Messages in this thread | | | From | Linus Torvalds <> | Date | Fri, 4 Sep 2020 11:42:42 -0700 | Subject | Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v3 |
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On Fri, Sep 4, 2020 at 10:58 AM Alexey Dobriyan <adobriyan@gmail.com> wrote: > > 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
Oh, it's older than that. It was there (as set_fs) in 0.10, and may even predate that. But sadly, I don't have tar-balls for 0.02 and 0.03, so can't check.
The actual use of %fs as the user space segment is already there in 0.01, but there was no 'set_fs()'. That was a simpler and more direct time, and "get_fs()" looked like this back then:
#define _fs() ({ \ register unsigned short __res; \ __asm__("mov %%fs,%%ax":"=a" (__res):); \ __res;})
and all the setting was basically part of the kernel entry asm and. Lovely.
Linus
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