Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an archdoesn't support it

[Christoph Lameter]

On Wed, 6 Dec 2006, Matthew Wilcox wrote:

> And for those of us with only load-and-zero, that's simply:
> 
> #define load_locked(addr) spin_lock(hash(addr)), *addr
> #define store_exclusive(addr, old, new) \
> 			*addr = new, spin_unlock(hash(addr)), 0
> 
> which is also optimal for us.

This means we tolerate the assignment race for SMP that was pointed out 
earlier?

cmpxchg emulation may then also be tolerable just replace the irq 
enable/disable in David's implementation with taking a spin lock?

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