Comment 1 for bug 1790620

Already applied:
* Fix up non-directory creation in SGID directories
  for bug #1779923 / CVE-2018-13405
* "x86/cpufeature: Cleanup get_cpu_cap()" for CVE-2018-3639.
  Currently applied version has one additional change for
  KVM.
* "x86/cpufeature: Carve out X86_FEATURE_*" for bug #1397880
* "x86/cpufeature: Update cpufeaure macros"
  Those were already correctly added with a previous backport.

Already applied but picked in modified form to remove delta:
* "x86/cpufeature: Move some of the scattered feature bits
  to x86_capability" for CVE-2018-3639 (x86).
  The changes were verified to be technically the same. Only
  added a spacing newline that could make future backports
  simpler.

Modified:
* "x86/headers: Don't include asm/processor.h in asm/atomic.h"
  Because we picked up "x86/cpufeature: Carve out X86_FEATURE_*"
  the 3rd hunk modifying the lib can be dropped.
* "x86/cpufeature, x86/mm/pkeys: Add protection keys related
  CPUID definitions"
  We already have extended the feature words to 19, so all those
  changes could be dropped.
* "x86/cpu: Add detection of AMD RAS Capabilities"
  Again dropped modifications to extend the number of feature
  words.
* "86/cpufeature, x86/mm/pkeys: Fix broken compile-time disabling
  of pkeys"
  Only needed to fix one part as the other parts were correctly
  added before.