Mapping multiple BARs with PNP (again)

Mapping multiple BARs with PNP (again)

[Laura Abbott]

Hi,

We have some reports of warnings from ioremap about multiple
BARs:

[    2.021722] resource sanity check: requesting [mem 
0xfed10000-0xfed15fff], which spans more than reserved [mem 
0xfed10000-0xfed13fff]
[    2.021723] ------------[ cut here ]------------
[    2.021727] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:183 
__ioremap_caller+0x258/0x2d0()
[    2.021728] Info: mapping multiple BARs. Your kernel is fine.
[    2.021729] Modules linked in:

[    2.021733] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 
3.17.8-300.fc21.x86_64 #1
[    2.021734] Hardware name: Hewlett-Packard HP ProBook 450 G0/1949, 
BIOS 68IRF Ver. F.04 06/24/2013
[    2.021735]  0000000000000000 00000000066e29d6 ffff880149a57b08 
ffffffff81741aea
[    2.021737]  ffff880149a57b50 ffff880149a57b40 ffffffff810970bd 
ffffc90000038000
[    2.021739]  0000000000006000 00000000fed10000 8000000000000573 
ffffc90000038000
[    2.021741] Call Trace:
[    2.021746]  [<ffffffff81741aea>] dump_stack+0x45/0x56
[    2.021749]  [<ffffffff810970bd>] warn_slowpath_common+0x7d/0xa0
[    2.021751]  [<ffffffff8109713c>] warn_slowpath_fmt+0x5c/0x80
[    2.021753]  [<ffffffff8109d2a7>] ? iomem_map_sanity_check+0xc7/0xd0
[    2.021755]  [<ffffffff81061168>] __ioremap_caller+0x258/0x2d0
[    2.021758]  [<ffffffff810611f7>] ioremap_nocache+0x17/0x20
[    2.021761]  [<ffffffff81035d7c>] snb_uncore_imc_init_box+0x7c/0xc0
[    2.021763]  [<ffffffff81038e0c>] uncore_pci_probe+0xcc/0x1a0
[    2.021766]  [<ffffffff813c6ac5>] local_pci_probe+0x45/0xa0
[    2.021769]  [<ffffffff813c7f59>] pci_device_probe+0xf9/0x150
[    2.021772]  [<ffffffff8149a763>] driver_probe_device+0xa3/0x400
[    2.021774]  [<ffffffff8149ab8b>] __driver_attach+0x8b/0x90
[    2.021775]  [<ffffffff8149ab00>] ? __device_attach+0x40/0x40
[    2.021777]  [<ffffffff81498503>] bus_for_each_dev+0x73/0xc0
[    2.021779]  [<ffffffff8149a1fe>] driver_attach+0x1e/0x20
[    2.021781]  [<ffffffff81499dd0>] bus_add_driver+0x180/0x250
[    2.021783]  [<ffffffff81d560fa>] ? uncore_types_init+0x1a1/0x1a1
[    2.021785]  [<ffffffff8149b354>] driver_register+0x64/0xf0
[    2.021787]  [<ffffffff813c638c>] __pci_register_driver+0x4c/0x50
[    2.021789]  [<ffffffff81d5626e>] intel_uncore_init+0x174/0x410
[    2.021791]  [<ffffffff81d560fa>] ? uncore_types_init+0x1a1/0x1a1
[    2.021794]  [<ffffffff81002148>] do_one_initcall+0xd8/0x210
[    2.021796]  [<ffffffff810b4aad>] ? parse_args+0x21d/0x4e0
[    2.021799]  [<ffffffff81d491dd>] kernel_init_freeable+0x1b8/0x254
[    2.021802]  [<ffffffff817373b0>] ? rest_init+0x80/0x80
[    2.021803]  [<ffffffff817373be>] kernel_init+0xe/0xf0
[    2.021807]  [<ffffffff81748bfc>] ret_from_fork+0x7c/0xb0
[    2.021808]  [<ffffffff817373b0>] ? rest_init+0x80/0x80
[    2.021813] ---[ end trace e33d153422839ba3 ]---

This looks like the issue fixed by 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb171f7abb9a 
and I
believe this might have been specifically referenced by
https://lkml.org/lkml/2014/9/30/614 although that never got any
follow up. Does whatever BIOS this is need a workaround? Full
dmesg is at https://bugzilla.redhat.com/attachment.cgi?id=979268

Thanks,
Laura