drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:2267:16: warning: taking address of packed member 'hw_tx_obj' of class or structure 'mcp251xfd_tx_obj_load_buf::(anonymous)' may result in an unaligned pointer value

From: kernel test robot
Date: Thu Jul 01 2021 - 03:25:36 EST

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Hi Marc,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dbe69e43372212527abf48609aba7fc39a6daa27
commit: eb79a267c9b3e608e7762a1b221428f37ace3aa3 can: mcp251xfd: rename all remaining occurrence to mcp251xfd
date: 9 months ago
config: mips-buildonly-randconfig-r005-20210630 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb79a267c9b3e608e7762a1b221428f37ace3aa3
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout eb79a267c9b3e608e7762a1b221428f37ace3aa3
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:19:
In file included from include/linux/netdevice.h:37:
In file included from include/linux/ethtool.h:18:
In file included from include/uapi/linux/ethtool.h:19:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:28:
In file included from include/net/checksum.h:22:
arch/mips/include/asm/checksum.h:195:9: error: unsupported inline asm: input with type 'unsigned long' matching output with type '__wsum' (aka 'unsigned int')
: "0" ((__force unsigned long)daddr),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:26:
In file included from drivers/net/can/spi/mcp251xfd/mcp251xfd.h:14:
In file included from include/linux/can/dev.h:21:
In file included from include/linux/can/skb.h:17:
In file included from include/net/sock.h:61:
include/linux/poll.h:142:27: warning: division by zero is undefined [-Wdivision-by-zero]
M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
^~~~~~~~~
include/linux/poll.h:140:32: note: expanded from macro 'M'
#define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:126:51: note: expanded from macro '__MAP'
(from < to ? (v & from) * (to/from) : (v & from) / (from/to))
^ ~~~~~~~~~
include/linux/poll.h:142:39: warning: division by zero is undefined [-Wdivision-by-zero]
M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
^~~~~~~~~
include/linux/poll.h:140:32: note: expanded from macro 'M'
#define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:126:51: note: expanded from macro '__MAP'
(from < to ? (v & from) * (to/from) : (v & from) / (from/to))
^ ~~~~~~~~~
>> drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:2267:16: warning: taking address of packed member 'hw_tx_obj' of class or structure 'mcp251xfd_tx_obj_load_buf::(anonymous)' may result in an unaligned pointer value [-Waddress-of-packed-member]
hw_tx_obj = &load_buf->crc.hw_tx_obj;
^~~~~~~~~~~~~~~~~~~~~~~
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c:2269:16: warning: taking address of packed member 'hw_tx_obj' of class or structure 'mcp251xfd_tx_obj_load_buf::(anonymous)' may result in an unaligned pointer value [-Waddress-of-packed-member]
hw_tx_obj = &load_buf->nocrc.hw_tx_obj;
^~~~~~~~~~~~~~~~~~~~~~~~~
4 warnings and 1 error generated.

vim +2267 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2214
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2215 static void
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2216 mcp251xfd_tx_obj_from_skb(const struct mcp251xfd_priv *priv,
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2217 struct mcp251xfd_tx_obj *tx_obj,
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2218 const struct sk_buff *skb,
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2219 unsigned int seq)
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2220 {
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2221 const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2222 struct mcp251xfd_hw_tx_obj_raw *hw_tx_obj;
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2223 union mcp251xfd_tx_obj_load_buf *load_buf;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2224 u8 dlc;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2225 u32 id, flags;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2226 int offset, len;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2227
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2228 if (cfd->can_id & CAN_EFF_FLAG) {
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2229 u32 sid, eid;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2230
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2231 sid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_SID_MASK, cfd->can_id);
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2232 eid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_EID_MASK, cfd->can_id);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2233
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2234 id = FIELD_PREP(MCP251XFD_OBJ_ID_EID_MASK, eid) |
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2235 FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, sid);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2236
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2237 flags = MCP251XFD_OBJ_FLAGS_IDE;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2238 } else {
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2239 id = FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, cfd->can_id);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2240 flags = 0;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2241 }
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2242
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2243 /* Use the MCP2518FD mask even on the MCP2517FD. It doesn't
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2244 * harm, only the lower 7 bits will be transferred into the
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2245 * TEF object.
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2246 */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2247 dlc = can_len2dlc(cfd->len);
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2248 flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_SEQ_MCP2518FD_MASK, seq) |
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2249 FIELD_PREP(MCP251XFD_OBJ_FLAGS_DLC, dlc);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2250
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2251 if (cfd->can_id & CAN_RTR_FLAG)
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2252 flags |= MCP251XFD_OBJ_FLAGS_RTR;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2253
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2254 /* CANFD */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2255 if (can_is_canfd_skb(skb)) {
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2256 if (cfd->flags & CANFD_ESI)
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2257 flags |= MCP251XFD_OBJ_FLAGS_ESI;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2258
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2259 flags |= MCP251XFD_OBJ_FLAGS_FDF;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2260
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2261 if (cfd->flags & CANFD_BRS)
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2262 flags |= MCP251XFD_OBJ_FLAGS_BRS;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2263 }
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2264
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2265 load_buf = &tx_obj->buf;
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2266 if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX)
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 @2267 hw_tx_obj = &load_buf->crc.hw_tx_obj;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2268 else
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2269 hw_tx_obj = &load_buf->nocrc.hw_tx_obj;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2270
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2271 put_unaligned_le32(id, &hw_tx_obj->id);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2272 put_unaligned_le32(flags, &hw_tx_obj->flags);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2273
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2274 /* Clear data at end of CAN frame */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2275 offset = round_down(cfd->len, sizeof(u32));
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2276 len = round_up(can_dlc2len(dlc), sizeof(u32)) - offset;
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2277 if (MCP251XFD_SANITIZE_CAN && len)
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2278 memset(hw_tx_obj->data + offset, 0x0, len);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2279 memcpy(hw_tx_obj->data, cfd->data, cfd->len);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2280
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2281 /* Number of bytes to be written into the RAM of the controller */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2282 len = sizeof(hw_tx_obj->id) + sizeof(hw_tx_obj->flags);
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2283 if (MCP251XFD_SANITIZE_CAN)
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2284 len += round_up(can_dlc2len(dlc), sizeof(u32));
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2285 else
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2286 len += round_up(cfd->len, sizeof(u32));
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2287
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2288 if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) {
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2289 u16 crc;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2290
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2291 mcp251xfd_spi_cmd_crc_set_len_in_ram(&load_buf->crc.cmd,
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2292 len);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2293 /* CRC */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2294 len += sizeof(load_buf->crc.cmd);
eb79a267c9b3e6 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c Marc Kleine-Budde 2020-09-30 2295 crc = mcp251xfd_crc16_compute(&load_buf->crc, len);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2296 put_unaligned_be16(crc, (void *)load_buf + len);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2297
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2298 /* Total length */
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2299 len += sizeof(load_buf->crc.crc);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2300 } else {
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2301 len += sizeof(load_buf->nocrc.cmd);
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2302 }
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2303
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2304 tx_obj->xfer[0].len = len;
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2305 }
55e5b97f003e85 drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c Marc Kleine-Budde 2020-09-18 2306

:::::: The code at line 2267 was first introduced by commit
:::::: 55e5b97f003e85e66babb55f357627d52081a264 can: mcp25xxfd: add driver for Microchip MCP25xxFD SPI CAN

:::::: TO: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
:::::: CC: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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