slub: zero page to fix boot crashes

Latest mmotm rarely boots if SLUB is enabled: earlyprintk=vga shows
it crashing with various backtraces.  The memset has now been removed
from kmem_cache_open(), so kmem_cache_init() needs to zero its page.
This gets SLUB booting reliably again.

Signed-off-by: Hugh Dickins <hughd@google.com>
irq: Set CPU affinity as soon as the irq thread is created

In an embedded target where IRQ affinities are pre-configured during
boot-time (and not modified through /proc/irq/../smp_affinity) during
run-time, the extra latency due to irq_thread_check_affinity can be
avoided during processing of the first interrupt with this patch.
Thoughts?

backported from Linux 3.5+ by faux123
cpufreq: fix interactive bug during hotplug

When a new cpu is added and if does not enter idle
for long, the interactive timer is not started and hence
the cpu remains at lowest frequecny, despite the system
load. This impacts mainly benchmarks. Starting a timer
at governor start to handle low frequency.

Change-Id: I8ac9705b9f166a95715c985efacd2ae8ef387cb7
Signed-off-by: Narayanan Gopalakrishnan <nargop@codeaurora.org>