linux-kernel - vmlinux.o: warning: objtool: xen_sched_clock+0x34: call to preempt_schedule_notrace

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Date:   Thu, 25 May 2023 03:20:07 +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,
        Ingo Molnar <mingo@...nel.org>
Subject: vmlinux.o: warning: objtool: xen_sched_clock+0x34: call to
 preempt_schedule_notrace_thunk() leaves .noinstr.text section

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9d646009f65d62d32815f376465a3b92d8d9b046
commit: 8739c6811572b087decd561f96382087402cc343 sched/clock/x86: Mark sched_clock() noinstr
date:   4 months ago
config: x86_64-randconfig-x076-20230524
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8739c6811572b087decd561f96382087402cc343
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 8739c6811572b087decd561f96382087402cc343
        # 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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305250213.DUJDGAqU-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> vmlinux.o: warning: objtool: xen_sched_clock+0x34: call to preempt_schedule_notrace_thunk() leaves .noinstr.text section
>> vmlinux.o: warning: objtool: native_sched_clock+0xda: call to preempt_schedule_notrace_thunk() leaves .noinstr.text section
>> vmlinux.o: warning: objtool: kvm_clock_read+0x1d: call to preempt_schedule_notrace_thunk() leaves .noinstr.text section
   vmlinux.o: warning: objtool: enter_from_user_mode+0xba: call to preempt_count_add() leaves .noinstr.text section
   vmlinux.o: warning: objtool: syscall_enter_from_user_mode+0x108: call to preempt_count_add() leaves .noinstr.text section
   vmlinux.o: warning: objtool: syscall_enter_from_user_mode_prepare+0xdc: call to preempt_count_add() leaves .noinstr.text section
   vmlinux.o: warning: objtool: irqentry_enter_from_user_mode+0xba: call to preempt_count_add() leaves .noinstr.text section


objdump-func vmlinux.o xen_sched_clock:
0000 0000000000001420 <xen_sched_clock>:
0000     1420:	ff 05 00 00 00 00    	incl   0x0(%rip)        # 1426 <xen_sched_clock+0x6>	1422: R_X86_64_PC32	pcpu_hot+0x4
0006     1426:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi	1429: R_X86_64_32S	.rodata+0xe860
000d     142d:	e8 00 00 00 00       	call   1432 <xen_sched_clock+0x12>	142e: R_X86_64_PLT32	__this_cpu_preempt_check-0x4
0012     1432:	48 8b 3d 00 00 00 00 	mov    0x0(%rip),%rdi        # 1439 <xen_sched_clock+0x19>	1435: R_X86_64_PC32	xen_vcpu-0x4
0019     1439:	48 83 c7 20          	add    $0x20,%rdi
001d     143d:	e8 00 00 00 00       	call   1442 <xen_sched_clock+0x22>	143e: R_X86_64_PLT32	pvclock_clocksource_read_nowd-0x4
0022     1442:	48 2b 05 00 00 00 00 	sub    0x0(%rip),%rax        # 1449 <xen_sched_clock+0x29>	1445: R_X86_64_PC32	.data..read_mostly+0x654
0029     1449:	ff 0d 00 00 00 00    	decl   0x0(%rip)        # 144f <xen_sched_clock+0x2f>	144b: R_X86_64_PC32	pcpu_hot+0x4
002f     144f:	74 03                	je     1454 <xen_sched_clock+0x34>
0031     1451:	31 ff                	xor    %edi,%edi
0033     1453:	c3                   	ret
0034     1454:	e8 00 00 00 00       	call   1459 <xen_sched_clock+0x39>	1455: R_X86_64_PLT32	preempt_schedule_notrace_thunk-0x4
0039     1459:	31 ff                	xor    %edi,%edi
003b     145b:	c3                   	ret
003c     145c:	0f 1f 40 00          	nopl   0x0(%rax)

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