Re: out-of-line x86 "put_user()" implementation

[Ingo Molnar]

* Linus Torvalds <torvalds@xxxxxxxx> wrote:

> I no longer use x86 as my main machine, so this patch is totally
> untested.  I've compiled it to see that things look somewhat sane, but
> that doesn't mean much. If I forgot some register or screwed something
> else up, this will result in a totally nonworking kernel, but I
> thought that maybe somebody else would be interested in looking at
> whether this (a) works, (b) migth even shrink the kernel and (c) might
> make us able to DTRT wrt the page table following crud (old i386 cores
> may be hard to find these days, so maybe people don't care).

boots fine and shrinks the image size quite noticeably:

  [Nr] Name     Type        Addr     Off    Size
  [ 1] .text    PROGBITS    c0100000 001000 2771a9   [vmlinux-orig]
  [ 1] .text    PROGBITS    c0100000 001000 2742dd   [vmlinux-patched]

that's 11980 bytes off a 2585001 bytes .text, a 0.5% size reduction.
This patch we want ...

	Ingo
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