Mainline kernel can work on Loongson-3A1000/3B1500, but unstable on Loongson-3A2000/3A3000, and there is something wrong about display. I only have Loongson-3A2000/3A3000 now, and some of needed patches are already available on patchwork.
Huacai
------------------ Original ------------------
From: "Paul Burton"<paul.burton@xxxxxxxx>;
Date: Sat, Jun 16, 2018 00:31 AM
To: "陈华才"<chenhc@xxxxxxxxxx>;
Cc: "Ralf Baechle"<ralf@xxxxxxxxxxxxxx>; "James Hogan"<james.hogan@xxxxxxxx>; "Steven J . Hill"<Steven.Hill@xxxxxxxxxx>; "linux-mips"<linux-mips@xxxxxxxxxxxxxx>; "Fuxin Zhang"<zhangfx@xxxxxxxxxx>; "wuzhangjin"<wuzhangjin@xxxxxxxxx>; "stable"<stable@xxxxxxxxxxxxxxx>;
Subject: Re: [PATCH] MIPS: Fix arch_trigger_cpumask_backtrace()
Hi Huacai,
On Fri, Jun 15, 2018 at 12:30:35PM +0800, 陈华才 wrote:
> I can't test your branch...... Because now the mainline kernel lacks
> too many features needed by Loongson-3.
Interesting - so the mainline Loongson-3 code doesn't actually work? How
much is missing for it to be functional?
> By the way, Your approach is based on NMI but I don't think NMI is
> always available on each MIPS board.
It isn't using NMIs at all - the nmi_trigger_cpumask_backtrace()
function has NMI in its name, sure, but it just invokes a callback to
interrupt other CPUs & we can implement that using regular old IPIs.
This is the same way arch/arm does it, so it's not unprecedented &
allows us to share the common code.
It would be ideal to use NMIs where possible in future, but that can
come later for platforms where they're available.
Thanks,
Paul
