Hi Andrew, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: cb690f5238d71f543f4ce874aa59237cf53a877c commit: 03dfd157670bd715306dce1507b8998cabd38539 drivers: net: xilinx_emaclite: Add COMPILE_TEST support date: 12 months ago config: sparc-randconfig-s032-20211109 (attached as .config) compiler: sparc64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 03dfd157670bd715306dce1507b8998cabd38539 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc SHELL=/bin/bash arch/sparc/vdso/ drivers/gpu/drm/ drivers/net/ethernet/xilinx/ drivers/net/wireguard/ fs/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/net/ethernet/xilinx/xilinx_emaclite.c:427:36: sparse: sparse: cast to restricted __be32 vim +417 drivers/net/ethernet/xilinx/xilinx_emaclite.c bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 368 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 369 /** bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 370 * xemaclite_recv_data - Receive a frame bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 371 * @drvdata: Pointer to the Emaclite device private data bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 372 * @data: Address where the data is to be received f713d50f33c1fbd drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 373 * @maxlen: Maximum supported ethernet packet length bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 374 * bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 375 * This function is intended to be called from the interrupt context or bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 376 * with a wrapper which waits for the receive frame to be available. bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 377 * bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 378 * Return: Total number of bytes received bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 379 */ cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 380 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen) bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 381 { bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 382 void __iomem *addr; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 383 u16 length, proto_type; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 384 u32 reg_data; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 385 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 386 /* Determine the expected buffer address */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 387 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 388 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 389 /* Verify which buffer has valid data */ acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 390 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 391 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 392 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 393 if (drvdata->rx_ping_pong != 0) bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 394 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 395 } else { bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 396 /* The instance is out of sync, try other buffer if other bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 397 * buffer is configured, return 0 otherwise. If the instance is bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 398 * out of sync, do not update the 'next_rx_buf_to_use' since it 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 399 * will correct on subsequent calls 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 400 */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 401 if (drvdata->rx_ping_pong != 0) eccd5403814b4e7 drivers/net/ethernet/xilinx/xilinx_emaclite.c Andrew Lunn 2020-11-10 402 addr = (void __iomem __force *) eccd5403814b4e7 drivers/net/ethernet/xilinx/xilinx_emaclite.c Andrew Lunn 2020-11-10 403 ((uintptr_t __force)addr ^ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 404 XEL_BUFFER_OFFSET); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 405 else bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 406 return 0; /* No data was available */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 407 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 408 /* Verify that buffer has valid data */ acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 409 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 410 if ((reg_data & XEL_RSR_RECV_DONE_MASK) != bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 411 XEL_RSR_RECV_DONE_MASK) bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 412 return 0; /* No data was available */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 413 } bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 414 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 415 /* Get the protocol type of the ethernet frame that arrived 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 416 */ acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 @417 proto_type = ((ntohl(xemaclite_readl(addr + XEL_HEADER_OFFSET + 44180a573ec936c drivers/net/xilinx_emaclite.c Michal Simek 2010-09-10 418 XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) & bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 419 XEL_RPLR_LENGTH_MASK); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 420 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 421 /* Check if received ethernet frame is a raw ethernet frame 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 422 * or an IP packet or an ARP packet 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 423 */ cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 424 if (proto_type > ETH_DATA_LEN) { bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 425 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 426 if (proto_type == ETH_P_IP) { acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 427 length = ((ntohl(xemaclite_readl(addr + bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 428 XEL_HEADER_IP_LENGTH_OFFSET + 44180a573ec936c drivers/net/xilinx_emaclite.c Michal Simek 2010-09-10 429 XEL_RXBUFF_OFFSET)) >> bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 430 XEL_HEADER_SHIFT) & bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 431 XEL_RPLR_LENGTH_MASK); cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 432 length = min_t(u16, length, ETH_DATA_LEN); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 433 length += ETH_HLEN + ETH_FCS_LEN; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 434 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 435 } else if (proto_type == ETH_P_ARP) bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 436 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 437 else bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 438 /* Field contains type other than IP or ARP, use max 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 439 * frame size and let user parse it 49a83f002731dbf drivers/net/ethernet/xilinx/xilinx_emaclite.c Radhey Shyam Pandey 2018-06-28 440 */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 441 length = ETH_FRAME_LEN + ETH_FCS_LEN; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 442 } else bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 443 /* Use the length in the frame, plus the header and trailer */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 444 length = proto_type + ETH_HLEN + ETH_FCS_LEN; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 445 cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 446 if (WARN_ON(length > maxlen)) cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 447 length = maxlen; cd224553641848d drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 448 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 449 /* Read from the EmacLite device */ bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 450 xemaclite_aligned_read((u32 __force *)(addr + XEL_RXBUFF_OFFSET), bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 451 data, length); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 452 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 453 /* Acknowledge the frame */ acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 454 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 455 reg_data &= ~XEL_RSR_RECV_DONE_MASK; acf138f1b00bdd1 drivers/net/ethernet/xilinx/xilinx_emaclite.c Anssi Hannula 2017-02-14 456 xemaclite_writel(reg_data, addr + XEL_RSR_OFFSET); bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 457 bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 458 return length; bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 459 } bb81b2ddfa194b6 drivers/net/xilinx_emaclite.c John Linn 2009-08-20 460 :::::: The code at line 417 was first introduced by commit :::::: acf138f1b00bdd1b7cd9894562ed0c2a1670888e net: xilinx_emaclite: fix freezes due to unordered I/O :::::: TO: Anssi Hannula <anssi.hannula(a)bitwise.fi&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org