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Date:   Sat, 24 Feb 2018 17:06:47 +0800
From:   kbuild test robot <lkp@intel.com>
To:     Or Idgar <idgar@virtualoco.com>
Cc:     kbuild-all@01.org, linux-kernel@vger.kernel.org,
        gregkh@linuxfoundation.org, arnd@arndb.de, ghammer@redhat.com,
        Or Idgar <oridgar@gmail.com>
Subject: Re: [PATCH] drivers/virt: vm_gen_counter: initial driver
 implementation
Message-ID: <201802241726.nuC5WB8Z%fengguang.wu@intel.com>
References: <20180222162038.28768-1-idgar@virtualoco.com>
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In-Reply-To: <20180222162038.28768-1-idgar@virtualoco.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Or,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on v4.16-rc2 next-20180223]
[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/Or-Idgar/drivers-virt-vm_gen_counter-initial-driver-implementation/20180224-112017
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/misc/vmgenid.c:35:15: sparse: incorrect type in assignment (different address spaces) @@ expected struct uuid_t @@ got uct uuid_t @@
   drivers/misc/vmgenid.c:35:15: expected struct uuid_t
   drivers/misc/vmgenid.c:35:15: got void
>> drivers/misc/vmgenid.c:40:29: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got strvoid @@
   drivers/misc/vmgenid.c:40:29: expected void
   drivers/misc/vmgenid.c:40:29: got struct uuid_t
   drivers/misc/vmgenid.c:51:15: sparse: incorrect type in assignment (different address spaces) @@ expected struct uuid_t @@ got uct uuid_t @@
   drivers/misc/vmgenid.c:51:15: expected struct uuid_t
   drivers/misc/vmgenid.c:51:15: got void
   drivers/misc/vmgenid.c:55:29: sparse: incorrect type in argument 1 (different address spaces) @@ expected void @@ got strvoid @@
   drivers/misc/vmgenid.c:55:29: expected void
   drivers/misc/vmgenid.c:55:29: got struct uuid_t

vim +35 drivers/misc/vmgenid.c

    28	
    29	static ssize_t generation_id_show(struct device *_d,
    30				      struct device_attribute *attr, char *buf)
    31	{
    32		uuid_t *uuidp;
    33		ssize_t result;
    34	
  > 35		uuidp = acpi_os_map_iomem(phy_addr, sizeof(uuid_t));
    36		if (!uuidp)
    37			return -EFAULT;
    38	
    39		result = sprintf(buf, "%pUl\n", uuidp);
  > 40		acpi_os_unmap_iomem(uuidp, sizeof(uuid_t));
    41		return result;
    42	}
    43	static DEVICE_ATTR_RO(generation_id);
    44	

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