fs/ext4/inode.o: warning: objtool: mpage_release_unused_pages()+0x22c: unreachable instruction

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   37187df45af7d28d27b5c130c23f407ca9dbefa2
commit: 0887a7ebc97770c7870abf3075a2e8cd502a7f52 ubsan: add trap instrumentation option
date:   6 months ago
config: x86_64-randconfig-m001-20201015 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0887a7ebc97770c7870abf3075a2e8cd502a7f52
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 0887a7ebc97770c7870abf3075a2e8cd502a7f52
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> fs/ext4/inode.o: warning: objtool: mpage_release_unused_pages()+0x22c: unreachable instruction
--
>> block/blk-flush.o: warning: objtool: blk_flush_complete_seq()+0x6f: unreachable instruction
--
>> drivers/virtio/virtio_ring.o: warning: objtool: virtqueue_add_split()+0x3a: unreachable instruction
--
>> drivers/ide/ide-probe.o: warning: objtool: ide_host_remove()+0x5f: unreachable instruction
--
>> net/core/flow_dissector.o: warning: objtool: skb_flow_dissector_init()+0x80: unreachable instruction
--
>> drivers/usb/host/isp116x-hcd.o: warning: objtool: postproc_atl_queue()+0x6c: unreachable instruction

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip