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Peter Zijlstra 5fbd036b55 sched: Cleanup cpu_active madness ... Stepan found: CPU0 CPUn _cpu_up() __cpu_up() boostrap() notify_cpu_starting() set_cpu_online() while (!cpu_active()) cpu_relax() <PREEMPT-out> smp_call_function(.wait=1) /* we find cpu_online() is true */ arch_send_call_function_ipi_mask() /* wait-forever-more */ <PREEMPT-in> local_irq_enable() cpu_notify(CPU_ONLINE) sched_cpu_active() set_cpu_active() Now the purpose of cpu_active is mostly with bringing down a cpu, where we mark it !active to avoid the load-balancer from moving tasks to it while we tear down the cpu. This is required because we only update the sched_domain tree after we brought the cpu-down. And this is needed so that some tasks can still run while we bring it down, we just don't want new tasks to appear. On cpu-up however the sched_domain tree doesn't yet include the new cpu, so its invisible to the load-balancer, regardless of the active state. So instead of setting the active state after we boot the new cpu (and consequently having to wait for it before enabling interrupts) set the cpu active before we set it online and avoid the whole mess. Reported-by: Stepan Moskovchenko <stepanm@codeaurora.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1323965362.18942.71.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>		13 years ago
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Makefile	Hexagon: Add configuration and makefiles for the Hexagon architecture.	13 years ago
asm-offsets.c	Hexagon: Add configuration and makefiles for the Hexagon architecture.	13 years ago
dma.c	Hexagon: Provide DMA implementation	13 years ago
head.S	Hexagon: Add startup code	13 years ago
hexagon_ksyms.c	Hexagon: Export ksyms defined in assembly files.	13 years ago
init_task.c	Hexagon: Add init_task and process functions	13 years ago
irq_cpu.c	Hexagon: Add interrupts	13 years ago
kgdb.c	Hexagon: kgdb support files	13 years ago
module.c	Hexagon: Support dynamic module loading.	13 years ago
process.c	Hexagon: Add init_task and process functions	13 years ago
ptrace.c	Hexagon: Add ptrace support	13 years ago
reset.c	Hexagon: Add startup code	13 years ago
setup.c	Hexagon: Add startup code	13 years ago
signal.c	Hexagon: Add signal functions	13 years ago
smp.c	sched: Cleanup cpu_active madness	13 years ago
stacktrace.c	Hexagon: Add basic stacktrace functionality for Hexagon architecture.	13 years ago
syscall.c	…
syscalltab.c	…
time.c	Hexagon: Add time and timer functions	13 years ago
topology.c	Hexagon: Add SMP support	13 years ago
trampoline.S	Hexagon: Add signal functions	13 years ago
traps.c	Hexagon: Provide basic debugging and system trap support.	13 years ago
vdso.c	Hexagon: Add signal functions	13 years ago
vm_entry.S	…
vm_events.c	…
vm_init_segtable.S	…
vm_ops.S	…
vm_switch.S	…
vm_vectors.S	…
vmlinux.lds.S	Hexagon: Add configuration and makefiles for the Hexagon architecture.	13 years ago