commit e2c90dd7 upstream.

Môshe reported the following warning triggered on his machine since
commit 50a0cb56 ("x86/efi-bgrt: Fix kernel panic when mapping BGRT
data"),

  [    0.026936] ------------[ cut here ]------------
  [    0.026941] WARNING: CPU: 0 PID: 0 at mm/early_ioremap.c:137 __early_ioremap+0x102/0x1bb()
  [    0.026941] Modules linked in:
  [    0.026944] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-rc1 #2
  [    0.026945] Hardware name: Dell Inc. XPS 13 9343/09K8G1, BIOS A05 07/14/2015
  [    0.026946]  0000000000000000 900f03d5a116524d ffffffff81c03e60 ffffffff813a3fff
  [    0.026948]  0000000000000000 ffffffff81c03e98 ffffffff810a0852 00000000d7b76000
  [    0.026949]  0000000000000000 0000000000000001 0000000000000001 000000000000017c
  [    0.026951] Call Trace:
  [    0.026955]  [<ffffffff813a3fff>] dump_stack+0x44/0x55
  [    0.026958]  [<ffffffff810a0852>] warn_slowpath_common+0x82/0xc0
  [    0.026959]  [<ffffffff810a099a>] warn_slowpath_null+0x1a/0x20
  [    0.026961]  [<ffffffff81d8c395>] __early_ioremap+0x102/0x1bb
  [    0.026962]  [<ffffffff81d8c602>] early_memremap+0x13/0x15
  [    0.026964]  [<ffffffff81d78361>] efi_bgrt_init+0x162/0x1ad
  [    0.026966]  [<ffffffff81d778ec>] efi_late_init+0x9/0xb
  [    0.026968]  [<ffffffff81d58ff5>] start_kernel+0x46f/0x49f
  [    0.026970]  [<ffffffff81d58120>] ? early_idt_handler_array+0x120/0x120
  [    0.026972]  [<ffffffff81d58339>] x86_64_start_reservations+0x2a/0x2c
  [    0.026974]  [<ffffffff81d58485>] x86_64_start_kernel+0x14a/0x16d
  [    0.026977] ---[ end trace f9b3812eb8e24c58 ]---
  [    0.026978] efi_bgrt: Ignoring BGRT: failed to map image memory

early_memremap() has an upper limit on the size of mapping it can
handle which is ~200KB. Clearly the BGRT image on Môshe's machine is
much larger than that.

There's actually no reason to restrict ourselves to using the early_*
version of memremap() - the ACPI BGRT driver is invoked late enough in
boot that we can use the standard version, with the benefit that the
late version allows mappings of arbitrary size.
Reported-by: Môshe van der Sterre <me@moshe.nl>
Tested-by: Môshe van der Sterre <me@moshe.nl>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1450707172-12561-1-git-send-email-matt@codeblueprint.co.ukSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>