James Morse 5c492c3f52 arm64: smp: Add function to determine if cpus are stuck in the kernel ... kernel/smp.c has a fancy counter that keeps track of the number of CPUs it marked as not-present and left in cpu_park_loop(). If there are any CPUs spinning in here, features like kexec or hibernate may release them by overwriting this memory. This problem also occurs on machines using spin-tables to release secondary cores. After commit 44dbcc93ab ("arm64: Fix behavior of maxcpus=N") we bring all known cpus into the secondary holding pen, meaning this memory can't be re-used by kexec or hibernate. Add a function cpus_are_stuck_in_kernel() to determine if either of these cases have occurred. Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2016-06-22 15:48:09 +01:00
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asm	arm64: smp: Add function to determine if cpus are stuck in the kernel	2016-06-22 15:48:09 +01:00
uapi/asm	asm-generic: Drop renameat syscall from default list	2016-05-05 00:42:21 +02:00