Re: kmalloc without GFP_xxx?

[Manfred Spraul]

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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