linux-toradex.git/kernel/padata.c, branch imx-android-r10.4

kernel/: convert cpu notifier to return encapsulate errno value

2010-05-27T16:12:48+00:00

By the previous modification, the cpu notifier can return encapsulate
errno value.  This converts the cpu notifiers for kernel/*.c

Signed-off-by: Akinobu Mita 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

padata: Use get_online_cpus/put_online_cpus in padata_free

2010-05-19T03:45:35+00:00

Add get_online_cpus/put_online_cpus to ensure that no cpu goes
offline during the flushing of the padata percpu queues.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Add some code comments

2010-05-19T03:44:27+00:00

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Flush the padata queues actively

2010-05-19T03:43:46+00:00

yield was used to wait until all references of the internal control
structure in use are dropped before it is freed. This patch implements
padata_flush_queues which actively flushes the padata percpu queues
in this case.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Use a timer to handle remaining objects in the reorder queues

2010-05-19T03:43:14+00:00

padata_get_next needs to check whether the next object that
need serialization must be parallel processed by the local cpu.
This check was wrong implemented and returned always true,
so the try_again loop in padata_reorder was never taken. This
can lead to object leaks in some rare cases due to a race that
appears with the trylock in padata_reorder. The try_again loop
was not a good idea after all, because a cpu could take that
loop frequently, so we handle this with a timer instead.

This patch adds a timer to handle the race that appears with
the trylock. If cpu1 queues an object to the reorder queue while
cpu2 holds the pd->lock but left the while loop in padata_reorder
already, cpu2 can't care for this object and cpu1 exits because
it can't get the lock. Usually the next cpu that takes the lock
cares for this object too. We need the timer just if this object
was the last one that arrives to the reorder queues. The timer
function sends it out in this case.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Use get_online_cpus/put_online_cpus

2010-05-03T03:32:12+00:00

This patch puts get_online_cpus/put_online_cpus around the places
we modify the padata cpumask to ensure that no cpu goes offline
during this operation.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Initialize the padata queues only for the used cpus

2010-05-03T03:32:11+00:00

padata_alloc_pd set up queues for all possible cpus.
This patch changes this to set up the queues just for
the used cpus.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: Remove superfluous might_sleep

2010-05-03T03:32:11+00:00

might_sleep() was placed before mutex_lock() in some places.
We remove them because mutex_lock() does might_sleep() too.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

padata: cpu hotplug code should depend on CONFIG_HOTPLUG_CPU

2010-05-03T03:32:11+00:00

This patch makes the padata cpu hotplug code dependend on CONFIG_HOTPLUG_CPU.

Signed-off-by: Steffen Klassert 
Signed-off-by: Herbert Xu

Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

2010-05-03T03:28:58+00:00