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@xxxxxx> 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@xxxxxxxxxx>
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
