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Message-ID: <202211090228.NAWW2s5z-lkp@intel.com>
Date:   Wed, 9 Nov 2022 02:38:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Karsten Graul <kgraul@...ux.ibm.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: net/smc/smc_llc.c:40:1: warning: alignment 1 of 'struct smc_llc_hdr'
 is less than 4

Hi Karsten,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   59f2f4b8a757412fce372f6d0767bdb55da127a8
commit: b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 net/smc: extend LLC layer for SMC-Rv2
date:   1 year, 1 month ago
config: arm-randconfig-r031-20221108
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash net/smc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> net/smc/smc_llc.c:40:1: warning: alignment 1 of 'struct smc_llc_hdr' is less than 4 [-Wpacked-not-aligned]
      40 | } __packed;             /* format defined in
         | ^
   In file included from <command-line>:
   net/smc/smc_llc.c: In function 'smc_llc_add_pending_send':
   include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_565' declared with attribute error: must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg)
     322 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:303:25: note: in definition of macro '__compiletime_assert'
     303 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:322:9: note: in expansion of macro '_compiletime_assert'
     322 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   net/smc/smc_llc.c:409:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     409 |         BUILD_BUG_ON_MSG(
         |         ^~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:322:45: error: call to '__compiletime_assert_566' declared with attribute error: must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send()
     322 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:303:25: note: in definition of macro '__compiletime_assert'
     303 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:322:9: note: in expansion of macro '_compiletime_assert'
     322 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   net/smc/smc_llc.c:412:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     412 |         BUILD_BUG_ON_MSG(
         |         ^~~~~~~~~~~~~~~~
   In file included from include/linux/string.h:262,
                    from include/linux/bitmap.h:10,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bvec.h:10,
                    from include/linux/skbuff.h:17,
                    from include/linux/tcp.h:17,
                    from include/net/tcp.h:20,
                    from net/smc/smc_llc.c:13:
   In function 'memcpy',
       inlined from 'smc_llc_send_message_wait' at net/smc/smc_llc.c:785:2,
       inlined from 'smc_llc_send_link_delete_all' at net/smc/smc_llc.c:1635:8:
   include/linux/fortify-string.h:187:25: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
     187 |                         __read_overflow2();
         |                         ^~~~~~~~~~~~~~~~~~


vim +40 net/smc/smc_llc.c

    23	
    24	struct smc_llc_hdr {
    25		struct smc_wr_rx_hdr common;
    26		union {
    27			struct {
    28				u8 length;	/* 44 */
    29		#if defined(__BIG_ENDIAN_BITFIELD)
    30				u8 reserved:4,
    31				   add_link_rej_rsn:4;
    32	#elif defined(__LITTLE_ENDIAN_BITFIELD)
    33				u8 add_link_rej_rsn:4,
    34				   reserved:4;
    35	#endif
    36			};
    37			u16 length_v2;	/* 44 - 8192*/
    38		};
    39		u8 flags;
  > 40	} __packed;		/* format defined in
    41				 * IBM Shared Memory Communications Version 2
    42				 * (https://www.ibm.com/support/pages/node/6326337)
    43				 */
    44	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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