--- zzzz-none-000/linux-5.4.213/drivers/video/fbdev/core/fb_defio.c 2022-09-15 10:04:56.000000000 +0000 +++ miami-7690-761/linux-5.4.213/drivers/video/fbdev/core/fb_defio.c 2024-05-29 11:20:02.000000000 +0000 @@ -168,6 +168,10 @@ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; if (!(info->flags & FBINFO_VIRTFB)) vma->vm_flags |= VM_IO; + + if (info->flags & FBINFO_DMAFB) + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + vma->vm_private_data = info; return 0; }