linux-kernel - Re: [PATCH v2 1/4] fw

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Date:   Fri, 22 Sep 2017 19:05:58 +0800
From:   kbuild test robot <lkp@...el.com>
To:     marcandre.lureau@...hat.com
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, somlo@....edu,
        qemu-devel@...gnu.org, mst@...hat.com,
        Marc-André Lureau 
        <marcandre.lureau@...hat.com>
Subject: Re: [PATCH v2 1/4] fw_cfg: add DMA register

Hi Marc-André,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc1 next-20170922]
[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/marcandre-lureau-redhat-com/fw_cfg-add-DMA-operations-etc-vmcoreinfo-support/20170922-182716
config: i386-randconfig-x009-201738 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/firmware/qemu_fw_cfg.c: In function 'fw_cfg_cmdline_set':
>> drivers/firmware/qemu_fw_cfg.c:690:43: error: 'process' undeclared (first use in this function)
         (processed != 1 && processed != 3 && process != 4))
                                              ^~~~~~~
   drivers/firmware/qemu_fw_cfg.c:690:43: note: each undeclared identifier is reported only once for each function it appears in

vim +/process +690 drivers/firmware/qemu_fw_cfg.c

   639	
   640	/* use special scanf/printf modifier for phys_addr_t, resource_size_t */
   641	#define PH_ADDR_SCAN_FMT "@%" __PHYS_ADDR_PREFIX "i%n" \
   642				 ":%" __PHYS_ADDR_PREFIX "i" \
   643				 ":%" __PHYS_ADDR_PREFIX "i%n" \
   644				 ":%" __PHYS_ADDR_PREFIX "i%n"
   645	
   646	#define PH_ADDR_PR_1_FMT "0x%" __PHYS_ADDR_PREFIX "x@" \
   647				 "0x%" __PHYS_ADDR_PREFIX "x"
   648	
   649	#define PH_ADDR_PR_3_FMT PH_ADDR_PR_1_FMT \
   650				 ":%" __PHYS_ADDR_PREFIX "u" \
   651				 ":%" __PHYS_ADDR_PREFIX "u"
   652	
   653	#define PH_ADDR_PR_4_FMT PH_ADDR_PR_3_FMT \
   654				 ":%" __PHYS_ADDR_PREFIX "u"
   655	
   656	static int fw_cfg_cmdline_set(const char *arg, const struct kernel_param *kp)
   657	{
   658		struct resource res[4] = {};
   659		char *str;
   660		phys_addr_t base;
   661		resource_size_t size, ctrl_off, data_off, dma_off;
   662		int processed, consumed = 0;
   663	
   664		/* only one fw_cfg device can exist system-wide, so if one
   665		 * was processed on the command line already, we might as
   666		 * well stop here.
   667		 */
   668		if (fw_cfg_cmdline_dev) {
   669			/* avoid leaking previously registered device */
   670			platform_device_unregister(fw_cfg_cmdline_dev);
   671			return -EINVAL;
   672		}
   673	
   674		/* consume "<size>" portion of command line argument */
   675		size = memparse(arg, &str);
   676	
   677		/* get "@<base>[:<ctrl_off>:<data_off>[:<dma_off>]]" chunks */
   678		processed = sscanf(str, PH_ADDR_SCAN_FMT,
   679				   &base, &consumed,
   680				   &ctrl_off, &data_off, &consumed,
   681				   &dma_off, &consumed);
   682	
   683		/* sscanf() must process precisely 1, 3 or 4 chunks:
   684		 * <base> is mandatory, optionally followed by <ctrl_off>
   685		 * and <data_off>, and <dma_off>;
   686		 * there must be no extra characters after the last chunk,
   687		 * so str[consumed] must be '\0'.
   688		 */
   689		if (str[consumed] ||
 > 690		    (processed != 1 && processed != 3 && process != 4))
   691			return -EINVAL;
   692	
   693		res[0].start = base;
   694		res[0].end = base + size - 1;
   695		res[0].flags = !strcmp(kp->name, "mmio") ? IORESOURCE_MEM :
   696							   IORESOURCE_IO;
   697	
   698		/* insert register offsets, if provided */
   699		if (processed > 1) {
   700			res[1].name = "ctrl";
   701			res[1].start = ctrl_off;
   702			res[1].flags = IORESOURCE_REG;
   703			res[2].name = "data";
   704			res[2].start = data_off;
   705			res[2].flags = IORESOURCE_REG;
   706		}
   707		if (processed > 3) {
   708			res[3].name = "dma";
   709			res[3].start = dma_off;
   710			res[3].flags = IORESOURCE_REG;
   711		}
   712	
   713		/* "processed" happens to nicely match the number of resources
   714		 * we need to pass in to this platform device.
   715		 */
   716		fw_cfg_cmdline_dev = platform_device_register_simple("fw_cfg",
   717						PLATFORM_DEVID_NONE, res, processed);
   718		if (IS_ERR(fw_cfg_cmdline_dev))
   719			return PTR_ERR(fw_cfg_cmdline_dev);
   720	
   721		return 0;
   722	}
   723	

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