Hi Harry,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.0-rc4 next-20190222]
[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/Harry-Pan/PM-sleep-refactor-the-filesystems-sync-to-reduce-duplication/20190225-025843
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 8.2.0-11) 8.2.0
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
        GCC_VERSION=8.2.0 make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: kernel/power/main.o: in function `ksys_sync_helper':
>> main.c:(.text+0x150): undefined reference to `__aeabi_ldivmod'
>> arm-linux-gnueabi-ld: main.c:(.text+0x16c): undefined reference to `__aeabi_ldivmod'

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