This patch implements a new freezer subsystem in the control groups
framework. It provides a way to stop and resume execution of all tasks in
a cgroup by writing in the cgroup filesystem.
The freezer subsystem in the container filesystem defines a file named
freezer.state. Writing "FROZEN" to the state file will freeze all tasks
in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in
the cgroup. Reading will return the current state.
* Examples of usage :
# mkdir /containers/freezer
# mount -t cgroup -ofreezer freezer /containers
# mkdir /containers/0
# echo $some_pid > /containers/0/tasks
to get status of the freezer subsystem :
# cat /containers/0/freezer.state
RUNNING
to freeze all tasks in the container :
# echo FROZEN > /containers/0/freezer.state
# cat /containers/0/freezer.state
FREEZING
# cat /containers/0/freezer.state
FROZEN
to unfreeze all tasks in the container :
# echo RUNNING > /containers/0/freezer.state
# cat /containers/0/freezer.state
RUNNING
This is the basic mechanism which should do the right thing for user space
task in a simple scenario.
It's important to note that freezing can be incomplete. In that case we
return EBUSY. This means that some tasks in the cgroup are busy doing
something that prevents us from completely freezing the cgroup at this
time. After EBUSY, the cgroup will remain partially frozen -- reflected
by freezer.state reporting "FREEZING" when read. The state will remain
"FREEZING" until one of these things happens:
1) Userspace cancels the freezing operation by writing "RUNNING" to
the freezer.state file
2) Userspace retries the freezing operation by writing "FROZEN" to
the freezer.state file (writing "FREEZING" is not legal
and returns EIO)
3) The tasks that blocked the cgroup from entering the "FROZEN"
state disappear from the cgroup's set of tasks.
[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: export thaw_process]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add a pin configuration callback for the s3c24xx SPI driver, as there are
several options depending on the channel and the chip in use.
This is needed as the controller may not have been setup by the initial
bootloader and the fact that the SPI controller gets reset over
suspend/resume into slave mode but the GPIO function registers do not.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The SET_PERSONALITY macro is always called with a second argument of 0.
Remove the ibcs argument and the various tests to set the PER_SVR4
personality.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
As policy->governor is already set to CPUFREQ_DEFAULT_GOVERNOR in the
(always built-in) cpufreq core, we do not need to set it in the drivers.
This fixes the sparc64 allmodconfig build failure.
Also, remove a totally useles setting of ->policy in cpufreq-pxa3xx.c.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The ISA IRQ renumbering broke the Viper ISA code in interesting ways.
It originally assumed that ISA interrupt were numbered in the order that
is defined by the CPLD registers. Unfortunately, this is no longer the
case.
Furthermore, the viper_irq_handler() function being a chained IRQ
handler, it must ACK the interrupt by itself, or the handler will be
immediately reentered, with the expected damages.
This fix was made possible thanks to the help of David Raeman, who
provided debug information and tested each version of this patch.
Tested-by: David Raeman <david.raeman@gmail.com>
Signed-off-by: Marc Zyngier <maz@misterjones.org>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Fix build for CM-X2XX with CONFIG_RTC_DRV_V3020 unset:
CC arch/arm/mach-pxa/cm-x270.o
/mnt/sdb1/git/linux-2.6-arm/arch/arm/mach-pxa/cm-x270.c: In function 'cmx270_init':
/mnt/sdb1/git/linux-2.6-arm/arch/arm/mach-pxa/cm-x270.c:338: error: implicit declaration of function 'cmx270_init_rtc'
make[2]: *** [arch/arm/mach-pxa/cm-x270.o] Error 1
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
With the upcoming WDT patches OMAP_WDT_BASE is no longer needed
in devices.c. Revert some earlier omap3 changes to avoid merge
conflicts with the WDT patches.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Recent McBSP patches changed to allocating devices dynamically
and the check for OMAP_MAX_MCBSP_COUNT became unnecessary.
The check for OMAP_MAX_MCBSP_COUNT should have been removed with
the earlier McBSP patches in devices.c but was accidentally left
out.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Some McBSP irq defines were missing that should have been added
with the earlier McBSP patches.
Add the missing McBSP irqs, and a few other missing irqs as
defined in linux-omap tree. Also add a blank line to separate
irq defines from the irq line calculations.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Based on David Brownell's patch for tps65010 and previous work by
Felipe Balbi, this patch finishes converting isp1301_omap to a
new-style i2c driver.
There's definitely room for further drivers cleanups, but these are
out of the scope of this patch.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Make .power and .reset callbacks per camera instead of per host, also move
their invocation to camera drivers.
.arch/arm/mach-pxa/include/mach/camera.h | 2 -
Signed-off-by: Stefan Herbrechtsmeier <hbmeier@hni.uni-paderborn.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Some machines don't have the pullup/down on their reset
pin, so configuring the reset generating pin as input makes
them reset immediately. Fix that by making reset pin direction
configurable.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This patch allows the use of the hardware watchdog in the
Marvell Orion series of ARM SoCs.
Signed-off-by: Sylver Bruneau <sylver.bruneau@googlemail.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
These are changes that have been sitting in linux-omap
and were never sent upstream.
Hopefully, it'll never happen again at least for this
driver.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This patch adds a default config for the OMAP LDP platform.
Signed-off-by: Nishant Kamat <nskamat@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This adds minimal board support for the OMAP3430 LDP development platform.
Signed-off-by: Nishant Kamat <nskamat@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Most ARM machines don't need a special "DMA" memory zone, and
when configured out, the kernel becomes a bit smaller:
| text data bss dec hex filename
|3826182 102384 111700 4040266 3da64a vmlinux
|3823593 101616 111700 4036909 3d992d vmlinux.nodmazone
This is because the system now has only one zone total which effect is
to optimize away many conditionals in page allocation paths.
So let's configure this zone only on machines that need split zones.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Add minimal Beagle board support. Based on earlier patches
by Syed Mohammed Khasim with some fixes from linux-omap tree.
Signed-off-by: Syed Mohammed Khasim <khasim@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Add minimal omap3430 support based on earlier patches from
Syed Mohammed Khasim. Also merge in omap34xx SRAM support
from Karthik Dasu and use consistent naming for sram init
functions.
Also do following changes that make 34xx support usable:
- Remove unused sram.c functions for 34xx
- Rename IRQ_SIR_IRQ to INTCPS_SIR_IRQ and define it locally
in entry-macro.S
- Update mach-omap2/io.c to support 2420, 2430, and 34xx
- Also merge in 34xx GPMC changes to add fields wr_access and
wr_data_mux_bus from Adrian Hunter
- Remove memory initialization call omap2_init_memory() until
until more generic memory initialization patches are posted.
It's OK to rely on bootloader initialization until then.
Signed-off-by: Syed Mohammed, Khasim <khasim@ti.com>
Signed-off-by: Karthik Dasu<karthik-dp@ti.com>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Fix sparse warnings in mach-omap2/irq.c. Fix by defining
intc_bank_write_reg() and intc_bank_read_reg(), and convert INTC module
register access to use them rather than __raw_{read,write}l.
Also clear up some checkpatch warnings involving includes from asm/
rather than linux/.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This patch contains Palm Zire 72 power
management support.
Depends on #5238/1
Signed-off-by: Sergey Lapin <slapin@ossfans.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
desc_handle_irq() was declared as obsolete since long ago.
Replace it with generic_handle_irq()
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Fix two warnings when compiling for the KS8695 processor.
arch/arm/include/asm/dma-mapping.h: In function 'dma_to_virt':
arch/arm/include/asm/dma-mapping.h:40: warning: return makes pointer
from integer without a cast
Section mismatch in reference from the function pcibios_fixup_bus() to
the (unknown reference) .devinit.text:(unknown)
The function pcibios_fixup_bus() references
the (unknown reference) __devinit (unknown).
This is often because pcibios_fixup_bus lacks a __devinit
annotation or the annotation of (unknown) is wrong.
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Replace Macro names that have trailing underscores.
Also use the IOPD() macro instead of a hard-coded bit-shift (for
better readability).
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Bootloader may let McBSP logic running so make sure that block is idle
before requesting IRQs. Also make sure that TX and RX waitqueues are
initialized before request_irq.
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Based on Chandra's earlier patches in linux-omap tree.
Signed-off-by: Chandra Shekhar <x0044955@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Based on Chandra's earlier patches in linux-omap tree.
Note that omap1_mcbsp_check and omap2_mcbsp_check are no longer
needed as there's now omap_mcbsp_check_valid_id() defined.
Also some functions can now be marked __init.
Signed-off-by: Chandra Shekhar <x0044955@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Don't use __init but __devinit to define probe function. A pointer to
omap_mcbsp_probe is passed to the core via platform_driver_register and
so the function must not disappear when the init code is freed. Using
__init and having HOTPLUG=y the following probably oopses:
echo -n omap-mcbsp.1 > /sys/bus/platform/driver/omap-mcbsp/unbind
echo -n omap-mcbsp.1 > /sys/bus/platform/driver/omap-mcbsp/bind
While at it move the remove function to the .devexit.text section.
Signed-off-by: Uwe Kleine-König <ukleinek@strlen.de>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
First move of items out of include/asm-arm/plat-s3c* to their
new homes under arch/arm/plat-s3c/include/plat and
arch/arm/plat-s3c24xx/include/plat directories.
Note, we have to create a dummy arch/arm/plat-s3c/Makefile to
allow us to add arch/arm/plat-s3c/include/plat to the path.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This avoid the pre-mapping of OHCI controller register space, and the
mapping is made only when necessary (OHCI is probed).
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Direct access to pxa27x specific register PSSR in a generic ohci driver
is no good, introduce pxa27x_clear_otgph() and move the implementation
into processor specific code.
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Direct access to USB host controller registers is considered to be not
portable, and is usually a bad sign for poorly abstracted interface.
Introduce .flags and .power_on_delay to "struct pxaohci_platform_data"
so that most platforms don't bother to write their own .init/.exit()
sequences.
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1. DRCMRxx is no longer recommended, use DRCMR(xx) instead, and
pass DRCMR index by "struct resource" if possible
2. DCSRxx, DDADRxx, DSADRxx, DTADRxx, DCMDxx is never used, use
DCSR(), DDADR(), DSADR(), DTADR(), DCMD() instead
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
The initialization of mfp sysdev in pxa2xx_mfp_init() shall really be
avoided when !cpu_is_pxa2xx().
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Russ Dill <russ.dill@gmail.com>
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Matt Helsley