[PATCH 4.4 12/78] x86/mm, sched/core: Turn off IRQs in switch_mm()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Andy Lutomirski commit 078194f8e9fe3cf54c8fd8bded48a1db5bd8eb8a upstream. Potential races between switch_mm() and TLB-flush or LDT-flush IPIs could be very messy. AFAICT the

[PATCH 4.4 12/78] x86/mm, sched/core: Turn off IRQs in switch_mm()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Andy Lutomirski commit 078194f8e9fe3cf54c8fd8bded48a1db5bd8eb8a upstream. Potential races between switch_mm() and TLB-flush or LDT-flush IPIs could be very messy. AFAICT the code is currently