Hi Wei, I love your patch! Yet something to improve: [auto build test ERROR on next-20191122] [cannot apply to linus/master v5.4-rc8 v5.4-rc7 v5.4-rc6 v5.4] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Wei-Hu/video-hyperv-hyperv_fb-Use-physical-memory-for-fb-on-HyperV-Gen-1-VMs/20191124-163533 base: b9d3d01405061bb42358fe53f824e894a1922ced config: i386-randconfig-b003-20191125 (attached as .config) compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ld: kernel/dma/contiguous.o: in function `dma_alloc_from_contiguous': >> kernel/dma/contiguous.c:199: undefined reference to `cma_alloc' >> ld: kernel/dma/contiguous.c:199: undefined reference to `cma_alloc' ld: kernel/dma/contiguous.o: in function `dma_release_from_contiguous': >> kernel/dma/contiguous.c:215: undefined reference to `cma_release' >> ld: kernel/dma/contiguous.c:215: undefined reference to `cma_release' ld: kernel/dma/contiguous.o: in function `dma_alloc_contiguous': kernel/dma/contiguous.c:248: undefined reference to `cma_alloc' ld: kernel/dma/contiguous.o: in function `dma_free_contiguous': kernel/dma/contiguous.c:267: undefined reference to `cma_release' ld: kernel/dma/contiguous.c:267: undefined reference to `cma_release' ld: kernel/dma/contiguous.o: in function `dma_contiguous_reserve_area': >> kernel/dma/contiguous.c:169: undefined reference to `cma_declare_contiguous' >> ld: kernel/dma/contiguous.c:175: undefined reference to `cma_get_size' >> ld: kernel/dma/contiguous.c:175: undefined reference to `cma_get_base' vim +199 kernel/dma/contiguous.c c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 145 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 146 /** 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 147 * dma_contiguous_reserve_area() - reserve custom contiguous area 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 148 * @size: Size of the reserved area (in bytes), 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 149 * @base: Base address of the reserved area optional, use 0 for any 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 150 * @limit: End address of the reserved memory (optional, 0 for any). 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 151 * @res_cma: Pointer to store the created cma region. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 152 * @fixed: hint about where to place the reserved area 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 153 * 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 154 * This function reserves memory from early allocator. It should be 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 155 * called by arch specific code once the early allocator (memblock or bootmem) 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 156 * has been activated and all other subsystems have already allocated/reserved 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 157 * memory. This function allows to create custom reserved areas for specific 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 158 * devices. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 159 * 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 160 * If @fixed is true, reserve contiguous area at exactly @base. If false, 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 161 * reserve in range from @base to @limit. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 162 */ 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 163 int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 164 phys_addr_t limit, struct cma **res_cma, 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 165 bool fixed) 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 166 { 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 167 int ret; 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 168 f318dd083c8128 drivers/base/dma-contiguous.c Laura Abbott 2017-04-18 @169 ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed, f318dd083c8128 drivers/base/dma-contiguous.c Laura Abbott 2017-04-18 170 "reserved", res_cma); 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 171 if (ret) 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 172 return ret; 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 173 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 174 /* Architecture specific contiguous memory fixup. */ a254129e8686bf drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 @175 dma_contiguous_early_fixup(cma_get_base(*res_cma), a254129e8686bf drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 176 cma_get_size(*res_cma)); 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 177 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 178 return 0; 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 179 } 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 180 c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 181 /** 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 182 * dma_alloc_from_contiguous() - allocate pages from contiguous area 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 183 * @dev: Pointer to device for which the allocation is performed. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 184 * @count: Requested number of pages. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 185 * @align: Requested alignment of pages (in PAGE_SIZE order). d834c5ab83febf kernel/dma/contiguous.c Marek Szyprowski 2018-08-17 186 * @no_warn: Avoid printing message about failed allocation. c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 187 * 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 188 * This function allocates memory buffer for specified device. It uses 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 189 * device specific contiguous memory area if available or the default 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 190 * global one. Requires architecture specific dev_get_cma_area() helper 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 191 * function. c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 192 */ 67a2e213e7e937 drivers/base/dma-contiguous.c Rohit Vaswani 2015-10-22 193 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, d834c5ab83febf kernel/dma/contiguous.c Marek Szyprowski 2018-08-17 194 unsigned int align, bool no_warn) c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 195 { 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 196 if (align > CONFIG_CMA_ALIGNMENT) 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 197 align = CONFIG_CMA_ALIGNMENT; 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 198 d834c5ab83febf kernel/dma/contiguous.c Marek Szyprowski 2018-08-17 @199 return cma_alloc(dev_get_cma_area(dev), count, align, no_warn); c64be2bb1c6eb4 drivers/base/dma-contiguous.c Marek Szyprowski 2011-12-29 200 } 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 201 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 202 /** 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 203 * dma_release_from_contiguous() - release allocated pages 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 204 * @dev: Pointer to device for which the pages were allocated. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 205 * @pages: Allocated pages. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 206 * @count: Number of allocated pages. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 207 * 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 208 * This function releases memory allocated by dma_alloc_from_contiguous(). 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 209 * It returns false when provided pages do not belong to contiguous area and 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 210 * true otherwise. 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 211 */ 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 212 bool dma_release_from_contiguous(struct device *dev, struct page *pages, 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 213 int count) 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 214 { a254129e8686bf drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 @215 return cma_release(dev_get_cma_area(dev), pages, count); 3162bbd7e65b9c drivers/base/dma-contiguous.c Joonsoo Kim 2014-08-06 216 } de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski 2014-10-13 217 :::::: The code at line 199 was first introduced by commit :::::: d834c5ab83febf9624ad3b16c3c348aa1e02014c kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous() :::::: TO: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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