On Tue, 2018-08-14 at 19:18 +0200, Greg Kroah-Hartman wrote: > 4.4-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Dan Williams <dan.j.willi...@intel.com> > > commit 87744ab3832b83ba71b931f86f9cfdb000d07da5 upstream > > vm_insert_mixed() unlike vm_insert_pfn_prot() and vmf_insert_pfn_pmd(), > fails to check the pgprot_t it uses for the mapping against the one > recorded in the memtype tracking tree. Add the missing call to > track_pfn_insert() to preclude cases where incompatible aliased mappings > are established for a given physical address range. [...]
This apparently breaks a number of DRM drivers. The upstream fixes are: 8ef4227615e1 x86/io: add interface to reserve io memtype for a resource range. (v1.1) 7cf321d118a8 drm/drivers: add support for using the arch wc mapping API. They appear to apply cleanly to 4.4-stable. They are included in 4.9 so no other stable branch needs them. Ben. -- Ben Hutchings, Software Developer Codethink Ltd https://www.codethink.co.uk/ Dale House, 35 Dale Street Manchester, M1 2HF, United Kingdom
