Denis wrote:
It struck me that kernel actually can figure out whether it's okay
to sleep or not by looking at combination of (flags & __GFP_WAIT)
and ((in_atomic() || irqs_disabled()) as it already does this for
might_sleep() barfing:
Wrong:
- the kernel cannot figure out if a thread owns a normal spinlock():
in_atomic detects spin_lock_bh(), irqs_disabled spin_lock_irq(). But
spin_lock has no global state.
- dito for get_cpu()/put_cpu users.
- dito for rcu users, or anyone else that uses preempt_disable() for
whatever purpose
--
Manfred
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