On Thu, Jan 31, 2008 at 08:50:01AM +0200, Avi Kivity wrote:
> This is surprising. pagefault_disable() is really a preempt_disable(), and
> kvm_read_guest_atomic() should only be called from atomic contexts (with
> preemption already disabled), no?
_spin_lock calls preempt_disable() and that's the result with PREEMPT=n:
#define preempt_disable() do { } while (0)
pagefault_disable always calls into inc_preempt_count() which is why
kmap_atomic uses it instead of preempt_disable().
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