Re: i486 emu in mainline?

[Rene Rebe]

Hi,

On: Sun, 23 May 2004 01:40:59 +0200,
    Christoph Hellwig <hch@xxxxxx> wrote:
> These days gcc uses i486+ only instruction by default in libstdc++ so
> most modern distros wouldn't work on i386 cpus anymore.  To make it work
> again Debian merged Willy Tarreau's patch to trap those and emulate them
> on real i386 cpus.  The patch is extremely non-invasive and would
> certainly be usefull for mainline.  Any reason not to include it?

Oh cool! Given the fact with libstdc++ and sparc32 kernel also always
contain code to emulatre the mul/div instructions missing in the v7
hardware (just foudn this SIGILL trap by accident recently ..) the
comment might be a bit too strict. Maybe something like written in the
MATH_EMULATION config:

"If you are not sure, say Y; apart from resulting in a 66 KB bigger
kernel, it won't hurt."

Sincerely yours,
  René Rebe
    - ROCK Linux stable release maintainer

--  
René Rebe - Europe/Germany/Berlin
  rene@xxxxxxxxxxxxx rene@xxxxxxxxxxxxxxxxxxxxxxx
http://www.rocklinux.org http://www.rocklinux-consulting.de

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