Sudeep Holla d55c5f28af arm64: smp: disable hotplug on trusted OS resident CPU ... The trusted OS may reject CPU_OFF calls to its resident CPU, so we must avoid issuing those. We never migrate a Trusted OS and we already take care to prevent CPU_OFF PSCI call. However, this is not reflected explicitly to the userspace. Any user can attempt to hotplug trusted OS resident CPU. The entire motion of going through the various state transitions in the CPU hotplug state machine gets executed and the PSCI layer finally refuses to make CPU_OFF call. This results is unnecessary unwinding of CPU hotplug state machine in the kernel. Instead we can mark the trusted OS resident CPU as not available for hotplug, so that the user attempt or request to do the same will get immediately rejected. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Will Deacon <will@kernel.org>		2019-08-15 11:12:03 +01:00
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asm	arm64: smp: disable hotplug on trusted OS resident CPU	2019-08-15 11:12:03 +01:00
uapi/asm	treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers	2019-07-25 11:05:10 +02:00