Hi Alexandru, I love your patch! Perhaps something to improve: [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on linus/master linux/master v5.10-rc3 next-20201113] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Alexandru-Ardelean/uio-pruss-mov... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 1987f112f1425cba2671d878f6952087e9456a0a config: riscv-randconfig-r003-20201111 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 874b0a0b9db93f5d3350ffe6b5efda2d908415d0) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/37416440d4299a08c6f1a2dc448f7e924... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexandru-Ardelean/uio-pruss-move-simple-allocations-to-dem_-equivalents/20201111-192014 git checkout 37416440d4299a08c6f1a2dc448f7e9249f303ad # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): return ret; ^~~ drivers/uio/uio_pruss.c:121:9: note: initialize the variable 'ret' to silence this warning int ret, cnt, i, len; ^ = 0 1 warning generated. vim +/ret +136 drivers/uio/uio_pruss.c 114 115 static int pruss_probe(struct platform_device *pdev) 116 { 117 struct uio_info *p; 118 struct uio_pruss_dev *gdev; 119 struct resource *regs_prussio; 120 struct device *dev = &pdev->dev; 121 int ret, cnt, i, len; 122 struct uio_pruss_pdata *pdata = dev_get_platdata(dev); 123 124 gdev = devm_kzalloc(dev, sizeof(struct uio_pruss_dev), GFP_KERNEL); 125 if (!gdev) 126 return -ENOMEM; 127 128 gdev->info = devm_kcalloc(dev, MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL); 129 if (!gdev->info) 130 return -ENOMEM; 131 132 /* Power on PRU in case its not done as part of boot-loader */ 133 gdev->pruss_clk = devm_clk_get(dev, "pruss"); 134 if (IS_ERR(gdev->pruss_clk)) { 135 dev_err(dev, "Failed to get clock\n"); 137 } 138 139 ret = clk_enable(gdev->pruss_clk); 140 if (ret) { 141 dev_err(dev, "Failed to enable clock\n"); 142 return ret; 143 } 144 145 regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0); 146 if (!regs_prussio) { 147 dev_err(dev, "No PRUSS I/O resource specified\n"); 148 ret = -EIO; 149 goto err_clk_disable; 150 } 151 152 if (!regs_prussio->start) { 153 dev_err(dev, "Invalid memory resource\n"); 154 ret = -EIO; 155 goto err_clk_disable; 156 } 157 158 if (pdata->sram_pool) { 159 gdev->sram_pool = pdata->sram_pool; 160 gdev->sram_vaddr = 161 (unsigned long)gen_pool_dma_alloc(gdev->sram_pool, 162 sram_pool_sz, &gdev->sram_paddr); 163 if (!gdev->sram_vaddr) { 164 dev_err(dev, "Could not allocate SRAM pool\n"); 165 ret = -ENOMEM; 166 goto err_clk_disable; 167 } 168 } 169 170 gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz, 171 &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA); 172 if (!gdev->ddr_vaddr) { 173 dev_err(dev, "Could not allocate external memory\n"); 174 ret = -ENOMEM; 175 goto err_free_sram; 176 } 177 178 len = resource_size(regs_prussio); 179 gdev->prussio_vaddr = ioremap(regs_prussio->start, len); 180 if (!gdev->prussio_vaddr) { 181 dev_err(dev, "Can't remap PRUSS I/O address range\n"); 182 ret = -ENOMEM; 183 goto err_free_ddr_vaddr; 184 } 185 186 gdev->pintc_base = pdata->pintc_base; 187 gdev->hostirq_start = platform_get_irq(pdev, 0); 188 189 for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) { 190 p->mem[0].addr = regs_prussio->start; 191 p->mem[0].size = resource_size(regs_prussio); 192 p->mem[0].memtype = UIO_MEM_PHYS; 193 194 p->mem[1].addr = gdev->sram_paddr; 195 p->mem[1].size = sram_pool_sz; 196 p->mem[1].memtype = UIO_MEM_PHYS; 197 198 p->mem[2].addr = gdev->ddr_paddr; 199 p->mem[2].size = extram_pool_sz; 200 p->mem[2].memtype = UIO_MEM_PHYS; 201 202 p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt); 203 p->version = DRV_VERSION; 204 205 /* Register PRUSS IRQ lines */ 206 p->irq = gdev->hostirq_start + cnt; 207 p->handler = pruss_handler; 208 p->priv = gdev; 209 210 ret = uio_register_device(dev, p); 211 if (ret < 0) 212 goto err_unloop; 213 } 214 215 platform_set_drvdata(pdev, gdev); 216 return 0; 217 218 err_unloop: 219 for (i = 0, p = gdev->info; i < cnt; i++, p++) { 220 uio_unregister_device(p); 221 } 222 iounmap(gdev->prussio_vaddr); 223 err_free_ddr_vaddr: 224 dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr, 225 gdev->ddr_paddr); 226 err_free_sram: 227 if (pdata->sram_pool) 228 gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz); 229 err_clk_disable: 230 clk_disable(gdev->pruss_clk); 231 232 return ret; 233 } 234 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org