signals: Use hrtimer for sigtimedwait()
We've converted most timeout related syscalls to hrtimers, but sigtimedwait() did not get this treatment. Convert it so we get a reasonable accuracy and remove the user space exposure to the timer wheel properties. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Chris Mason <clm@fb.com> Cc: Cyril Hrubis <chrubis@suse.cz> Cc: George Spelvin <linux@sciencehorizons.net> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Len Brown <lenb@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160704094341.787164909@linutronix.deSigned-off-by: NIngo Molnar <mingo@kernel.org>
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