Dump /proc/vmalloc, I can see those occupied high memory region.
For example:
0xd99f8000-0xd99fd000 20480 init_mmdc_settings+0x3c/0x410 ioremap
...
0xd9a1e000-0xd9a3b000 118784 gckOS_AllocateMemory+0x44/0x60 pages=28 vmalloc
For those ioremap region, pfn_valid check won't pass, so they shouldn't save in hibernation image, right?
And I can see some vmalloc, I think those will be saved in hibernation image.
To sum those vmalloc regions, I can't get the number calculated in count_highmem_pages.