linux-kernel - RE: remove the last set_fs() in common code, and remove it for x86 and powerpc v3

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Date:   Sat, 5 Sep 2020 10:13:51 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christophe Leroy' <christophe.leroy@...roup.eu>,
        'Alexey Dobriyan' <adobriyan@...il.com>,
        Ingo Molnar <mingo@...nel.org>
CC:     "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Kees Cook <keescook@...omium.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Luis Chamberlain" <mcgrof@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>
Subject: RE: remove the last set_fs() in common code, and remove it for x86
 and powerpc v3

From: Christophe Leroy
> Sent: 05 September 2020 08:16
> 
> Le 04/09/2020 à 23:01, David Laight a écrit :
> > From: Alexey Dobriyan
> >> Sent: 04 September 2020 18:58
...
> > What is this strange %fs register you are talking about.
> > Figure 2-4 only has CS, DS, SS and ES.
> >
> 
> Intel added registers FS and GS in the i386

I know, I've got both the 'iAPX 286 Programmer's Reference Manual'
and the '80386 Programmer's Reference Manual' on my shelf.

I don't have the 8088 book though - which I used in 1982.

The old books are a lot easier to read if, for instance,
you are trying to work out how to back and forth to real mode
to do bios calls.

	David

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