[PATCH 3.16 41/76] x86/retpoline: Fill RSB on context switch for affected CPUs

3.16.56-rc1 review patch. If anyone has any objections, please let me know. -- From: David Woodhouse commit c995efd5a740d9cbafbf58bde4973e8b50b4d761 upstream. On context switch from a shallow call stack to a deeper one, as the CPU does 'ret' up the deeper

[PATCH 3.16 41/76] x86/retpoline: Fill RSB on context switch for affected CPUs

3.16.56-rc1 review patch. If anyone has any objections, please let me know. -- From: David Woodhouse commit c995efd5a740d9cbafbf58bde4973e8b50b4d761 upstream. On context switch from a shallow call stack to a deeper one, as the CPU does 'ret' up the deeper side it may