linux-kernel - drivers/scsi/qla2xxx/qla_edif_bsg.h:93:12: warning: field remote_pid within 'struct app_pinfo_req' is less aligned than 'port_id_t' and is usually due to 'struct app_pinfo_req' being packed, which can lead to unaligned accesses

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Date:   Wed, 9 Feb 2022 01:54:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Quinn Tran <qutran@...vell.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.de>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Larry Wisneski <Larry.Wisneski@...vell.com>,
        Duane Grigsby <duane.grigsby@...vell.com>,
        Rick Hicksted Jr <rhicksted@...vell.com>,
        Nilesh Javali <njavali@...vell.com>
Subject: drivers/scsi/qla2xxx/qla_edif_bsg.h:93:12: warning: field remote_pid
 within 'struct app_pinfo_req' is less aligned than 'port_id_t' and is
 usually due to 'struct app_pinfo_req' being packed, which can lead to
 unaligned accesses

Hi Quinn,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   555f3d7be91a873114c9656069f1a9fa476ec41a
commit: 7878f22a2e03b69baf792f74488962981a1c9547 scsi: qla2xxx: edif: Add getfcinfo and statistic bsgs
date:   7 months ago
config: arm-randconfig-r006-20220208 (https://download.01.org/0day-ci/archive/20220209/202202090106.U3d0uaWb-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7878f22a2e03b69baf792f74488962981a1c9547
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7878f22a2e03b69baf792f74488962981a1c9547
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/scsi/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/scsi/qla2xxx/qla_edif.c:6:
   In file included from drivers/scsi/qla2xxx/qla_def.h:34:
   include/uapi/scsi/scsi_bsg_fc.h:280:4: warning: field rqst_data within 'struct fc_bsg_request' is less aligned than 'union (unnamed union at include/uapi/scsi/scsi_bsg_fc.h:271:2)' and is usually due to 'struct fc_bsg_request' being packed, which can lead to unaligned accesses [-Wunaligned-access]
           } rqst_data;
             ^
   In file included from drivers/scsi/qla2xxx/qla_edif.c:6:
   In file included from drivers/scsi/qla2xxx/qla_def.h:74:
   In file included from drivers/scsi/qla2xxx/qla_bsg.h:298:
>> drivers/scsi/qla2xxx/qla_edif_bsg.h:93:12: warning: field remote_pid within 'struct app_pinfo_req' is less aligned than 'port_id_t' and is usually due to 'struct app_pinfo_req' being packed, which can lead to unaligned accesses [-Wunaligned-access]
           port_id_t remote_pid;
                     ^
   2 warnings generated.


vim +93 drivers/scsi/qla2xxx/qla_edif_bsg.h

7ebb336e45ef1c Quinn Tran 2021-06-23  89  
7ebb336e45ef1c Quinn Tran 2021-06-23  90  struct app_pinfo_req {
7ebb336e45ef1c Quinn Tran 2021-06-23  91  	struct app_id app_info;
7ebb336e45ef1c Quinn Tran 2021-06-23  92  	uint8_t	 num_ports;
7ebb336e45ef1c Quinn Tran 2021-06-23 @93  	port_id_t remote_pid;
7ebb336e45ef1c Quinn Tran 2021-06-23  94  	uint8_t	 reserved[VND_CMD_APP_RESERVED_SIZE];
7ebb336e45ef1c Quinn Tran 2021-06-23  95  } __packed;
7ebb336e45ef1c Quinn Tran 2021-06-23  96  

:::::: The code at line 93 was first introduced by commit
:::::: 7ebb336e45ef1ce23462c3bbd03779929008901f scsi: qla2xxx: edif: Add start + stop bsgs

:::::: TO: Quinn Tran <qutran@...vell.com>
:::::: CC: Martin K. Petersen <martin.petersen@...cle.com>

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