Re: [PATCH 1/1] net:openvswitch: check return value of pskb_trim()

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

Hi Yuanjun,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.5-rc2 next-20230718]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yuanjun-Gong/net-openvswitch-check-return-value-of-pskb_trim/20230718-190417
base:   linus/master
patch link:    https://lore.kernel.org/r/20230717145024.27274-1-ruc_gongyuanjun%40163.com
patch subject: [PATCH 1/1] net:openvswitch: check return value of pskb_trim()
config: loongarch-randconfig-r031-20230718 (https://download.01.org/0day-ci/archive/20230719/202307190802.c2sJufoJ-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230719/202307190802.c2sJufoJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307190802.c2sJufoJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/irqflags.h:18,
                    from include/linux/spinlock.h:59,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bvec.h:10,
                    from include/linux/skbuff.h:17,
                    from net/openvswitch/actions.c:8:
   arch/loongarch/include/asm/percpu.h:20:4: error: #error compiler support for the model attribute is necessary when a recent assembler is used
      20 | #  error compiler support for the model attribute is necessary when a recent assembler is used
         |    ^~~~~
   In file included from include/linux/export.h:5,
                    from include/linux/linkage.h:7,
                    from include/linux/kernel.h:17,
                    from include/linux/skbuff.h:13:
   net/openvswitch/actions.c: In function 'do_output':
>> include/linux/compiler.h:55:26: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
      55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
         |                          ^
   net/openvswitch/actions.c:922:25: note: in expansion of macro 'if'
     922 |                         if (skb->len - cutlen > ovs_mac_header_len(key))
         |                         ^~


vim +/else +55 include/linux/compiler.h

2bcd521a684cc9 Steven Rostedt 2008-11-21  49  
2bcd521a684cc9 Steven Rostedt 2008-11-21  50  #ifdef CONFIG_PROFILE_ALL_BRANCHES
2bcd521a684cc9 Steven Rostedt 2008-11-21  51  /*
2bcd521a684cc9 Steven Rostedt 2008-11-21  52   * "Define 'is'", Bill Clinton
2bcd521a684cc9 Steven Rostedt 2008-11-21  53   * "Define 'if'", Steven Rostedt
2bcd521a684cc9 Steven Rostedt 2008-11-21  54   */
a15fd609ad53a6 Linus Torvalds 2019-03-20 @55  #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
a15fd609ad53a6 Linus Torvalds 2019-03-20  56  

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