linux-kernel - Re: [PATCH] rtc: fix overflow and incorrect calculation in rtc_time64_to

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Message-ID: <201512040917.SKHzdiDn%fengguang.wu@intel.com>
Date:	Fri, 4 Dec 2015 09:41:58 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	kbuild-all@...org, a.zummo@...ertech.it,
	alexandre.belloni@...e-electrons.com, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH] rtc: fix overflow and incorrect calculation in
 rtc_time64_to_tm

[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
Hi Sasha,

[auto build test ERROR on abelloni/rtc-next]
[also build test ERROR on v4.4-rc3 next-20151202]

url:    https://github.com/0day-ci/linux/commits/Sasha-Levin/rtc-fix-overflow-and-incorrect-calculation-in-rtc_time64_to_tm/20151204-081508
base:   https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: arm-prima2_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `rtc_time64_to_tm':
>> drivers/rtc/rtc-lib.c:64: undefined reference to `__aeabi_ldivmod'
   drivers/rtc/rtc-lib.c:66: undefined reference to `__aeabi_ldivmod'

vim +64 drivers/rtc/rtc-lib.c

c58411e9 Alessandro Zummo 2006-03-27  58  
c2c11ae4 pang.xunlei      2014-11-18  59  	/* time must be positive */
c2c11ae4 pang.xunlei      2014-11-18  60  	days = div_s64(time, 86400);
ee9fd0e8 Sasha Levin      2015-12-03  61  	secs = time - days * 86400;
c58411e9 Alessandro Zummo 2006-03-27  62  
c58411e9 Alessandro Zummo 2006-03-27  63  	/* day of the week, 1970-01-01 was a Thursday */
c58411e9 Alessandro Zummo 2006-03-27 @64  	tm->tm_wday = (days + 4) % 7;
c58411e9 Alessandro Zummo 2006-03-27  65  
c58411e9 Alessandro Zummo 2006-03-27  66  	year = 1970 + days / 365;
c58411e9 Alessandro Zummo 2006-03-27  67  	days -= (year - 1970) * 365

:::::: The code at line 64 was first introduced by commit
:::::: c58411e95d7f5062dedd1a3064af4d359da1e633 [PATCH] RTC Subsystem: library functions

:::::: TO: Alessandro Zummo <a.zummo@...ertech.it>
:::::: CC: Linus Torvalds <torvalds@...osdl.org>

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