[PATCH v3 1/9] video/aperture: Add a helper to detect if an aperture contains firmware FB

[Bjorn Helgaas]

On Wed, Jul 12, 2023 at 12:43:02AM +0800, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng at loongson.cn>
> 
> This patch adds the aperture_contain_firmware_fb() function to do the
> determination. Unfortunately, due to the fact that the apertures list
> will be freed dynamically, the location and size information of the
> firmware FB will be lost after dedicated drivers call
> aperture_remove_conflicting_devices(),
> aperture_remove_conflicting_pci_devices() or
> aperture_remove_all_conflicting_devices() functions

> We solve this problem by introducing two static variables that record the
> firmware framebuffer's start addrness and end addrness. It assumes that the
> system has only one active firmware framebuffer driver at a time. We don't
> use the global structure screen_info here, because PCI resources may get
> reallocated (the VRAM BAR could be moved) during the kernel boot stage.

s/addrness/address/ (twice)