tree 548d835c0f13de780678922ba3b3ea4c841e8cd7
parent 5208ba24e7826519d310474dedaed2f84b0ab6a0
author Al Viro <viro@zeniv.linux.org.uk> 1353261010 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1355958459 -0500

new helper: current_user_stack_pointer()

	Cross-architecture equivalent of rdusp(); default is
user_stack_pointer(current_pt_regs()) - that works for almost all
platforms that have usp saved in pt_regs.  The only exception from
that is ia64 - we want memory stack, not the backing store for
register one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>