BGRT doesn't work for me on efi-next

["Môshe van der Sterre" <me-A/3C56C7qwM@public.gmane.org>]

Hello Sai and others,

The change to use early_mem*() instead of early_io*() in 50a0cb56 does 
not work on my machine. Last week I discussed some BGRT changes and I 
created a patch for that, but can't test it on efi-next because of this.

I get this (when booting 50a0cb56, without any of my changes):
[    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

This is the second early_memremap call in efi_bgrt_init triggering 
WARN_ON(nrpages > NR_FIX_BTMAPS). Can you comment on this?

Greetings,
Môshe van der Sterre