It looks fine to me, except that I decided to play chicken as far as the
give_sigsegv update of sa_handler is concerned.

Arun, I hope I got the ia32 emulation parts right, but you may want to
double-check.

The patch seems to work fine as far as I have tested.  I'm seeing some
oddity in context-switch overhead and pipe latency as reported by LMbench,
but I suspect that's due to another change that happened somewhere between
2.6.5-rc1 and Linus' bk tree as of this morning.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>