[kbuild-all] [linux-next:master 1888/2932] drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:220:35: warning: variable 'hwvf' is uninitialized when used here

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7468cbf5c917ec48c66b0dd157b306f36345cab8 commit: 23109f8dd06d0bd04c9360cf7c501c97b0ab1545 [1888/2932] octeontx2-af: Introduce internal packet switching config: riscv-randconfig-r012-20210722 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9625ca5b602616b2f5584e8a49ba93c52c141e40) 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 23109f8dd06d0bd04c9360cf7c501c97b0ab1545 # 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 >>): In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:8: In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu.h:14: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:8: In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu.h:14: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:8: In file included from drivers/net/ethernet/marvell/octeontx2/af/rvu.h:14: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ for (vf = 0; vf < numvfs; vf++, hwvf++) { ^~~~ drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:201:26: note: initialize the variable 'hwvf' to silence this warning int pf, vf, numvfs, hwvf; ^ = 0 for (vf = 0; vf < numvfs; vf++, hwvf++) { ^~~~~~ drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c:201:20: note: initialize the variable 'numvfs' to silence this warning int pf, vf, numvfs, hwvf; ^ = 0 9 warnings generated. vim +/hwvf +220 drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c 194 195 void rvu_switch_disable(struct rvu *rvu) 196 { 197 struct npc_delete_flow_req uninstall_req = { 0 }; 198 struct npc_mcam_free_entry_req free_req = { 0 }; 199 struct rvu_switch *rswitch = &rvu->rswitch; 200 struct rvu_hwinfo *hw = rvu->hw; 201 int pf, vf, numvfs, hwvf; 202 struct msg_rsp rsp; 203 u16 pcifunc; 204 int err; 205 206 if (!rswitch->used_entries) 207 return; 208 209 for (pf = 1; pf < hw->total_pfs; pf++) { 210 if (!is_pf_cgxmapped(rvu, pf)) 211 continue; 212 213 pcifunc = pf << 10; 214 err = rvu_switch_install_rx_rule(rvu, pcifunc, 0xFFF); 215 if (err) 216 dev_err(rvu->dev, 217 "Reverting RX rule for PF%d failed(%d)\n", 218 pf, err); 219 221 pcifunc = pf << 10 | ((vf + 1) & 0x3FF); 222 err = rvu_switch_install_rx_rule(rvu, pcifunc, 0xFFF); 223 if (err) 224 dev_err(rvu->dev, 225 "Reverting RX rule for PF%dVF%d failed(%d)\n", 226 pf, vf, err); 227 } 228 } 229 230 uninstall_req.start = rswitch->start_entry; 231 uninstall_req.end = rswitch->start_entry + rswitch->used_entries - 1; 232 free_req.all = 1; 233 rvu_mbox_handler_npc_delete_flow(rvu, &uninstall_req, &rsp); 234 rvu_mbox_handler_npc_mcam_free_entry(rvu, &free_req, &rsp); 235 rswitch->used_entries = 0; 236 kfree(rswitch->entry2pcifunc); 237 } 238 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org