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由 Jiri Kosina 提交于
pcpu_alloc() and pcpu_extend_area_map() perform a series of spin_lock_irq()/spin_unlock_irq() calls, which make them unsafe with respect to being called from contexts which have IRQs off. This patch converts the code to perform save/restore of flags instead, making pcpu_alloc() (or __alloc_percpu() respectively) to be called from early kernel startup stage, where IRQs are off. This is needed for proper initialization of per-cpu rq_weight data from sched_init(). tj: added comment explaining why irqsave/restore is used in alloc path. Signed-off-by: NJiri Kosina <jkosina@suse.cz> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NTejun Heo <tj@kernel.org>
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