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SubjectRe: [patch] fastcall-2.3.32-B6, SYSENTER/SYSEXIT support
Richard Gooch wrote:
>
> I'm happy with the page mapping idea, but what concerns me is that we
> can end up with a kernel which has a fair bit of code data embedded in
> it, due to the increasing number of syscall instructions. Even if it's
> contained in __init sections, it still bloats the kernel image. This
> is a particular problem with embedded systems. Config options will
> help here, but we have too many of those already.

hmm, i can't see this taking more that a few hundred bytes. it's not
like every syscall would need a special entry point, and every one
of them would be in a dozen versions.
What was proposed so far wouldn't involve more than having a pair of
very simple ("lea 4(%esp),%ebp;sysenter"-type) sequences, possibly in
two or three versions, plus a small routine for really special cases
(gettimeofday).


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