[linux-stable-rc:linux-4.19.y 2415/3807] arch/riscv/include/asm/processor.h:82:2: error: implicit declaration of function 'barrier'

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

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Hi Arvind,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
head:   bbd08292bae4049381e5537588ba9f581456c4d5
commit: b207caff4176e3a6ba273243da2db2e595e4aad2 [2415/3807] compiler.h: fix barrier_data() on clang
config: riscv-allyesconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=b207caff4176e3a6ba273243da2db2e595e4aad2
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.19.y
        git checkout b207caff4176e3a6ba273243da2db2e595e4aad2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

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

All errors (new ones prefixed by >>):

   In file included from include/linux/prefetch.h:15,
                    from drivers/net/ethernet/intel/i40e/i40e_txrx.c:4:
   arch/riscv/include/asm/processor.h: In function 'cpu_relax':
>> arch/riscv/include/asm/processor.h:82:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration]
      82 |  barrier();
         |  ^~~~~~~
   In file included from include/linux/sctp.h:57,
                    from drivers/net/ethernet/intel/i40e/i40e.h:23,
                    from drivers/net/ethernet/intel/i40e/i40e_txrx.c:8:
   include/uapi/linux/sctp.h: At top level:
   include/uapi/linux/sctp.h:390:1: warning: alignment 4 of 'struct sctp_paddr_change' is less than 8 [-Wpacked-not-aligned]
     390 | } __attribute__((packed, aligned(4)));
         | ^
   include/uapi/linux/sctp.h:719:1: warning: alignment 4 of 'struct sctp_setpeerprim' is less than 8 [-Wpacked-not-aligned]
     719 | } __attribute__((packed, aligned(4)));
         | ^
   include/uapi/linux/sctp.h:718:26: warning: 'sspp_addr' offset 4 in 'struct sctp_setpeerprim' isn't aligned to 8 [-Wpacked-not-aligned]
     718 |  struct sockaddr_storage sspp_addr;
         |                          ^~~~~~~~~
   include/uapi/linux/sctp.h:732:1: warning: alignment 4 of 'struct sctp_prim' is less than 8 [-Wpacked-not-aligned]
     732 | } __attribute__((packed, aligned(4)));
         | ^
   include/uapi/linux/sctp.h:731:26: warning: 'ssp_addr' offset 4 in 'struct sctp_prim' isn't aligned to 8 [-Wpacked-not-aligned]
     731 |  struct sockaddr_storage ssp_addr;
         |                          ^~~~~~~~
   include/uapi/linux/sctp.h:783:1: warning: alignment 4 of 'struct sctp_paddrparams' is less than 8 [-Wpacked-not-aligned]
     783 | } __attribute__((packed, aligned(4)));
         | ^
   include/uapi/linux/sctp.h:775:26: warning: 'spp_address' offset 4 in 'struct sctp_paddrparams' isn't aligned to 8 [-Wpacked-not-aligned]
     775 |  struct sockaddr_storage spp_address;
         |                          ^~~~~~~~~~~
   include/uapi/linux/sctp.h:896:1: warning: alignment 4 of 'struct sctp_paddrinfo' is less than 8 [-Wpacked-not-aligned]
     896 | } __attribute__((packed, aligned(4)));
         | ^
   include/uapi/linux/sctp.h:890:26: warning: 'spinfo_address' offset 4 in 'struct sctp_paddrinfo' isn't aligned to 8 [-Wpacked-not-aligned]
     890 |  struct sockaddr_storage spinfo_address;
         |                          ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/barrier +82 arch/riscv/include/asm/processor.h

7db91e57a0acde Palmer Dabbelt 2017-07-10  73  
7db91e57a0acde Palmer Dabbelt 2017-07-10  74  
7db91e57a0acde Palmer Dabbelt 2017-07-10  75  static inline void cpu_relax(void)
7db91e57a0acde Palmer Dabbelt 2017-07-10  76  {
7db91e57a0acde Palmer Dabbelt 2017-07-10  77  #ifdef __riscv_muldiv
7db91e57a0acde Palmer Dabbelt 2017-07-10  78  	int dummy;
7db91e57a0acde Palmer Dabbelt 2017-07-10  79  	/* In lieu of a halt instruction, induce a long-latency stall. */
7db91e57a0acde Palmer Dabbelt 2017-07-10  80  	__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
7db91e57a0acde Palmer Dabbelt 2017-07-10  81  #endif
7db91e57a0acde Palmer Dabbelt 2017-07-10 @82  	barrier();
7db91e57a0acde Palmer Dabbelt 2017-07-10  83  }
7db91e57a0acde Palmer Dabbelt 2017-07-10  84  

:::::: The code at line 82 was first introduced by commit
:::::: 7db91e57a0acde126a162ababfb1e0ab190130cb RISC-V: Task implementation

:::::: TO: Palmer Dabbelt <palmer@dabbelt.com>
:::::: CC: Palmer Dabbelt <palmer@dabbelt.com>

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

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