Re: atomic copy_from_user?

[Rob Love]

On Mon, 2003-12-22 at 16:22, Joe Korty wrote:

> I am guessing that nowdays even when preemption is disabled one can
> find preempt_count still being used somewhere.  Otherwise it would be
> better to replace all uses of inc_preempt_count() with
> preempt_disable() and dec_preempt_count() with preempt_enable().

Right.  So why did you make this patch? :)

inc_preempt_count() and dec_preempt_count() are for use when you
_absolutely_ must manage the preemption counter, regardless of whether
or not kernel preemption is enabled.

They are used for things like atomic kmaps.

	Rob Love


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/