Rene Herman wrote:
On 16-12-07 16:22, Ingo Molnar wrote:
looks good to me. Could you please also provide three more controls
that i suggested earlier:
- a boot option enabling/disabling the udelay based code
- a .config method of enabling/disabling the udelay based code
- a sysctl to toggle it
if we want to clean this all up we'll need as many controls as possible.
This version does the boot and the .config option but not the sysctl. It
makes for clumsy code and I don't believe it provides for much added
value as soon as you have the boot option. I am moreover not completely
confident about things such as paravirt liking the possibility of the
native_io_delay being changed out from under them at unpredictable times.
Incidentally, I had the thought earlier today that port 0xf0 might be a
suitable delay port. It is used only by the 387-emulating-a-287 hack
for IRQ 13, which Linux doesn't use on 486+.
-hpa
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