Off hand, I concur with you and Linus.  I wasn't involved in the
introduction of TIF_RESTORE_SIGMASK and never thought too much about
it before.  In my recent changes I only considered the issue of
getting it out of _TIF_WORK_MASK et al to free up the low bit, and
didn't contemplate the structure of the implementation beyond that.

I don't think it's "too late" to change anything.  (It's never too
late!  It just might take a while to make a change in a safe and
orderly fashion for all the arch's.)  After my patch series, the
details are fully in the arch's corner.  It should be straightforward
to convert one at a time to use regs->return_register = -ERESTARTRESTOREMASK
to implement set_restore_sigmask() if you want to tackle it.


Thanks,
Roland
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