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From: kernel test robot <lkp@intel.com>
To: Mike Christie <michael.christie@oracle.com>,
	martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
	target-devel@vger.kernel.org, mst@redhat.com,
	jasowang@redhat.com, pbonzini@redhat.com, stefanha@redhat.com,
	virtualization@lists.linux-foundation.org
Cc: kbuild-all@lists.01.org, clang-built-linux@googlegroups.com
Subject: Re: [PATCH 3/8] vhost scsi: alloc cmds per vq instead of session
Date: Tue, 22 Sep 2020 09:32:15 +0800
Message-ID: <202009220914.WjJcrqD4%lkp@intel.com> (raw)
In-Reply-To: <1600712588-9514-4-git-send-email-michael.christie@oracle.com>


[-- Attachment #1: Type: text/plain, Size: 13984 bytes --]

Hi Mike,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vhost/linux-next]
[also build test WARNING on v5.9-rc6 next-20200921]
[cannot apply to target/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Mike-Christie/vhost-scsi-fixes-and-cleanups/20200922-031251
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: s390-randconfig-r022-20200920 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 4e8c028158b56d9c2142a62464e8e0686bde3584)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

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

All warnings (new ones prefixed by >>):

   include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
           ___constant_swab32(x) :                 \
                              ^
   include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32'
           (((__u32)(x) & (__u32)0x0000ff00UL) <<  8) |            \
                     ^
   In file included from drivers/vhost/scsi.c:45:
   In file included from include/uapi/linux/vhost.h:14:
   In file included from include/uapi/linux/vhost_types.h:16:
   In file included from include/linux/virtio_config.h:7:
   In file included from include/linux/virtio.h:7:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:72:
   include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
           ___constant_swab32(x) :                 \
                              ^
   include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32'
           (((__u32)(x) & (__u32)0x00ff0000UL) >>  8) |            \
                     ^
   In file included from drivers/vhost/scsi.c:45:
   In file included from include/uapi/linux/vhost.h:14:
   In file included from include/uapi/linux/vhost_types.h:16:
   In file included from include/linux/virtio_config.h:7:
   In file included from include/linux/virtio.h:7:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:72:
   include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
           ___constant_swab32(x) :                 \
                              ^
   include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32'
           (((__u32)(x) & (__u32)0xff000000UL) >> 24)))
                     ^
   In file included from drivers/vhost/scsi.c:45:
   In file included from include/uapi/linux/vhost.h:14:
   In file included from include/uapi/linux/vhost_types.h:16:
   In file included from include/linux/virtio_config.h:7:
   In file included from include/linux/virtio.h:7:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:72:
   include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32'
           __fswab32(x))
                     ^
   In file included from drivers/vhost/scsi.c:45:
   In file included from include/uapi/linux/vhost.h:14:
   In file included from include/uapi/linux/vhost_types.h:16:
   In file included from include/linux/virtio_config.h:7:
   In file included from include/linux/virtio.h:7:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:72:
   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:511:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
                                            ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:46: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
                                            ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> drivers/vhost/scsi.c:606:28: warning: variable 'cpu' is uninitialized when used here [-Wuninitialized]
           cmd->tvc_se_cmd.map_cpu = cpu;
                                     ^~~
   drivers/vhost/scsi.c:583:14: note: initialize the variable 'cpu' to silence this warning
           int tag, cpu;
                       ^
                        = 0
   21 warnings generated.

# https://github.com/0day-ci/linux/commit/aef0e1e9298ab68f2d7bdf1afb9a376641b993d5
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Mike-Christie/vhost-scsi-fixes-and-cleanups/20200922-031251
git checkout aef0e1e9298ab68f2d7bdf1afb9a376641b993d5
vim +/cpu +606 drivers/vhost/scsi.c

057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  571  
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  572  static struct vhost_scsi_cmd *
aef0e1e9298ab6 drivers/vhost/scsi.c      Mike Christie      2020-09-21  573  vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  574  		   unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  575  		   u32 exp_data_len, int data_direction)
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  576  {
aef0e1e9298ab6 drivers/vhost/scsi.c      Mike Christie      2020-09-21  577  	struct vhost_scsi_virtqueue *svq = container_of(vq,
aef0e1e9298ab6 drivers/vhost/scsi.c      Mike Christie      2020-09-21  578  					struct vhost_scsi_virtqueue, vq);
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  579  	struct vhost_scsi_cmd *cmd;
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  580  	struct vhost_scsi_nexus *tv_nexus;
b1935f687bb93b drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  581  	struct scatterlist *sg, *prot_sg;
3aee26b4ae9104 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  582  	struct page **pages;
10e9cbb6b53111 drivers/vhost/scsi.c      Matthew Wilcox     2018-06-12  583  	int tag, cpu;
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  584  
9871831283e795 drivers/vhost/scsi.c      Asias He           2013-05-06  585  	tv_nexus = tpg->tpg_nexus;
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  586  	if (!tv_nexus) {
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  587  		pr_err("Unable to locate active struct vhost_scsi_nexus\n");
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  588  		return ERR_PTR(-EIO);
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  589  	}
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  590  
aef0e1e9298ab6 drivers/vhost/scsi.c      Mike Christie      2020-09-21  591  	tag = sbitmap_get(&svq->scsi_tags, 0, false);
4a47d3a1ff10e5 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  592  	if (tag < 0) {
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  593  		pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
4a47d3a1ff10e5 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  594  		return ERR_PTR(-ENOMEM);
4a47d3a1ff10e5 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  595  	}
4a47d3a1ff10e5 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  596  
aef0e1e9298ab6 drivers/vhost/scsi.c      Mike Christie      2020-09-21  597  	cmd = &svq->scsi_cmds[tag];
3aee26b4ae9104 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  598  	sg = cmd->tvc_sgl;
b1935f687bb93b drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  599  	prot_sg = cmd->tvc_prot_sgl;
3aee26b4ae9104 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  600  	pages = cmd->tvc_upages;
473f0b15a4c97d drivers/vhost/scsi.c      Markus Elfring     2017-05-20  601  	memset(cmd, 0, sizeof(*cmd));
3aee26b4ae9104 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  602  	cmd->tvc_sgl = sg;
b1935f687bb93b drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  603  	cmd->tvc_prot_sgl = prot_sg;
3aee26b4ae9104 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  604  	cmd->tvc_upages = pages;
4824d3bfb9097a drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-07  605  	cmd->tvc_se_cmd.map_tag = tag;
10e9cbb6b53111 drivers/vhost/scsi.c      Matthew Wilcox     2018-06-12 @606  	cmd->tvc_se_cmd.map_cpu = cpu;
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  607  	cmd->tvc_tag = scsi_tag;
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  608  	cmd->tvc_lun = lun;
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  609  	cmd->tvc_task_attr = task_attr;
3c63f66a0dcdd6 drivers/vhost/scsi.c      Asias He           2013-05-06  610  	cmd->tvc_exp_data_len = exp_data_len;
3c63f66a0dcdd6 drivers/vhost/scsi.c      Asias He           2013-05-06  611  	cmd->tvc_data_direction = data_direction;
3c63f66a0dcdd6 drivers/vhost/scsi.c      Asias He           2013-05-06  612  	cmd->tvc_nexus = tv_nexus;
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  613  	cmd->inflight = vhost_scsi_get_inflight(vq);
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  614  
1a1ff8256af679 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  615  	memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
95e7c4341b8e28 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  616  
3c63f66a0dcdd6 drivers/vhost/scsi.c      Asias He           2013-05-06  617  	return cmd;
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  618  }
057cbf49a1f082 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  619  

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

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  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21 18:23 [PATCH 0/8] vhost scsi: fixes and cleanups Mike Christie
2020-09-21 18:23 ` [PATCH 1/8] vhost vdpa: fix vhost_vdpa_open error handling Mike Christie
2020-09-22  1:58   ` Jason Wang
2020-09-21 18:23 ` [PATCH 2/8] vhost: add helper to check if a vq has been setup Mike Christie
2020-09-22  2:02   ` Jason Wang
2020-09-23 19:12     ` Mike Christie
2020-09-24  7:22       ` Jason Wang
2020-09-22  2:45   ` Bart Van Assche
2020-09-22 15:34     ` Michael Christie
2020-09-21 18:23 ` [PATCH 3/8] vhost scsi: alloc cmds per vq instead of session Mike Christie
2020-09-22  1:32   ` kernel test robot [this message]
2020-09-23  7:53   ` Dan Carpenter
2020-09-24  6:22   ` Michael S. Tsirkin
2020-09-24 15:31     ` Michael Christie
2020-09-21 18:23 ` [PATCH 4/8] vhost scsi: fix cmd completion race Mike Christie
2020-09-22  2:48   ` Bart Van Assche
2020-09-22  2:51     ` Bart Van Assche
2020-09-21 18:23 ` [PATCH 5/8] vhost scsi: add lun parser helper Mike Christie
2020-09-23 10:23   ` Paolo Bonzini
2020-09-21 18:23 ` [PATCH 6/8] vhost scsi: Add support for LUN resets Mike Christie
2020-09-21 18:23 ` [PATCH 7/8] vhost: remove work arg from vhost_work_flush Mike Christie
2020-09-22  2:01   ` Jason Wang
2020-09-21 18:23 ` [PATCH 8/8] vhost scsi: remove extra flushes Mike Christie

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