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Date:   Mon, 11 Feb 2019 20:38:00 -0200
From:   Alexandre Oliva <>
To:     Tom Li <>
Cc:     James Hogan <>,
        Jiaxun Yang <>,
        Huacai Chen <>,
        Ralf Baechle <>,,
Subject: Re: [RFC] On the Current Troubles of Mainlining Loongson Platform Drivers

On Feb 11, 2019, Tom Li <> wrote:

> What is the current link to your repository? 


I use a different git URL to push stuff, so I wouldn't have noticed if
the above was gone, but I've just tried to git clone form the above and
it seems to remain functional.

> We've just identified and confirmed the source of the shutdown problem a
> few days ago on this mailing list. It's related to a PREEMPT race condition
> in the cpufreq framework that triggers a timing-dependent, probabilistic
> lockup in the i8259 PIC driver. And it was first noticed by Ville Syrjälä
> on a x86 system, my debugging rediscovered his findings.

Oooh, thanks for the links.

>> and, more recently, a very slow system overall, that's been present since
>> 4.20.

> The mainline framebuffer driver doesn't have any hardware drawing, printing
> even a single line on the console is required a full screen redraw via memory-

That doesn't seem to explain even a quiet boot up taking several times
longer than 4.19, and package installation over an ethernet connection
(thus not using the console) also taking several times longer.

Alexandre Oliva, freedom fighter
Be the change, be Free!         FSF Latin America board member
GNU Toolchain Engineer                Free Software Evangelist
Hay que enGNUrecerse, pero sin perder la terGNUra jamás-GNUChe

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