linux-toradex.git/kernel/fork.c, branch imx-android-13.4.1

Merge remote branch 'fsl-linux-sdk/imx_3.0.35' into imx_3.0.35_android

2012-07-25T08:54:33+00:00

Conflicts:
	arch/arm/configs/imx6_defconfig
	arch/arm/configs/imx6_updater_defconfig
	arch/arm/configs/imx6s_defconfig
	arch/arm/include/asm/dma-mapping.h
	arch/arm/kernel/smp.c
	arch/arm/mach-mx6/Kconfig
	arch/arm/mach-mx6/board-mx6dl_arm2.h
	arch/arm/mach-mx6/board-mx6dl_sabresd.h
	arch/arm/mach-mx6/board-mx6q_arm2.c
	arch/arm/mach-mx6/board-mx6q_arm2.h
	arch/arm/mach-mx6/board-mx6q_sabreauto.c
	arch/arm/mach-mx6/board-mx6q_sabreauto.h
	arch/arm/mach-mx6/board-mx6q_sabrelite.c
	arch/arm/mach-mx6/board-mx6q_sabresd.c
	arch/arm/mach-mx6/board-mx6q_sabresd.h
	arch/arm/mach-mx6/board-mx6sl_arm2.c
	arch/arm/mach-mx6/board-mx6sl_arm2.h
	arch/arm/mach-mx6/board-mx6solo_sabreauto.h
	arch/arm/mach-mx6/bus_freq.c
	arch/arm/mach-mx6/clock.c
	arch/arm/mach-mx6/clock_mx6sl.c
	arch/arm/mach-mx6/cpu.c
	arch/arm/mach-mx6/crm_regs.h
	arch/arm/mach-mx6/devices-imx6q.h
	arch/arm/mach-mx6/devices.c
	arch/arm/mach-mx6/mx6_anatop_regulator.c
	arch/arm/mach-mx6/pcie.c
	arch/arm/mach-mx6/system.c
	arch/arm/mm/dma-mapping.c
	arch/arm/plat-mxc/devices/Makefile
	arch/arm/plat-mxc/devices/platform-imx-dcp.c
	arch/arm/plat-mxc/devices/platform-imx-ocotp.c
	arch/arm/plat-mxc/devices/platform-imx-rngb.c
	arch/arm/plat-mxc/devices/platform-mxc_hdmi.c
	arch/arm/plat-mxc/include/mach/devices-common.h
	arch/arm/plat-mxc/include/mach/esdhc.h
	arch/arm/plat-mxc/include/mach/iomux-mx6dl.h
	arch/arm/plat-mxc/include/mach/iomux-mx6q.h
	arch/arm/plat-mxc/include/mach/memory.h
	arch/arm/plat-mxc/include/mach/mx6.h
	arch/arm/plat-mxc/include/mach/mxc_edid.h
	arch/arm/plat-mxc/include/mach/mxc_hdmi.h
	arch/arm/plat-mxc/system.c
	drivers/Kconfig
	drivers/char/hw_random/fsl-rngc.c
	drivers/cpufreq/Makefile
	drivers/cpufreq/cpufreq_interactive.c
	drivers/crypto/Kconfig
	drivers/crypto/caam/caamalg.c
	drivers/crypto/caam/compat.h
	drivers/crypto/caam/ctrl.c
	drivers/crypto/caam/desc_constr.h
	drivers/crypto/caam/intern.h
	drivers/crypto/dcp.c
	drivers/dma/pch_dma.c
	drivers/input/keyboard/gpio_keys.c
	drivers/input/touchscreen/egalax_ts.c
	drivers/input/touchscreen/max11801_ts.c
	drivers/media/video/mxc/capture/Kconfig
	drivers/media/video/mxc/capture/adv7180.c
	drivers/media/video/mxc/capture/ipu_csi_enc.c
	drivers/media/video/mxc/capture/ipu_prp_vf_sdc.c
	drivers/media/video/mxc/capture/ipu_prp_vf_sdc_bg.c
	drivers/media/video/mxc/capture/mxc_v4l2_capture.c
	drivers/media/video/mxc/capture/ov5640_mipi.c
	drivers/media/video/mxc/output/mxc_vout.c
	drivers/misc/Kconfig
	drivers/misc/Makefile
	drivers/mmc/card/block.c
	drivers/mmc/core/mmc.c
	drivers/mmc/host/mmci.c
	drivers/mmc/host/sdhci-esdhc-imx.c
	drivers/mmc/host/sdhci.c
	drivers/mmc/host/sdhci.h
	drivers/mxc/Kconfig
	drivers/mxc/Makefile
	drivers/mxc/asrc/mxc_asrc.c
	drivers/mxc/gpu-viv/arch/XAQ2/hal/kernel/gc_hal_kernel_context.c
	drivers/mxc/gpu-viv/arch/XAQ2/hal/kernel/gc_hal_kernel_hardware.c
	drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel.c
	drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel.h
	drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_command.c
	drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_event.c
	drivers/mxc/gpu-viv/hal/kernel/inc/gc_hal.h
	drivers/mxc/gpu-viv/hal/kernel/inc/gc_hal_base.h
	drivers/mxc/gpu-viv/hal/kernel/inc/gc_hal_options.h
	drivers/mxc/gpu-viv/hal/os/linux/kernel/gc_hal_kernel_os.c
	drivers/mxc/ipu3/ipu_device.c
	drivers/mxc/vpu/mxc_vpu.c
	drivers/net/fec.c
	drivers/net/wireless/Makefile
	drivers/power/sabresd_battery.c
	drivers/regulator/core.c
	drivers/tty/serial/imx.c
	drivers/usb/core/hub.c
	drivers/usb/gadget/arcotg_udc.c
	drivers/usb/gadget/fsl_updater.c
	drivers/usb/gadget/inode.c
	drivers/usb/host/ehci-hub.c
	drivers/video/mxc/ldb.c
	drivers/video/mxc/mipi_dsi.c
	drivers/video/mxc/mxc_dispdrv.c
	drivers/video/mxc/mxc_dispdrv.h
	drivers/video/mxc/mxc_edid.c
	drivers/video/mxc/mxc_elcdif_fb.c
	drivers/video/mxc/mxc_ipuv3_fb.c
	drivers/video/mxc/mxc_spdc_fb.c
	drivers/video/mxc_hdmi.c
	drivers/watchdog/imx2_wdt.c
	fs/proc/base.c
	include/linux/mmc/host.h
	include/linux/mmc/sdhci.h
	include/linux/mxc_v4l2.h
	kernel/power/main.c
	sound/soc/codecs/mxc_hdmi.c
	sound/soc/codecs/mxc_spdif.c
	sound/soc/codecs/wm8962.c
	sound/soc/imx/Kconfig
	sound/soc/imx/Makefile
	sound/soc/imx/imx-cs42888.c
	sound/soc/imx/imx-esai.c
	sound/soc/imx/imx-wm8958.c
	sound/soc/imx/imx-wm8962.c

plist: Remove the need to supply locks to plist heads

2012-07-20T05:23:22+00:00

This was legacy code brought over from the RT tree and
is no longer necessary.

Signed-off-by: Dima Zavin 
Acked-by: Thomas Gleixner 
Cc: Daniel Walker 
Cc: Steven Rostedt 
Cc: Peter Zijlstra 
Cc: Andi Kleen 
Cc: Lai Jiangshan 
Link: http://lkml.kernel.org/r/1310084879-10351-2-git-send-email-dima@android.com
Signed-off-by: Ingo Molnar

namespaces, pid_ns: fix leakage on fork() failure

2012-05-21T16:40:01+00:00

commit 5e2bf0142231194d36fdc9596b36a261ed2b9fe7 upstream.

Fork() failure post namespace creation for a child cloned with
CLONE_NEWPID leaks pid_namespace/mnt_cache due to proc being mounted
during creation, but not unmounted during cleanup.  Call
pid_ns_release_proc() during cleanup.

Signed-off-by: Mike Galbraith 
Acked-by: Oleg Nesterov 
Reviewed-by: "Eric W. Biederman" 
Cc: Pavel Emelyanov 
Cc: Cyrill Gorcunov 
Cc: Louis Rilling 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

epoll: introduce POLLFREE to flush ->signalfd_wqh before kfree()

2012-03-01T00:34:34+00:00

commit d80e731ecab420ddcb79ee9d0ac427acbc187b4b upstream.

This patch is intentionally incomplete to simplify the review.
It ignores ep_unregister_pollwait() which plays with the same wqh.
See the next change.

epoll assumes that the EPOLL_CTL_ADD'ed file controls everything
f_op->poll() needs. In particular it assumes that the wait queue
can't go away until eventpoll_release(). This is not true in case
of signalfd, the task which does EPOLL_CTL_ADD uses its ->sighand
which is not connected to the file.

This patch adds the special event, POLLFREE, currently only for
epoll. It expects that init_poll_funcptr()'ed hook should do the
necessary cleanup. Perhaps it should be defined as EPOLLFREE in
eventpoll.

__cleanup_sighand() is changed to do wake_up_poll(POLLFREE) if
->signalfd_wqh is not empty, we add the new signalfd_cleanup()
helper.

ep_poll_callback(POLLFREE) simply does list_del_init(task_list).
This make this poll entry inconsistent, but we don't care. If you
share epoll fd which contains our sigfd with another process you
should blame yourself. signalfd is "really special". I simply do
not know how we can define the "right" semantics if it used with
epoll.

The main problem is, epoll calls signalfd_poll() once to establish
the connection with the wait queue, after that signalfd_poll(NULL)
returns the different/inconsistent results depending on who does
EPOLL_CTL_MOD/signalfd_read/etc. IOW: apart from sigmask, signalfd
has nothing to do with the file, it works with the current thread.

In short: this patch is the hack which tries to fix the symptoms.
It also assumes that nobody can take tasklist_lock under epoll
locks, this seems to be true.

Note:

	- we do not have wake_up_all_poll() but wake_up_poll()
	  is fine, poll/epoll doesn't use WQ_FLAG_EXCLUSIVE.

	- signalfd_cleanup() uses POLLHUP along with POLLFREE,
	  we need a couple of simple changes in eventpoll.c to
	  make sure it can't be "lost".

Reported-by: Maxime Bizon 
Signed-off-by: Oleg Nesterov 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

plist: Remove the need to supply locks to plist heads

2011-07-08T21:15:44+00:00

This was legacy code brought over from the RT tree and
is no longer necessary.

Signed-off-by: Dima Zavin 
Acked-by: Thomas Gleixner 
Cc: Daniel Walker 
Cc: Steven Rostedt 
Cc: Peter Zijlstra 
Cc: Andi Kleen 
Cc: Lai Jiangshan 
Link: http://lkml.kernel.org/r/1310084879-10351-2-git-send-email-dima@android.com
Signed-off-by: Ingo Molnar

sched: Add a generic notifier when a task struct is about to be freed

2011-06-14T16:09:31+00:00

This patch adds a notifier which can be used by subsystems that may
be interested in when a task has completely died and is about to
have it's last resource freed.

  The Android lowmemory killer uses this to determine when a task
it has killed has finally given up its goods.

Signed-off-by: San Mehat

mm: Fix boot crash in mm_alloc()

2011-05-29T18:32:28+00:00

Thomas Gleixner reports that we now have a boot crash triggered by
CONFIG_CPUMASK_OFFSTACK=y:

    BUG: unable to handle kernel NULL pointer dereference at   (null)
    IP: [] find_next_bit+0x55/0xb0
    Call Trace:
     [] cpumask_any_but+0x2a/0x70
     [] flush_tlb_mm+0x2b/0x80
     [] pud_populate+0x35/0x50
     [] pgd_alloc+0x9a/0xf0
     [] mm_init+0xec/0x120
     [] mm_alloc+0x53/0xd0

which was introduced by commit de03c72cfce5 ("mm: convert
mm->cpu_vm_cpumask into cpumask_var_t"), and is due to wrong ordering of
mm_init() vs mm_init_cpumask

Thomas wrote a patch to just fix the ordering of initialization, but I
hate the new double allocation in the fork path, so I ended up instead
doing some more radical surgery to clean it all up.

Reported-by: Thomas Gleixner 
Reported-by: Ingo Molnar 
Cc: KOSAKI Motohiro 
Cc: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: extract exe_file handling from procfs

2011-05-27T00:12:36+00:00

Setup and cleanup of mm_struct->exe_file is currently done in fs/proc/.
This was because exe_file was needed only for /proc//exe.  Since we
will need the exe_file functionality also for core dumps (so core name can
contain full binary path), built this functionality always into the
kernel.

To achieve that move that out of proc FS to the kernel/ where in fact it
should belong.  By doing that we can make dup_mm_exe_file static.  Also we
can drop linux/proc_fs.h inclusion in fs/exec.c and kernel/fork.c.

Signed-off-by: Jiri Slaby 
Cc: Alexander Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cgroup: remove the ns_cgroup

2011-05-27T00:12:34+00:00

The ns_cgroup is an annoying cgroup at the namespace / cgroup frontier and
leads to some problems:

  * cgroup creation is out-of-control
  * cgroup name can conflict when pids are looping
  * it is not possible to have a single process handling a lot of
    namespaces without falling in a exponential creation time
  * we may want to create a namespace without creating a cgroup

  The ns_cgroup was replaced by a compatibility flag 'clone_children',
  where a newly created cgroup will copy the parent cgroup values.
  The userspace has to manually create a cgroup and add a task to
  the 'tasks' file.

This patch removes the ns_cgroup as suggested in the following thread:

https://lists.linux-foundation.org/pipermail/containers/2009-June/018616.html

The 'cgroup_clone' function is removed because it is no longer used.

This is a userspace-visible change.  Commit 45531757b45c ("cgroup: notify
ns_cgroup deprecated") (merged into 2.6.27) caused the kernel to emit a
printk warning users that the feature is planned for removal.  Since that
time we have heard from XXX users who were affected by this.

Signed-off-by: Daniel Lezcano 
Signed-off-by: Serge E. Hallyn 
Cc: Eric W. Biederman 
Cc: Jamal Hadi Salim 
Reviewed-by: Li Zefan 
Acked-by: Paul Menage 
Acked-by: Matt Helsley 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cgroups: read-write lock CLONE_THREAD forking per threadgroup

2011-05-27T00:12:34+00:00

Adds functionality to read/write lock CLONE_THREAD fork()ing per-threadgroup

Add an rwsem that lives in a threadgroup's signal_struct that's taken for
reading in the fork path, under CONFIG_CGROUPS.  If another part of the
kernel later wants to use such a locking mechanism, the CONFIG_CGROUPS
ifdefs should be changed to a higher-up flag that CGROUPS and the other
system would both depend on.

This is a pre-patch for cgroup-procs-write.patch.

Signed-off-by: Ben Blum 
Cc: "Eric W. Biederman" 
Cc: Li Zefan 
Cc: Matt Helsley 
Reviewed-by: Paul Menage 
Cc: Oleg Nesterov 
Cc: David Rientjes 
Cc: Miao Xie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds