linux-kernel - [linux-stable-rc:linux-5.10.y 6996/7120] arch/x86/kernel/ftrace_64.o: warning: objtool: ftrace

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Message-ID: <202207130344.dwXyDmTk-lkp@intel.com>
Date:   Wed, 13 Jul 2022 03:57:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ben Hutchings <bwh@...nel.org>
Subject: [linux-stable-rc:linux-5.10.y 6996/7120]
 arch/x86/kernel/ftrace_64.o: warning: objtool: ftrace_epilogue()+0x10:
 unreachable instruction

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
head:   ba398a0e54049bb6a1c102245ae84103f103ff2c
commit: 8ca9dceaa17983afec1cc8e1a6e76d6bd142447a [6996/7120] objtool: Assume only ELF functions do sibling calls
config: x86_64-rhel-8.3-syz (https://download.01.org/0day-ci/archive/20220713/202207130344.dwXyDmTk-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=8ca9dceaa17983afec1cc8e1a6e76d6bd142447a
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-5.10.y
        git checkout 8ca9dceaa17983afec1cc8e1a6e76d6bd142447a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/ftrace_64.o: warning: objtool: ftrace_epilogue()+0x10: unreachable instruction


objdump-func vmlinux.o ftrace_epilogue:
0000 000000000008ca70 <ftrace_epilogue>:
0000    8ca70:	e9 00 00 00 00       	jmp    8ca75 <ftrace_epilogue+0x5>	8ca71: R_X86_64_PLT32	ftrace_stub-0x4
0005    8ca75:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp