x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations [Linux 4.4.189]

This Linux kernel change "x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations" is included in the Linux 4.4.189 release. This change is authored by Josh Poimboeuf <jpoimboe [at] redhat.com> on Mon Jul 8 11:52:25 2019 -0500. The commit for this change in Linux stable tree is e3d8c97 (patch) which is from upstream commit 18ec54f. […]