[PATCH v4] um: Enable preemption in UML

[Richard Weinberger]

----- Ursprüngliche Mail -----
> Von: "anton ivanov" <anton.ivanov at cambridgegreys.com>
> An: "richard" <richard at nod.at>
> CC: "linux-um" <linux-um at lists.infradead.org>, "Johannes Berg" <johannes at sipsolutions.net>
> Gesendet: Donnerstag, 21. September 2023 23:41:16
> Betreff: Re: [PATCH v4] um: Enable preemption in UML

> On 21/09/2023 22:02, Richard Weinberger wrote:
>> ----- Ursprüngliche Mail -----
>>> Von: "anton ivanov" <anton.ivanov at cambridgegreys.com>
>>> An: "linux-um" <linux-um at lists.infradead.org>
>>> CC: "Johannes Berg" <johannes at sipsolutions.net>, "richard" <richard at nod.at>,
>>> "anton ivanov"
>>> <anton.ivanov at cambridgegreys.com>
>>> Gesendet: Donnerstag, 21. September 2023 17:55:22
>>> Betreff: [PATCH v4] um: Enable preemption in UML
>>> From: Anton Ivanov <anton.ivanov at cambridgegreys.com>
>>>
>>> Preemption requires saving/restoring FPU state. This patch
>>> adds support for it using GCC intrinsics.
>> This patch triggers here the following splat:
> 
> Ack. I will look into it tomorrow.

Thx!
I had a brief look, UML's init_IRQ() seems to return now with interrupts enabled.
Dunno why, I need some sleep now.

> 
> There will be places where it will bomb out. F.E. I am chasing one is
> triggered by the NFS server (it may be the same as in this trace - it
> happens around the end of the initial setup).
> 
> All in all it looks better than I expected.

True that! :-)

Thanks,
//richard