linux-kernel - Re: [PATCH] mtd: mtdoops: optionally dump boottime

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Date:   Mon, 21 May 2018 03:48:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Stefan M Schaeckeler <sschaeck@...co.com>
Cc:     kbuild-all@...org, David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        sschaeck@...co.com
Subject: Re: [PATCH] mtd: mtdoops: optionally dump boottime

Hi Stefan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mtd/master]
[also build test WARNING on v4.17-rc5 next-20180517]
[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/Stefan-M-Schaeckeler/mtd-mtdoops-optionally-dump-boottime/20180521-030143
base:   git://git.infradead.org/linux-mtd.git master
config: x86_64-randconfig-x011-201820 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers//mtd/mtdoops.c: In function 'mtdoops_init':
>> drivers//mtd/mtdoops.c:78:25: warning: format '%d' expects argument of type 'int', but argument 6 has type 'long int' [-Wformat=]
    #define boottime_prefix "<0>[   0.000000] Boot time "
                            ^
>> drivers//mtd/mtdoops.c:410:8: note: in expansion of macro 'boottime_prefix'
           boottime_prefix "%02d/%02d/%4d %02d:%02d:%02d\n",
           ^~~~~~~~~~~~~~~
   drivers//mtd/mtdoops.c:410:37: note: format string is defined here
           boottime_prefix "%02d/%02d/%4d %02d:%02d:%02d\n",
                                      ~~^
                                      %4ld

vim +/boottime_prefix +410 drivers//mtd/mtdoops.c

   395	
   396	static int __init mtdoops_init(void)
   397	{
   398		struct mtdoops_context *cxt = &oops_cxt;
   399		int mtd_index;
   400		char *endp;
   401		struct timespec64 bt;
   402		struct tm tm_val;
   403	
   404		if (dump_boottime) {
   405		    /* Precompute boot time ahead of an oops */
   406		    getboottime64(&bt);
   407		    time_to_tm(bt.tv_sec, 0, &tm_val);
   408	
   409		    snprintf(boottime, sizeof(boottime),
 > 410			     boottime_prefix "%02d/%02d/%4d %02d:%02d:%02d\n",
   411			     tm_val.tm_mon + 1, tm_val.tm_mday, tm_val.tm_year + 1900,
   412			     tm_val.tm_hour, tm_val.tm_min, tm_val.tm_sec);
   413		}
   414	
   415		if (strlen(mtddev) == 0) {
   416			printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied\n");
   417			return -EINVAL;
   418		}
   419		if ((record_size & 4095) != 0) {
   420			printk(KERN_ERR "mtdoops: record_size must be a multiple of 4096\n");
   421			return -EINVAL;
   422		}
   423		if (record_size < 4096) {
   424			printk(KERN_ERR "mtdoops: record_size must be over 4096 bytes\n");
   425			return -EINVAL;
   426		}
   427	
   428		/* Setup the MTD device to use */
   429		cxt->mtd_index = -1;
   430		mtd_index = simple_strtoul(mtddev, &endp, 0);
   431		if (*endp == '\0')
   432			cxt->mtd_index = mtd_index;
   433	
   434		cxt->oops_buf = vmalloc(record_size);
   435		if (!cxt->oops_buf) {
   436			printk(KERN_ERR "mtdoops: failed to allocate buffer workspace\n");
   437			return -ENOMEM;
   438		}
   439		memset(cxt->oops_buf, 0xff, record_size);
   440	
   441		INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
   442		INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
   443	
   444		register_mtd_user(&mtdoops_notifier);
   445		return 0;
   446	}
   447	

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