KAISER: kexec triggers a warning

[Juerg Haefliger]

Loading a kexec kernel using today's linux-tip master with KAISER=y
triggers the following warning:

[   18.054017] ------------[ cut here ]------------
[   18.054024] WARNING: CPU: 0 PID: 1183 at
./arch/x86/include/asm/pgtable_64.h:258 native_set_p4d+0x5f/0x80
[   18.054025] Modules linked in: nls_utf8 isofs ppdev nls_iso8859_1
kvm_intel kvm irqbypass input_leds serio_raw i2c_piix4 parport_pc
parport qemu_fw_cfg mac_hid 9p fscache ib_iser rdma_cm iw_cm ib_cm
ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
9pnet_virtio 9pnet ip_tables x_tables autofs4 btrfs zstd_decompress
zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy
async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath
linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops psmouse virtio_blk virtio_net drm floppy pata_acpi
[   18.054047] CPU: 0 PID: 1183 Comm: kexec Not tainted 4.14.0-kaiser+ #2
[   18.054047] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.10.2-1ubuntu1 04/01/2014
[   18.054048] task: ffff8a53f9d0ab80 task.stack: ffffaba640890000
[   18.054049] RIP: 0010:native_set_p4d+0x5f/0x80
[   18.054050] RSP: 0018:ffffaba640893e20 EFLAGS: 00010246
[   18.054051] RAX: 0000000038ac9063 RBX: 000000003ffda000 RCX:
000000003ffda000
[   18.054051] RDX: ffff8a53fd1f6ff8 RSI: 0000000038ac9063 RDI:
ffff8a53f71ba000
[   18.054051] RBP: 000000003ffda000 R08: 000075abc0000000 R09:
ffff8a53f8ac9000
[   18.054052] R10: 0000000000000003 R11: 000000003ffda000 R12:
ffff8a53f71ba000
[   18.054052] R13: ffffaba640893e78 R14: 0000000000000000 R15:
ffffff8000000000
[   18.054053] FS:  00007f0e95188740(0000) GS:ffff8a53ffc00000(0000)
knlGS:0000000000000000
[   18.054054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.054054] CR2: 00007f0e94bf0fa0 CR3: 000000003c452000 CR4:
00000000000006f0
[   18.054056] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[   18.054056] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[   18.054057] Call Trace:
[   18.054065]  kernel_ident_mapping_init+0x147/0x190
[   18.054069]  machine_kexec_prepare+0xc8/0x490
[   18.054071]  ? trace_clock_x86_tsc+0x10/0x10
[   18.054074]  do_kexec_load+0x1d7/0x2d0
[   18.054079]  SyS_kexec_load+0x84/0xc0
[   18.054083]  entry_SYSCALL_64_fastpath+0x1e/0x81
[   18.054087] RIP: 0033:0x7f0e94c9c9f9
[   18.054087] RSP: 002b:00007ffe0d1a83e8 EFLAGS: 00000246 ORIG_RAX:
00000000000000f6
[   18.054088] RAX: ffffffffffffffda RBX: 000055a491d71240 RCX:
00007f0e94c9c9f9
[   18.054089] RDX: 000055a492aaa570 RSI: 0000000000000003 RDI:
000000003ffd1730
[   18.054089] RBP: 00007ffe0d1a8510 R08: 0000000000000008 R09:
0000000000000001
[   18.054089] R10: 00000000003e0000 R11: 0000000000000246 R12:
0000000000000100
[   18.054090] R13: 0000000000000040 R14: 0000000001b1d820 R15:
000000000007c7e0
[   18.054090] Code: 37 c3 f6 07 04 74 1b 48 89 f8 25 ff 0f 00 00 48 3d
ff 07 00 00 77 18 48 89 f8 80 cc 10 48 89 30 eb dc 83 3d 07 6d ff 00 02
75 d3 <0f> ff eb cf 0f ff eb cb 48 b8 00 00 00 00 00 00 00 80 48 09 c6
[   18.054104] ---[ end trace f206deb161cf8af0 ]---

...Juerg

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