robot <lkp@intel.com>]

Hi Eric,

I love your patch! Perhaps something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-introduce-a-config-option-to-tweak-MAX_SKB_FRAGS/20230321-113826
patch link:    https://lore.kernel.org/r/20230321033704.936685-1-eric.dumazet%40gmail.com
patch subject: [PATCH net-next] net: introduce a config option to tweak MAX_SKB_FRAGS
config: loongarch-randconfig-r014-20230319 (https://download.01.org/0day-ci/archive/20230321/202303211503.hDK3soqh-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/d0eaa3eabce1c80d067a739749e4253546417722
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eric-Dumazet/net-introduce-a-config-option-to-tweak-MAX_SKB_FRAGS/20230321-113826
        git checkout d0eaa3eabce1c80d067a739749e4253546417722
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash net/packet/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303211503.hDK3soqh-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:22,
                    from arch/loongarch/include/asm/bug.h:59,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/loongarch/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:56,
                    from include/linux/ipc.h:5,
                    from include/uapi/linux/sem.h:5,
                    from include/linux/sem.h:5,
                    from include/linux/compat.h:14,
                    from include/linux/ethtool.h:17,
                    from net/packet/af_packet.c:51:
   net/packet/af_packet.c: In function 'tpacket_fill_skb':
>> include/linux/kern_levels.h:5:25: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:427:25: note: in definition of macro 'printk_index_wrap'
     427 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:498:9: note: in expansion of macro 'printk'
     498 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
         |                         ^~~~~~~~
   include/linux/printk.h:498:16: note: in expansion of macro 'KERN_ERR'
     498 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~
   net/packet/af_packet.c:2625:25: note: in expansion of macro 'pr_err'
    2625 |                         pr_err("Packet exceed the number of skb frags(%lu)\n",
         |                         ^~~~~~


vim +5 include/linux/kern_levels.h

314ba3520e513a Joe Perches 2012-07-30  4  
04d2c8c83d0e3a Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3a Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3a Joe Perches 2012-07-30  7  

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