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

Christoph Lameter
2007-08-14T21:15:50Z

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?