Messages in this thread | | | From | David Laight <> | Subject | RE: remove the last set_fs() in common code, and remove it for x86 and powerpc v3 | Date | Fri, 4 Sep 2020 21:01:06 +0000 |
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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.
David
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