linux-kernel - Re: [PATCH 2/5] nvme: register ns_id attributes as default sysfs groups

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Date:   Wed, 15 Aug 2018 05:53:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Hannes Reinecke <hare@...e.de>
Cc:     kbuild-all@...org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Bart van Assche <bart.vanassche@....com>,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.de>, Hannes Reinecke <hare@...e.com>
Subject: Re: [PATCH 2/5] nvme: register ns_id attributes as default sysfs
 groups

Hi Hannes,

I love your patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on next-20180814]
[cannot apply to v4.18]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Hannes-Reinecke/genhd-register-default-groups-with-device_add_disk/20180815-034942
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   include/uapi/linux/perf_event.h:147:56: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)
   drivers/nvme/host/core.c:506:28: sparse: expression using sizeof(void)
   include/linux/blkdev.h:1269:16: sparse: expression using sizeof(void)
   include/linux/slab.h:631:13: sparse: undefined identifier '__builtin_mul_overflow'
   drivers/nvme/host/core.c:1062:32: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1062:32: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1063:26: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1063:26: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1844:32: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1844:32: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:1846:43: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2406:17: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2406:17: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:2417:42: sparse: expression using sizeof(void)
>> drivers/nvme/host/core.c:2732:30: sparse: symbol 'nvme_ns_id_attr_group' was not declared. Should it be static?
   drivers/nvme/host/core.c:3203:33: sparse: expression using sizeof(void)
   drivers/nvme/host/core.c:3566:17: sparse: expression using sizeof(void)
   include/linux/slab.h:631:13: sparse: call with no type!
   drivers/nvme/host/core.c:1264:23: sparse: context imbalance in 'nvme_get_ns_from_disk' - wrong count at exit
   drivers/nvme/host/core.c:1282:33: sparse: context imbalance in 'nvme_put_ns_from_disk' - unexpected unlock

Please review and possibly fold the followup patch.

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