tree: git://git.infradead.org/users/hch/block.git block-bounce-cleanup head: 6b1b8e36f63fe989298a53f04961018c1785f0b3 commit: 6b1b8e36f63fe989298a53f04961018c1785f0b3 [6/6] block: only build the block layer bounce buffering if drivers need it config: x86_64-randconfig-s022-20210311 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-262-g5e674421-dirty git remote add hch-block git://git.infradead.org/users/hch/block.git git fetch --no-tags hch-block block-bounce-cleanup git checkout 6b1b8e36f63fe989298a53f04961018c1785f0b3 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: block/blk-mq.o: in function `blk_queue_bounce': vim +332 block/blk.h 6922ed82e514a6 Christoph Hellwig 2021-03-11 328 3bce016a4c5975 Christoph Hellwig 2017-06-19 329 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) 3bce016a4c5975 Christoph Hellwig 2017-06-19 330 { 6922ed82e514a6 Christoph Hellwig 2021-03-11 331 if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio))) 6922ed82e514a6 Christoph Hellwig 2021-03-11 @332 __blk_queue_bounce(q, bio); 3bce016a4c5975 Christoph Hellwig 2017-06-19 333 } 3bce016a4c5975 Christoph Hellwig 2017-06-19 334 :::::: The code at line 332 was first introduced by commit :::::: 6922ed82e514a69c601c501b5eca1eed2041a710 block: refactor the bounce buffering code :::::: TO: Christoph Hellwig <hch(a)lst.de&gt; :::::: CC: Christoph Hellwig <hch(a)lst.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org