Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 39d178b8346b67b6a71b9f44874b028df185af38 ("mm/swap.c: optimizing __pagevec_lru_add lru_lock")
https://github.com/alexshi/linux.git lrunext


in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------------+------------+------------+
|                                                | 5265bc9109 | 39d178b834 |
+------------------------------------------------+------------+------------+
| boot_successes                                 | 4          | 0          |
| boot_failures                                  | 0          | 2          |
| WARNING:at_include/linux/cpumask.h:#pvlvs_init | 0          | 2          |
| EIP:pvlvs_init                                 | 0          | 2          |
+------------------------------------------------+------------+------------+


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


[   10.013277] WARNING: CPU: 0 PID: 1 at include/linux/cpumask.h:137 pvlvs_init+0x1b/0x9b
[   10.014225] Modules linked in:
[   10.014623] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-next-20200803-00024-g39d178b8346b67 #1
[   10.015746] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   10.016853] EIP: pvlvs_init+0x1b/0x9b
[   10.017309] Code: 0d 25 41 6a 00 e8 aa 54 89 fd 83 c4 18 c9 c3 66 66 66 66 90 55 89 e5 57 bf 20 40 a6 43 56 53 31 db 51 3b 1d 6c ad 78 43 72 02 <0f> 0b 0f a3 1d 64 ac 78 43 72 0e 43 83 fb 08 75 e7 5a 31 c0 5b 5e
[   10.019495] EAX: eedf0090 EBX: 00000002 ECX: eedf0020 EDX: 431d8424
[   10.020300] ESI: 0000000f EDI: 43a64020 EBP: 40337f00 ESP: 40337ef0
[   10.021078] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010246
[   10.021939] CR0: 80050033 CR2: 00000000 CR3: 03a7a000 CR4: 000406b0
[   10.022699] Call Trace:
[   10.023023]  ? page_writeback_init+0x66/0x66
[   10.023512]  ? do_one_initcall+0x5d/0x304
[   10.024052]  ? parse_args+0x1a0/0x290
[   10.024532]  ? do_initcalls+0xc2/0x1ae
[   10.024732]  ? do_initcalls+0x18f/0x1ae
[   10.025246]  ? kernel_init_freeable+0x130/0x15a
[   10.025834]  ? rest_init+0x126/0x126
[   10.026314]  ? kernel_init+0xe/0x10a
[   10.026760]  ? rest_init+0x126/0x126
[   10.027211]  ? ret_from_fork+0x1c/0x28
[   10.027694] ---[ end trace d8aefa5ae0b884bb ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.8.0-next-20200803-00024-g39d178b8346b67 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp