tree 9f1215cc8f7f0e1c36b03882b2926cc26ccfa5ff
parent ede6f5aea054d3fb67c78857f7abdee602302043
author Arjan van de Ven <arjan@linux.intel.com> 1231346746 -0800
committer Arjan van de Ven <arjan@linux.intel.com> 1231346746 -0800

async: Asynchronous function calls to speed up kernel boot

Right now, most of the kernel boot is strictly synchronous, such that
various hardware delays are done sequentially.

In order to make the kernel boot faster, this patch introduces
infrastructure to allow doing some of the initialization steps
asynchronously, which will hide significant portions of the hardware delays
in practice.

In order to not change device order and other similar observables, this
patch does NOT do full parallel initialization.

Rather, it operates more in the way an out of order CPU does; the work may
be done out of order and asynchronous, but the observable effects
(instruction retiring for the CPU) are still done in the original sequence.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>