drivers/mtd/chips/cfi_util.o: warning: objtool: cfi_qry_present() falls through to next function cfi_merge_status()

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f313b43be461f157755a57c1156f86abe10588de
commit: ed7d40bc67b8353c677b38c6cdddcdc310c0f452 tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount
date:   7 weeks ago
config: x86_64-randconfig-g0-08111005 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout ed7d40bc67b8353c677b38c6cdddcdc310c0f452
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> drivers/mtd/chips/cfi_util.o: warning: objtool: cfi_qry_present() falls through to next function cfi_merge_status()
--
>> drivers/mtd/chips/cfi_cmdset_0002.o: warning: objtool: chip_good() falls through to next function fixup_use_fwh_lock()

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