From: Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Schmitz <schmitzmic@gmail.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Christoph Hellwig <hch@lst.de>,
Greg Ungerer <gerg@linux-m68k.org>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
uClinux development list <uclinux-dev@uclinux.org>
Subject: Re: [PATCH] m68knommu: remove set_fs()
Date: Thu, 8 Jul 2021 06:17:37 +0200 [thread overview]
Message-ID: <20210708041737.GB17410@lst.de> (raw)
In-Reply-To: <CAHk-=wjPcjY0TUNeh1pwC2s4xk=MPJGu_66+ywJ3SbmrEW5Yxg@mail.gmail.com>
On Wed, Jul 07, 2021 at 09:14:29PM -0700, Linus Torvalds wrote:
> Except now that I think about it, I worry about getting scheduled away
> *between* the instruction that sets SFC and the one that sets DFC. And
> then switch_to() will save just SFC to the thread-struct. And then
> restore the (new thread) SFC value to _both_ SFC and DFC.
arch/m68k/Kconfig: select ARCH_NO_PREEMPT if !COLDFIRE
So only coldfire can support kernel preemption, and coldfire never uses
SFC/DFC.
next prev parent reply other threads:[~2021-07-08 4:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-05 5:57 RFC: stop implementing set_fs for m68knommu Christoph Hellwig
2021-07-05 5:57 ` [PATCH] m68knommu: remove set_fs() Christoph Hellwig
2021-07-05 8:44 ` Geert Uytterhoeven
2021-07-05 8:56 ` Christoph Hellwig
2021-07-05 11:33 ` Geert Uytterhoeven
2021-07-05 11:51 ` Christoph Hellwig
2021-07-05 20:39 ` Linus Torvalds
2021-07-06 4:13 ` Christoph Hellwig
2021-07-06 18:36 ` Linus Torvalds
2021-07-07 14:25 ` Christoph Hellwig
2021-07-07 17:41 ` Linus Torvalds
2021-07-08 1:39 ` Michael Schmitz
2021-07-08 3:40 ` Michael Schmitz
2021-07-08 4:14 ` Linus Torvalds
2021-07-08 4:17 ` Christoph Hellwig [this message]
2021-07-08 6:33 ` Michael Schmitz
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