Re: [uml-devel] Removing call to function pointer in inner loop of copy_from_user()

[Blaisorblade <blaisorblade@yahoo.it>]

On Monday 16 May 2005 20:48, Jeff Dike wrote:
> On Mon, May 16, 2005 at 07:04:13PM +0200, Blaisorblade wrote:
> > I could move maybe move sigsetjmp to kernelspace code;
>
> How are you going to get a definition of jmp_buf in there?
I actually want to include the headers. Not that I would refuse to copy 
verbatim from headers (binary compatibility allows that to work as long we 
use the same host OS / libc combination).
> > however, another
> > possibility would be to use the exception handler tables we've always
> > supported without using them (only drawback is that the code *must* be
> > inlined, and possibly the need for some assembler code, which however is
> > probably avoidable).

> Maybe.  That's worth looking in to.  I've used the setjmp scheme in
> preference to that because it's portable, but maybe we should switch back
> in some places.
Yes, more portable but slightly slower. Also, if you get the compiler to 
inline the code anyway, you only write pseudo-ops in assembler, so that's no 
problem.
-- 
Paolo Giarrusso, aka Blaisorblade
Skype user "PaoloGiarrusso"
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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