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Subject: Re: remove the last set_fs() in common code, and remove it for x86
 and powerpc v3
To: David Laight <David.Laight@ACULAB.COM>,
 'Alexey Dobriyan' <adobriyan@gmail.com>, Ingo Molnar <mingo@kernel.org>
References: <20200903142242.925828-1-hch@lst.de>
 <20200904060024.GA2779810@gmail.com>
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From: Christophe Leroy <christophe.leroy@csgroup.eu>
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Date: Sat, 5 Sep 2020 09:16:06 +0200
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Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
 Kees Cook <keescook@chromium.org>,
 Linus Torvalds <torvalds@linux-foundation.org>,
 "x86@kernel.org" <x86@kernel.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 Luis Chamberlain <mcgrof@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>,
 "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
 "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
 Christoph Hellwig <hch@lst.de>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>



Le 04/09/2020 à 23:01, David Laight a écrit :
> From: Alexey Dobriyan
>> Sent: 04 September 2020 18:58
>>
>> On Fri, Sep 04, 2020 at 08:00:24AM +0200, Ingo Molnar wrote:
>>> * Christoph Hellwig <hch@lst.de> wrote:
>>>> this series removes the last set_fs() used to force a kernel address
>>>> space for the uaccess code in the kernel read/write/splice code, and then
>>>> stops implementing the address space overrides entirely for x86 and
>>>> powerpc.
>>>
>>> Cool! For the x86 bits:
>>>
>>>    Acked-by: Ingo Molnar <mingo@kernel.org>
>>
>> set_fs() is older than some kernel hackers!
>>
>> 	$ cd linux-0.11/
>> 	$ find . -type f -name '*.h' | xargs grep -e set_fs -w -n -A3
>> 	./include/asm/segment.h:61:extern inline void set_fs(unsigned long val)
>> 	./include/asm/segment.h-62-{
>> 	./include/asm/segment.h-63-     __asm__("mov %0,%%fs"::"a" ((unsigned short) val));
>> 	./include/asm/segment.h-64-}
> 
> 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

Christophe