[PATCH 4.4 172/193] x86/spectre: Check CONFIG_RETPOLINE in command line parser

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Dou Liyang (cherry picked from commit 9471eee9186a46893726e22ebb54cade3f9bc043) The spectre_v2 option 'auto' does not check whether CONFIG_RETPOLINE is enabled. As a

[PATCH 4.4 172/193] x86/spectre: Check CONFIG_RETPOLINE in command line parser

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Dou Liyang (cherry picked from commit 9471eee9186a46893726e22ebb54cade3f9bc043) The spectre_v2 option 'auto' does not check whether CONFIG_RETPOLINE is enabled. As a consequence it fails to