From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>,
"open list:MIPS" <linux-mips@vger.kernel.org>,
Fuxin Zhang <zhangfx@lemote.com>,
Zhangjin Wu <wuzhangjin@gmail.com>
Subject: Re: [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel
Date: Fri, 28 Aug 2020 13:12:57 +0200 [thread overview]
Message-ID: <20200828111257.GA2912@alpha.franken.de> (raw)
In-Reply-To: <CAAhV-H7ZrkLjpVSENR93XhA=YHROShavAhydPPdYeuGNBzOnyA@mail.gmail.com>
On Fri, Aug 28, 2020 at 05:52:05PM +0800, Huacai Chen wrote:
> Hi, Thomas,
>
> On Fri, Aug 28, 2020 at 5:34 PM Thomas Bogendoerfer
> <tsbogend@alpha.franken.de> wrote:
> > if it is enabled at that point, it was already enabled in kernel.
> In kernel FPU may be enabled temporarily, and it seems a preemptible
> kernel may enable FPU for a new process (maybe I'm wrong, this is a
> bit complex).
no you are completly right. We need to clear CU1 in this place otherwise
a orphan cpu warning will trigger. It's enabled, if the current thread owns
it, but the newly created thread doesn't.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
next prev parent reply other threads:[~2020-08-28 11:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-02 4:55 [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel Huacai Chen
2020-05-02 4:55 ` [PATCH V3 2/2] MIPS: Loongson-3: Calculate ra properly when unwinding the stack Huacai Chen
2020-05-06 5:29 ` [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel Jiaxun Yang
2020-08-01 7:59 ` Huacai Chen
2020-08-05 12:10 ` Thomas Bogendoerfer
2020-08-05 13:51 ` Jiaxun Yang
2020-08-06 1:15 ` Huacai Chen
2020-08-07 13:13 ` Thomas Bogendoerfer
2020-08-07 13:25 ` Jiaxun Yang
2020-08-07 13:36 ` Thomas Bogendoerfer
2020-08-09 14:53 ` Jiaxun Yang
2020-08-10 14:12 ` Thomas Bogendoerfer
2020-08-11 2:16 ` Jiaxun Yang
2020-08-11 6:45 ` Huacai Chen
2020-08-11 12:06 ` Thomas Bogendoerfer
2020-08-14 9:44 ` Huacai Chen
2020-08-14 13:16 ` Jiaxun Yang
2020-08-26 12:46 ` Thomas Bogendoerfer
2020-08-27 3:48 ` Huacai Chen
2020-08-28 8:42 ` Thomas Bogendoerfer
2020-08-28 9:21 ` Huacai Chen
2020-08-28 9:33 ` Thomas Bogendoerfer
2020-08-28 9:52 ` Huacai Chen
2020-08-28 11:12 ` Thomas Bogendoerfer [this message]
2020-09-02 6:54 ` Huacai Chen
2020-09-03 8:43 ` Thomas Bogendoerfer
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