tree: git://git.infradead.org/users/hch/misc.git dma_alloc_pages head: a16b2f06eb63d5638da06476cd7d21cac6ccf955 commit: 250f1c6e2d5b33ccd5650a4e3b3384b646edea3c [34/37] dma-mapping: add a new dma_alloc_pages API config: s390-randconfig-r021-20200917 (attached as .config) compiler: s390-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 git checkout 250f1c6e2d5b33ccd5650a4e3b3384b646edea3c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 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 >>): s390-linux-ld: kernel/dma/direct.o: in function `dma_direct_free': s390-linux-ld: kernel/dma/direct.o: in function `dma_direct_free_pages': kernel/dma/direct.c:330: undefined reference to `dma_free_from_pool' git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc dma_alloc_pages git checkout 250f1c6e2d5b33ccd5650a4e3b3384b646edea3c vim +268 kernel/dma/direct.c a8463d4b0e47d1f lib/dma-noop.c Christian Borntraeger 2016-02-02 254 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 255 void dma_direct_free(struct device *dev, size_t size, 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 256 void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs) a8463d4b0e47d1f lib/dma-noop.c Christian Borntraeger 2016-02-02 257 { c10f07aa27dadf5 lib/dma-direct.c Christoph Hellwig 2018-03-19 258 unsigned int page_order = get_order(size); 080321d3b3139b3 lib/dma-direct.c Christoph Hellwig 2017-12-22 259 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 260 if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) && 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 261 !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 262 dma_alloc_need_uncached(dev, attrs)) { 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 263 arch_dma_free(dev, size, cpu_addr, dma_addr, attrs); 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 264 return; 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 265 } 2f5388a29be82a6 kernel/dma/direct.c Christoph Hellwig 2020-08-17 266 76a19940bd62a81 kernel/dma/direct.c David Rientjes 2020-04-14 267 /* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */ 76a19940bd62a81 kernel/dma/direct.c David Rientjes 2020-04-14 @268 if (dma_should_free_from_pool(dev, attrs) && 76a19940bd62a81 kernel/dma/direct.c David Rientjes 2020-04-14 269 dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size))) 76a19940bd62a81 kernel/dma/direct.c David Rientjes 2020-04-14 270 return; 76a19940bd62a81 kernel/dma/direct.c David Rientjes 2020-04-14 271 cf14be0b41c659e kernel/dma/direct.c Christoph Hellwig 2019-08-06 272 if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && cf14be0b41c659e kernel/dma/direct.c Christoph Hellwig 2019-08-06 273 !force_dma_unencrypted(dev)) { d98849aff879110 kernel/dma/direct.c Christoph Hellwig 2019-06-14 274 /* cpu_addr is a struct page cookie, not a kernel address */ acaade1af358713 kernel/dma/direct.c Christoph Hellwig 2019-10-29 275 dma_free_contiguous(dev, cpu_addr, size); d98849aff879110 kernel/dma/direct.c Christoph Hellwig 2019-06-14 276 return; d98849aff879110 kernel/dma/direct.c Christoph Hellwig 2019-06-14 277 } d98849aff879110 kernel/dma/direct.c Christoph Hellwig 2019-06-14 278 9087c37584fb7d8 kernel/dma/direct.c Tom Lendacky 2019-07-10 279 if (force_dma_unencrypted(dev)) c10f07aa27dadf5 lib/dma-direct.c Christoph Hellwig 2018-03-19 280 set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order); c30700db9eaabb3 kernel/dma/direct.c Christoph Hellwig 2019-06-03 281 3acac065508f6cc kernel/dma/direct.c Christoph Hellwig 2019-10-29 282 if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) 3acac065508f6cc kernel/dma/direct.c Christoph Hellwig 2019-10-29 283 vunmap(cpu_addr); 999a5d1203baa7c kernel/dma/direct.c Christoph Hellwig 2020-02-21 284 else if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED)) 999a5d1203baa7c kernel/dma/direct.c Christoph Hellwig 2020-02-21 285 arch_dma_clear_uncached(cpu_addr, size); 3acac065508f6cc kernel/dma/direct.c Christoph Hellwig 2019-10-29 286 3acac065508f6cc kernel/dma/direct.c Christoph Hellwig 2019-10-29 287 dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size); a8463d4b0e47d1f lib/dma-noop.c Christian Borntraeger 2016-02-02 288 } a8463d4b0e47d1f lib/dma-noop.c Christian Borntraeger 2016-02-02 289 :::::: The code at line 268 was first introduced by commit :::::: 76a19940bd62a81148c303f3df6d0cee9ae4b509 dma-direct: atomic allocations must come from atomic coherent pools :::::: TO: David Rientjes <rientjes(a)google.com&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