Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

[Christoph Lameter]

On Tue, 14 Aug 2007, Andi Kleen wrote:

> > Hmmmm... The spinlock is its own flag.
> 
> Yes, but it's not CPU local. Taking the spinlock from another CPU's
> interrupt handler is perfectly safe, just not from the local CPU.
> If you use the spinlock as flag you would need to lock out everybody.

So every spinlock would have an array of chars sized to NR_CPUS and set 
the flag when the lock is taken?

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