linux-kernel - [ammarfaizi2-block:tglx/devel/depthtracking 32/59] vmlinux.o: warning: objtool: ftrace_replace

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Message-ID: <202208070926.VGxv4GTD-lkp@intel.com>
Date:   Sun, 7 Aug 2022 09:06:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...ts.01.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [ammarfaizi2-block:tglx/devel/depthtracking 32/59] vmlinux.o:
 warning: objtool: ftrace_replace_code.cold+0x0: unreachable instruction

tree:   https://github.com/ammarfaizi2/linux-block tglx/devel/depthtracking
head:   b518e558c49324fa002255761d2a7324ba31f7b5
commit: 1da8c357194195fff4d08bf92d75c50ea495c726 [32/59] objtool: Allow STT_NOTYPE -> STT_FUNC+0 tail-calls
config: x86_64-randconfig-a011-20220801 (https://download.01.org/0day-ci/archive/20220807/202208070926.VGxv4GTD-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/1da8c357194195fff4d08bf92d75c50ea495c726
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tglx/devel/depthtracking
        git checkout 1da8c357194195fff4d08bf92d75c50ea495c726
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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 >>):

>> vmlinux.o: warning: objtool: ftrace_replace_code.cold+0x0: unreachable instruction


objdump-func vmlinux.o ftrace_replace_code.cold:
0000 0000000000012fdd <ftrace_replace_code.cold>:
0000    12fdd:	5b                   	pop    %rbx
0001    12fde:	48 89 ee             	mov    %rbp,%rsi
0004    12fe1:	89 c7                	mov    %eax,%edi
0006    12fe3:	5d                   	pop    %rbp
0007    12fe4:	41 5c                	pop    %r12
0009    12fe6:	41 5d                	pop    %r13
000b    12fe8:	41 5e                	pop    %r14
000d    12fea:	e9 9d fd ff ff       	jmp    12d8c <ftrace_bug>

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