On Sun, May 09, 2021 at 03:33:29AM +0800, youling257 wrote: > This patch cause "x86/PAT : surfaceflinger:1440 map pfn RAM range req write-combining for [mem 0x064a2000-0x064a2fff], got write-back" problem. > my 2GB ram Bay trail z3735f tablet runing on android-x86, "i915: fix remap_io_sg to verify the pgprot" cause this problem. So this is the memtype verification added by the patch, meaning that the old code did in fact not call into track_pfn_remap with the right flags. Can the i915 maintainers take a look at making sure the page permissions here make sense?
