This is the previous stateful sysrq patch, plus a 'sysrq-sticky' proc
entry, which defaults to off, that controls whether the stateful mode
will be used or not.

This reworked patch is against 2.4.11-pre2.

++ 02/10/01 10:18 -0400 - Crutcher Dunnavant:
> ++ 02/10/01 10:48 +0200 - willy tarreau:
> > > I'd suggest either making this behaviour optional,
> > or making it
> > > so that hitting alt-sysrq twice, without any other
> > keys being
> > > pressed makes the next key stick.
> > 
> > I agree with you that there's a risk. Mike Harris had
> > written a
> > patch for 2.2 which did something similar, but
> > slightly better 
> > IMO since it avoids risks of mis-press, handles
> > correctly
> > broken keyboards and keeps compatible with the
> > existing 
> > method. Basically, it allows the user to press Alt,
> > then SysRQ,
> > release SysRQ then press the desired key, and later
> > release
> > Alt. In fact, it only resets the "magic-key-mode" flag
> > after Alt
> > has been released, and doesn't bother when SysRq is
> > released.
> 
> But this would require that alt be pressed. This is not acceptable on
> exactly the sort of boards which require this patch.
> 
> I will look at adding a 'sysrq-sticky' entry to proc, which will do the
> obvious thing. I think that this should address everyone's concerns.
> 
> -- 
> Crutcher        <crutcher@datastacks.com>
> GCS d--- s+:>+:- a-- C++++$ UL++++$ L+++$>++++ !E PS+++ PE Y+ PGP+>++++
>     R-(+++) !tv(+++) b+(++++) G+ e>++++ h+>++ r* y+>*$
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-- 
Crutcher        <crutcher@datastacks.com>
GCS d--- s+:>+:- a-- C++++$ UL++++$ L+++$>++++ !E PS+++ PE Y+ PGP+>++++
    R-(+++) !tv(+++) b+(++++) G+ e>++++ h+>++ r* y+>*$