regulator: max77686: make max77686 less chatty. we can use dynamic_debug later if we need these debug messages

Signed-off-by: Andrei F <luxneb@gmail.com>
mach-exynos: cpuidle-exynos4: set logging default to disabled
arm: smp: Wrap backtrace IPI with irq_enter/exit
lib/checksum.c: optimize do_csum a bit Reduce the number of variables modified by the loop in do_csum() by 1, which seems like a good idea. On Nios II (a RISC CPU with 3-operand instruction set) it reduces the loop from 7 to 6 instructions, including the conditional branch.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>