Re: [patch 0/6] lightweight robust futexes: -V4

[Jakub Jelinek]

On Tue, Feb 21, 2006 at 08:26:05AM -0800, Ulrich Drepper wrote:
> > The `len' argument (or really revision of the structure if really needed)
> > can be encoded in the structure, as in:
> > struct robust_list_head {
> >        struct robust_list list;
> >        short robust_list_head_len; /* or robust_list_head_version ? */
> >        short futex_offset;
> >        struct robust_list __user *list_op_pending;
> > };
> > or with long futex_offset, but using say upper 8 bits of the field as
> > version or length.
> 
> I know you want to save SPARC but this kind of overloading I don't
> really like.  If you need special treatment of the futex value make
> this explicit and arch-dependent.

This had nothing to do with SPARC actually, I only wanted to avoid
passing two extra arguments to clone rather than one.  But if you think
CLONE_CHILD_SETROBUST is unnecessary, so be it and the combined
set_tid_robust_address call can have tidptr, robustptr and robustlen
arguments.

	Jakub
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