mmc: decrease wakelock timeout
ARM: smpboot: Enable interrupts after marking CPU online/active

With the note that we really should clean up the cpu hotplug code,
there's far too much code duplication in the arch/ implementations. The
below patch looks like it might actually work.

Thomas, others, please have a very close look because I might have
thought too hard and missed the obvious :-)

---
Subject: hotplug, sched: cpu_active vs __cpu_up
Stepan found:

CPU0		CPUn

_cpu_up()
  __cpu_up()

		boostrap()
		  notify_cpu_starting()
		  set_cpu_online()
		  while (!cpu_active())
		    cpu_relax()

<PREEMPT-out>

smp_call_function(.wait=1)
  /* we find cpu_online() is true */
  arch_send_call_function_ipi_mask()
  /* wait-forever-more */
<PREEMPT-in>
		  local_irq_enable()

  cpu_notify(CPU_ONLINE)
    sched_cpu_active()
      set_cpu_active()

Now the purpose of cpu_active is mostly with bringing down a cpu, where
we mark it !active to avoid the load-balancer from moving tasks to it
while we tear down the cpu. This is required because we only update the
sched_domain tree after we brought the cpu-down. And this is needed so
that some tasks can still run while we bring it down, we just don't want
new tasks to appear.

On cpu-up however the sched_domain tree doesn't yet include the new cpu,
so its invisible to the load-balancer, regardless of the active state.
So instead of setting the active state after we boot the new cpu (and
consequently having to wait for it before enabling interrupts) set the
cpu active before we set it online and avoid the whole mess.

Reported-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
backported to linux 3.0.x by faux123

Conflicts:
	arch/arm/kernel/smp.c

Ported to vanquish by Bytecode
ARM: SMP: use a timing out completion for cpu hotplug

Rather than open-coding the jiffy-based wait, and polling for the
secondary CPU to come online, use a completion instead.  This
removes the need to poll, instead we will be notified when the
secondary CPU has initialized.

Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
printk: Don't allow cpu to get console lock during hotplugging

The flush of the console takes unnecessary time during the cpu
hotplug up operation.  It can delay the rcu synchronize_sched
operation, which in turn delays the hotplug operation. The flush
delays rcu synchronize_sched during scheduling domain creation
by up to 100 ms by interrupting the move to a quiescent state.
This change delays the flush of the console to later in the
notification chain of cpu_online. At the point in the cpu_up
operation where the flush now occurs, other tasks can already
be scheduled on the cpu that just came up.

Signed-off-by: Maya Spivak <mspivak@codeaurora.org>
(cherry picked from commit c7108258d7e44b56842f8215e31d7310f86febaa)

Change-Id: I2986071a5b05760e05d86da2f33ea2a9fe882469
Signed-off-by: Swetha Basineni <sbasin@codeaurora.org>
cpu-hotplug: Add the function 'cpu_hotplug_inprogress'

Allows a caller to detect whether a cpu hotplug operation
is in progress. This is useful for optimizing code paths
based on this condition.

Signed-off-by: Maya Spivak <mspivak@codeaurora.org>
(cherry picked from commit 9f6cabec8fd0d0cb95084d18ee7cddbcf922ac2d)

Change-Id: I2eae7fbb819e3a776dba77a061eb89f30ac3176d
Signed-off-by: Swetha Basineni <sbasin@codeaurora.org>
staging: Add Snappy compression support to zram (alt)

Google's Snappy data compression library is a faster alternative to LZO,
optimized for x86-64. On compressible input it compresses ~2.5x faster than LZO
and decompresses ~1.5-2x faster than LZO. On incompressible input, it skips the
input at 100x faster than LZO and decompresses ~4x faster than LZO.
It is released under BSD license.
This is a kernel port from user space C++ code.
The current intended use is with zram (see next patch in series).

Signed-off-by: Zeev Tarantov <zeev.tarantov@gmail.com>
Modified for use with patched Linux-Next ZRAM drivers by faux123

Conflicts:
	drivers/staging/zram/zram_drv.c
Revert "staging: Add Snappy compression support to zram (alt)"

This reverts commit bc71a63d607d442c2cc0e2f0527d276b78780f6d.
zram: Simplify zram disk resizing interface

Also remove unnecessary messages.

Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Reviewed-by: Jerome Marchand <jmarchan@redhat.com>
switch do_fsync() to fget_light()

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

Conflicts:
	fs/sync.c
Revert "switch do_fsync() to fget_light()"

This reverts commit a9c96c697a96843bff9177f0743adf8513c1dfff.
Revert "sync.c: add a module_param to fsync() calls. fsync is still disabled by default but users will have the choice of having a faster build or a safer build (for data integrity). Props for simms for busting my ass off with this one :)"

This reverts commit cbbdcbf8f0c86e56ba4359c5115f9da5a525a912.
switch do_fsync() to fget_light()

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