[PATCH 4.2 033/134] arm64: head.S: initialise mdcr_el2 in el2_setup

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Will Deacon commit d10bcd473301888f957ec4b6b12aa3621be78d59 upstream. When entering the kernel at EL2, we fail to initialise the MDCR_EL2 register which controls debug access and PMU

[PATCH 4.2 033/134] arm64: head.S: initialise mdcr_el2 in el2_setup

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Will Deacon commit d10bcd473301888f957ec4b6b12aa3621be78d59 upstream. When entering the kernel at EL2, we fail to initialise the MDCR_EL2 register which controls debug