linux-kernel - drivers/infiniband/core/nldev.c:2187:1: warning: unused function '__chk_RDMA_NL

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Message-ID: <202108220212.7V3pjh3Y-lkp@intel.com>
Date:   Sun, 22 Aug 2021 02:19:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: drivers/infiniband/core/nldev.c:2187:1: warning: unused function
 '__chk_RDMA_NL_NLDEV'

Hi Eric,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   002c0aef109067168ae68ee69b5ce67edc2e63c1
commit: 919067cc845f323a80b6fe987b64238bd82d309e net: add CONFIG_PCPU_DEV_REFCNT
date:   5 months ago
config: mips-randconfig-r013-20210821 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9e9d70591e72fc6762b4b9a226b68ed1307419bf)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=919067cc845f323a80b6fe987b64238bd82d309e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 919067cc845f323a80b6fe987b64238bd82d309e
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=mips SHELL=/bin/bash drivers/infiniband/core/

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/infiniband/core/nldev.c:2187:1: warning: unused function '__chk_RDMA_NL_NLDEV'
   MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_NLDEV, 5);
   ^
   include/rdma/rdma_netlink.h:33:21: note: expanded from macro 'MODULE_ALIAS_RDMA_NETLINK'
   static inline void __chk_##_index(void) ^
   <scratch space>:42:1: note: expanded from here
   __chk_RDMA_NL_NLDEV
   ^
   fatal error: error in backend: Nested variants found in inline asm string: ' .set push
   .set mips64r2
   .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 154, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $1, $2 # atomic_fetch_sub
   subu $0, $1, $3
   sc $0, $2
   beqz $0, 1b
   .set pop
   move $0, $1
   '
   clang-14: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 14.0.0 (git://gitmirror/llvm_project 9e9d70591e72fc6762b4b9a226b68ed1307419bf)
   Target: mipsel-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-9e9d70591e/bin
   clang-14: note: diagnostic msg:
   Makefile arch drivers include kernel mm net nr_bisected scripts source usr


vim +/__chk_RDMA_NL_NLDEV +2187 drivers/infiniband/core/nldev.c

e3bf14bdc17a8e Jason Gunthorpe 2017-08-14  2186  
e3bf14bdc17a8e Jason Gunthorpe 2017-08-14 @2187  MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_NLDEV, 5);

:::::: The code at line 2187 was first introduced by commit
:::::: e3bf14bdc17a8e917f337760cc7cacf3232d7dbc rdma: Autoload netlink client modules

:::::: TO: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
:::::: CC: Doug Ledford <dledford@...hat.com>

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

Download attachment ".config.gz" of type "application/gzip" (40598 bytes)