tree: https://github.com/sbates130272/linux-p2pmem.git martin/map_sg_cleanup head: eafab2a966d95c80db362d536a3e1bb2444be72d commit: 791c15fb5de785e78fb8c844d3d218c03d193e2c [5/15] MIPS/jazzdma: return error code from vdma_alloc() config: mips-jazz_defconfig (attached as .config) compiler: mipsel-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://github.com/sbates130272/linux-p2pmem/commit/791c15fb5de785e78fb8c... git remote add p2pmem https://github.com/sbates130272/linux-p2pmem.git git fetch --no-tags p2pmem martin/map_sg_cleanup git checkout 791c15fb5de785e78fb8c844d3d218c03d193e2c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): 95 | long vdma_alloc(unsigned long paddr, unsigned long size) | ^~~~~~~~~~ In file included from arch/mips/jazz/jazzdma.c:25: arch/mips/include/asm/jazzdma.h:11:22: note: previous declaration of 'vdma_alloc' was here 11 | extern unsigned long vdma_alloc(unsigned long paddr, unsigned long size); | ^~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from arch/mips/jazz/jazzdma.c:11: arch/mips/jazz/jazzdma.c:177:15: error: conflicting types for 'vdma_alloc' 177 | EXPORT_SYMBOL(vdma_alloc); | ^~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; \ | ^~~ include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL' 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:158:29: note: in expansion of macro '_EXPORT_SYMBOL' 158 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ arch/mips/jazz/jazzdma.c:177:1: note: in expansion of macro 'EXPORT_SYMBOL' 177 | EXPORT_SYMBOL(vdma_alloc); | ^~~~~~~~~~~~~ In file included from arch/mips/jazz/jazzdma.c:25: arch/mips/include/asm/jazzdma.h:11:22: note: previous declaration of 'vdma_alloc' was here 11 | extern unsigned long vdma_alloc(unsigned long paddr, unsigned long size); | ^~~~~~~~~~ arch/mips/jazz/jazzdma.c: In function 'jazz_dma_map_sg': 554 | if ((int) sg_dma_address < 0) | ^~~~~~~~~~~~~~ | set_dma_addr arch/mips/jazz/jazzdma.c:554:13: note: each undeclared identifier is reported only once for each function it appears in vim +/vdma_alloc +95 arch/mips/jazz/jazzdma.c 91 92 /* 93 * Allocate DMA pagetables using a simple first-fit algorithm 94 */ 96 { 97 int first, last, pages, frame, i; 98 unsigned long laddr, flags; 99 100 /* check arguments */ 101 102 if (paddr > 0x1fffffff) { 103 if (vdma_debug) 104 printk("vdma_alloc: Invalid physical address: %08lx\n", 105 paddr); 106 return -EINVAL; /* invalid physical address */ 107 } 108 if (size > 0x400000 || size == 0) { 109 if (vdma_debug) 110 printk("vdma_alloc: Invalid size: %08lx\n", size); 111 return -EINVAL; /* invalid physical address */ 112 } 113 114 spin_lock_irqsave(&vdma_lock, flags); 115 /* 116 * Find free chunk 117 */ 118 pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1; 119 first = 0; 120 while (1) { 121 while (pgtbl[first].owner != VDMA_PAGE_EMPTY && 122 first < VDMA_PGTBL_ENTRIES) first++; 123 if (first + pages > VDMA_PGTBL_ENTRIES) { /* nothing free */ 124 spin_unlock_irqrestore(&vdma_lock, flags); 125 return -ENOMEM; 126 } 127 128 last = first + 1; 129 while (pgtbl[last].owner == VDMA_PAGE_EMPTY 130 && last - first < pages) 131 last++; 132 133 if (last - first == pages) 134 break; /* found */ 135 first = last + 1; 136 } 137 138 /* 139 * Mark pages as allocated 140 */ 141 laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1)); 142 frame = paddr & ~(VDMA_PAGESIZE - 1); 143 144 for (i = first; i < last; i++) { 145 pgtbl[i].frame = frame; 146 pgtbl[i].owner = laddr; 147 frame += VDMA_PAGESIZE; 148 } 149 150 /* 151 * Update translation table and return logical start address 152 */ 153 r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0); 154 155 if (vdma_debug > 1) 156 printk("vdma_alloc: Allocated %d pages starting from %08lx\n", 157 pages, laddr); 158 159 if (vdma_debug > 2) { 160 printk("LADDR: "); 161 for (i = first; i < last; i++) 162 printk("%08x ", i << 12); 163 printk("\nPADDR: "); 164 for (i = first; i < last; i++) 165 printk("%08x ", pgtbl[i].frame); 166 printk("\nOWNER: "); 167 for (i = first; i < last; i++) 168 printk("%08x ", pgtbl[i].owner); 169 printk("\n"); 170 } 171 172 spin_unlock_irqrestore(&vdma_lock, flags); 173 174 return laddr; 175 } 176 178 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org