[PATCH 4.9 57/92] array_index_nospec: Sanitize speculative array de-references

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Dan Williams (cherry picked from commit f3804203306e098dae9ca51540fcd5eb700d7f40) array_index_nospec() is proposed as a generic mechanism to mitigate against

[PATCH 4.9 57/92] array_index_nospec: Sanitize speculative array de-references

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Dan Williams (cherry picked from commit f3804203306e098dae9ca51540fcd5eb700d7f40) array_index_nospec() is proposed as a generic mechanism to mitigate against Spectre-variant-1 attacks, i.e.