linux-kernel - vmlinux.o: warning: objtool: xenpv_exc_double

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Message-ID: <202303271446.1FSJkyat-lkp@intel.com>
Date:   Mon, 27 Mar 2023 14:17:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: vmlinux.o: warning: objtool: xenpv_exc_double_fault+0xd: unreachable
 instruction

Hi Peter,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   197b6b60ae7bc51dd0814953c562833143b292aa
commit: 443ed4c302fff6a26af980300463343a7adc9ee8 objtool: mem*() are not uaccess safe
date:   6 weeks ago
config: x86_64-randconfig-r035-20230327 (https://download.01.org/0day-ci/archive/20230327/202303271446.1FSJkyat-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=443ed4c302fff6a26af980300463343a7adc9ee8
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 443ed4c302fff6a26af980300463343a7adc9ee8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        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>
| Link: https://lore.kernel.org/oe-kbuild-all/202303271446.1FSJkyat-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> vmlinux.o: warning: objtool: xenpv_exc_double_fault+0xd: unreachable instruction


objdump-func vmlinux.o xenpv_exc_double_fault:
0000 0000000000001680 <xenpv_exc_double_fault>:
0000     1680:	f3 0f 1e fa          	endbr64
0004     1684:	55                   	push   %rbp
0005     1685:	48 89 e5             	mov    %rsp,%rbp
0008     1688:	e8 00 00 00 00       	call   168d <xenpv_exc_double_fault+0xd>	1689: R_X86_64_PLT32	exc_double_fault-0x4
000d     168d:	5d                   	pop    %rbp
000e     168e:	c3                   	ret
000f     168f:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
001a     169a:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
0025     16a5:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
0030     16b0:	66 66 2e 0f 1f 84 00 00 00 00 00 	data16 cs nopw 0x0(%rax,%rax,1)
003b     16bb:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests