linux-kernel - Re: [OpenRISC] [PATCH] openrisc: remove CONFIG_SET

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Date:   Sun, 6 Feb 2022 19:04:06 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Jonas Bonn <jonas@...thpole.se>, Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Openrisc <openrisc@...ts.librecores.org>
Subject: Re: [OpenRISC] [PATCH] openrisc: remove CONFIG_SET_FS

H Geert,

Thanks for looking after it.

On Sun, Feb 06, 2022 at 10:42:46AM +0100, Geert Uytterhoeven wrote:
> Hi Stafford,
> 
> Thanks for your patch!
> 
> On Sun, Feb 6, 2022 at 2:37 AM Stafford Horne <shorne@...il.com> wrote:
> > Remove the address space override API set_fs() used for User Mode Linux.
> 
> Note: this doesn't have anything to do with UML...

Yes, I agree for UML, I was actually following the text from Christoph's patch
here:

    https://lore.kernel.org/lkml/20211215165612.554426-1-hch@lst.de/T/#m439e32b3ecc8404424d2d8115d49fbf27c6393e9

The wording 'User Mode Linux' was perculiar. Maybe I should remove the
misleading text and just say:

    Remove the address space override API set_fs().

-Stafford

> > User address space is now limited to TASK_SIZE.
> >
> > To support this we implement and wire in __get_kernel_nofault and
> > __set_kernel_nofault.
> >
> > The function user_addr_max is removed as there is a default definition
> > provided when CONFIG_SET_FS is not used.
> >
> > Signed-off-by: Stafford Horne <shorne@...il.com>