Re: Race between vmtruncate and mapped areas?

Daniel McNeil
2003-05-17T00:27:25Z

On Thu, 2003-05-15 at 16:17, Andrea Arcangeli wrote:

> no, the spin_lock only acts as a barrier in one way, not both ways, so
> an smp_something is still needed.
>

Can you explain this more? On a x86, isn't a spin_lock a lock; dec
instruction and the rmb() a lock; addl. I thought x86 instructions
with lock prefix provided a memory barrier.

Just curious,

--
Daniel McNeil <daniel@osdl.org>