Add machine check recovery for instruction fetch

Part 1 fixes an oversight in the existing code that didn't show up while I was testing the data recovery case (because I never tried injecting an error into a clean LRU data page ... only to dirty pages where "memory_failure()" says we have to SIGBUS the process).

Part simply adds the right entries to the severity table so that we will recognise instruction fetch faults.

Tony Luck (2):
x86/mce: Only restart instruction after machine check recovery if it
is safe
x86/mce: Add instruction recovery signatures to mce-severity table

 arch/x86/kernel/cpu/mcheck/mce-severity.c |   10 ++++++++++
 arch/x86/kernel/cpu/mcheck/mce.c          |    9 ++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

1.7.9.rc2.1.g69204