linux-kernel - Re: [PATCH] s390/dasd: avoid calling do

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Message-ID: <201711082357.XDC7lUyV%fengguang.wu@intel.com>
Date:   Wed, 8 Nov 2017 23:47:48 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...org, Stefan Haberland <sth@...ux.vnet.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Arnd Bergmann <arnd@...db.de>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390/dasd: avoid calling do_gettimeofday()

Hi Arnd,

I love your patch! Yet something to improve:

[auto build test ERROR on s390/features]
[also build test ERROR on v4.14-rc8 next-20171108]
[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/Arnd-Bergmann/s390-dasd-avoid-calling-do_gettimeofday/20171108-213507
base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
config: s390-default_defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=s390 

All errors (new ones prefixed by >>):

   In file included from include/linux/ktime.h:272:0,
                    from include/linux/timer.h:5,
                    from include/linux/workqueue.h:8,
                    from include/linux/srcu.h:34,
                    from include/linux/notifier.h:15,
                    from arch/s390/include/asm/uprobes.h:11,
                    from include/linux/uprobes.h:62,
                    from include/linux/mm_types.h:13,
                    from include/linux/fs.h:21,
                    from drivers/s390/block/dasd_eer.c:12:
   drivers/s390/block/dasd_eer.c: In function 'dasd_eer_write_standard_trigger':
>> drivers/s390/block/dasd_eer.c:312:23: error: 'ts' undeclared (first use in this function)
     ktime_get_real_ts64(&ts);
                          ^
   include/linux/timekeeping.h:160:50: note: in definition of macro 'ktime_get_real_ts64'
    #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
                                                     ^~
   drivers/s390/block/dasd_eer.c:312:23: note: each undeclared identifier is reported only once for each function it appears in
     ktime_get_real_ts64(&ts);
                          ^
   include/linux/timekeeping.h:160:50: note: in definition of macro 'ktime_get_real_ts64'
    #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
                                                     ^~
   drivers/s390/block/dasd_eer.c:298:20: warning: unused variable 'ts64' [-Wunused-variable]
     struct timespec64 ts64;
                       ^~~~

vim +/ts +312 drivers/s390/block/dasd_eer.c

   284	
   285	/*
   286	 * The following function can be used for those triggers that have
   287	 * all necessary data available when the function is called.
   288	 * If the parameter cqr is not NULL, the chain of requests will be searched
   289	 * for valid sense data, and all valid sense data sets will be added to
   290	 * the triggers data.
   291	 */
   292	static void dasd_eer_write_standard_trigger(struct dasd_device *device,
   293						    struct dasd_ccw_req *cqr,
   294						    int trigger)
   295	{
   296		struct dasd_ccw_req *temp_cqr;
   297		int data_size;
   298		struct timespec64 ts64;
   299		struct dasd_eer_header header;
   300		unsigned long flags;
   301		struct eerbuffer *eerb;
   302		char *sense;
   303	
   304		/* go through cqr chain and count the valid sense data sets */
   305		data_size = 0;
   306		for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers)
   307			if (dasd_get_sense(&temp_cqr->irb))
   308				data_size += 32;
   309	
   310		header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
   311		header.trigger = trigger;
 > 312		ktime_get_real_ts64(&ts);
   313		header.tv_sec = ts.tv_sec;
   314		header.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
   315		strncpy(header.busid, dev_name(&device->cdev->dev),
   316			DASD_EER_BUSID_SIZE);
   317	
   318		spin_lock_irqsave(&bufferlock, flags);
   319		list_for_each_entry(eerb, &bufferlist, list) {
   320			dasd_eer_start_record(eerb, header.total_size);
   321			dasd_eer_write_buffer(eerb, (char *) &header, sizeof(header));
   322			for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers) {
   323				sense = dasd_get_sense(&temp_cqr->irb);
   324				if (sense)
   325					dasd_eer_write_buffer(eerb, sense, 32);
   326			}
   327			dasd_eer_write_buffer(eerb, "EOR", 4);
   328		}
   329		spin_unlock_irqrestore(&bufferlock, flags);
   330		wake_up_interruptible(&dasd_eer_read_wait_queue);
   331	}
   332	

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