FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git pmem-api
commit 163f9409a57082aed03fbeeb321fbf18bdaf5f42 ("arch: introduce memremap(), replace ioremap_cache()")


+------------------------------------------+------------+------------+
|                                          | dc5d38e432 | 163f9409a5 |
+------------------------------------------+------------+------------+
| boot_successes                           | 18         | 0          |
| boot_failures                            | 3          | 23         |
| BUG:kernel_test_oversize                 | 1          |            |
| BUG:kernel_test_crashed                  | 2          |            |
| WARNING:at_kernel/memremap.c:#memremap() | 0          | 23         |
| backtrace:acpi_load_tables               | 0          | 23         |
| backtrace:acpi_early_init                | 0          | 23         |
+------------------------------------------+------------+------------+


[    0.005013] ACPI: Core revision 20150619
[    0.006041] memremap: acpi_os_map_iomem
[    0.007005] ------------[ cut here ]------------
[    0.008009] WARNING: CPU: 0 PID: 0 at kernel/memremap.c:31 memremap+0xbf/0x130()
[    0.009005] memremap attempted on unknown/mixed range 0x0000000013fe0000 size: 4096
[    0.010004] Modules linked in:
[    0.012007] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.2.0-rc3-00007-g163f940 #4
[    0.013005] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    0.014006]  ffffffff81b80890 ffffffff81c9fd78 ffffffff8189d35e 0000000000000001
[    0.017004]  ffffffff81c9fdc8 ffffffff81c9fdb8 ffffffff8107349a 0000000000000001
[    0.021005]  0000000000001000 0000000000000001 00000000ffffffff 0000000013fe0000
[    0.024004] Call Trace:
[    0.025010]  [<ffffffff8189d35e>] dump_stack+0x4c/0x65
[    0.026009]  [<ffffffff8107349a>] warn_slowpath_common+0x8a/0xc0
[    0.027007]  [<ffffffff81073516>] warn_slowpath_fmt+0x46/0x50
[    0.028010]  [<ffffffff81893da3>] ? acpi_os_map_iomem+0x10f/0x168
[    0.030009]  [<ffffffff811637cf>] memremap+0xbf/0x130
[    0.031008]  [<ffffffff81893da3>] acpi_os_map_iomem+0x10f/0x168
[    0.032008]  [<ffffffff81893e0a>] acpi_os_map_memory+0xe/0x10
[    0.033008]  [<ffffffff814b28f9>] acpi_tb_acquire_table+0x3e/0x6c
[    0.034008]  [<ffffffff814b2a11>] acpi_tb_validate_table+0x4b/0x85
[    0.035008]  [<ffffffff81eab99e>] acpi_load_tables+0x75/0x206
[    0.036007]  [<ffffffff81eaa7fd>] acpi_early_init+0x73/0xd2
[    0.037008]  [<ffffffff81e5ef00>] start_kernel+0x3c6/0x46d
[    0.038008]  [<ffffffff81e5e120>] ? early_idt_handler_array+0x120/0x120
[    0.039008]  [<ffffffff81e5e4d7>] x86_64_start_reservations+0x2a/0x2c
[    0.040007]  [<ffffffff81e5e60f>] x86_64_start_kernel+0x136/0x145
[    0.041011] ---[ end trace 9f242918c164e21c ]---
[    0.042008] ACPI Exception: AE_NO_ACPI_TABLES, While loading namespace from ACPI tables (20150619/tbxfload-80)



Thanks,
Ying Huang