James Morse b69e0dc14c 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> [catalin.marinas@arm.com: cherry-picked from mainline for kexec dependency] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2016-06-27 16:24:51 +01:00
..
boot	arm64: dts: drop "arm,amba-bus" in favor of "simple-bus" part 2	2016-06-03 12:13:15 -07:00
configs	Merge git://www.linux-watchdog.org/linux-watchdog	2016-05-25 10:19:17 -07:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2016-03-17 11:22:54 -07:00
include	arm64: smp: Add function to determine if cpus are stuck in the kernel	2016-06-27 16:24:51 +01:00
kernel	arm64: smp: Add function to determine if cpus are stuck in the kernel	2016-06-27 16:24:51 +01:00
kvm	arm64/kvm: use ESR_ELx_EC to extract EC	2016-06-21 17:07:38 +01:00
lib	arm64: kasan: instrument user memory access API	2016-06-21 15:37:18 +01:00
mm	arm64: kill ESR_LNX_EXEC	2016-06-21 17:07:48 +01:00
net	bpf: arm64: remove callee-save registers use for tmp registers	2016-05-17 14:03:33 -04:00
xen	xen/arm: introduce HYPERVISOR_platform_op on arm and arm64	2015-12-21 14:40:56 +00:00
Kconfig	Revert "arm64: Add support ARCH_SUPPORTS_INT128"	2016-06-22 12:00:46 +01:00
Kconfig.debug	arm64: enable CONFIG_SET_MODULE_RONX by default	2016-05-31 14:23:29 +01:00
Kconfig.platforms	ARM: SoC 64-bit changes for v4.7	2016-05-18 12:43:08 -07:00
Makefile	arm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled	2016-06-03 10:57:18 +01:00