12 Jan, 2012
2 commits
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* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci: (80 commits)
x86/PCI: Expand the x86_msi_ops to have a restore MSIs.
PCI: Increase resource array mask bit size in pcim_iomap_regions()
PCI: DEVICE_COUNT_RESOURCE should be equal to PCI_NUM_RESOURCES
PCI: pci_ids: add device ids for STA2X11 device (aka ConneXT)
PNP: work around Dell 1536/1546 BIOS MMCONFIG bug that breaks USB
x86/PCI: amd: factor out MMCONFIG discovery
PCI: Enable ATS at the device state restore
PCI: msi: fix imbalanced refcount of msi irq sysfs objects
PCI: kconfig: English typo in pci/pcie/Kconfig
PCI/PM/Runtime: make PCI traces quieter
PCI: remove pci_create_bus()
xtensa/PCI: convert to pci_scan_root_bus() for correct root bus resources
x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus()
x86/PCI: use pci_scan_bus() instead of pci_scan_bus_parented()
x86/PCI: read Broadcom CNB20LE host bridge info before PCI scan
sparc32, leon/PCI: convert to pci_scan_root_bus() for correct root bus resources
sparc/PCI: convert to pci_create_root_bus()
sh/PCI: convert to pci_scan_root_bus() for correct root bus resources
powerpc/PCI: convert to pci_create_root_bus()
powerpc/PCI: split PHB part out of pcibios_map_io_space()
...Fix up conflicts in drivers/pci/msi.c and include/linux/pci_regs.h due
to the same patches being applied in other branches. -
frv, h8300, m68k, microblaze, openrisc, score, um and xtensa currently
do not register a CPU device. Add the config option GENERIC_CPU_DEVICES
which causes a generic CPU device to be registered for each present CPU,
and make all these architectures select it.Richard Weinberger covered UML and suggested using
per_cpu.Signed-off-by: Ben Hutchings
Signed-off-by: Linus Torvalds
11 Jan, 2012
2 commits
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lib: use generic pci_iomap on all architectures
Many architectures don't want to pull in iomap.c,
so they ended up duplicating pci_iomap from that file.
That function isn't trivial, and we are going to modify it
https://lkml.org/lkml/2011/11/14/183
so the duplication hurts.This reduces the scope of the problem significantly,
by moving pci_iomap to a separate file and
referencing that from all architectures.* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
alpha: drop pci_iomap/pci_iounmap from pci-noop.c
mn10300: switch to GENERIC_PCI_IOMAP
mn10300: add missing __iomap markers
frv: switch to GENERIC_PCI_IOMAP
tile: switch to GENERIC_PCI_IOMAP
tile: don't panic on iomap
sparc: switch to GENERIC_PCI_IOMAP
sh: switch to GENERIC_PCI_IOMAP
powerpc: switch to GENERIC_PCI_IOMAP
parisc: switch to GENERIC_PCI_IOMAP
mips: switch to GENERIC_PCI_IOMAP
microblaze: switch to GENERIC_PCI_IOMAP
arm: switch to GENERIC_PCI_IOMAP
alpha: switch to GENERIC_PCI_IOMAP
lib: add GENERIC_PCI_IOMAP
lib: move GENERIC_IOMAP to lib/KconfigFix up trivial conflicts due to changes nearby in arch/{m68k,score}/Kconfig
-
* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Wire-up new system calls
microblaze: Remove NO_IRQ from architecture
input: xilinx_ps2: Don't use NO_IRQ
block: xsysace: Don't use NO_IRQ
microblaze: Trivial asm fix
microblaze: Fix debug message in module
microblaze: Remove eprintk macro
microblaze: Send CR before LF for early console
microblaze: Change NO_IRQ to 0
microblaze: Use irq_of_parse_and_map for timer
microblaze: intc: Change variable name
microblaze: Use of_find_compatible_node for timer and intc
microblaze: Add __cmpdi2
microblaze: Synchronize __pa __va macros
09 Jan, 2012
1 commit
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* 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits)
PM / Hibernate: Implement compat_ioctl for /dev/snapshot
PM / Freezer: fix return value of freezable_schedule_timeout_killable()
PM / shmobile: Allow the A4R domain to be turned off at run time
PM / input / touchscreen: Make st1232 use device PM QoS constraints
PM / QoS: Introduce dev_pm_qos_add_ancestor_request()
PM / shmobile: Remove the stay_on flag from SH7372's PM domains
PM / shmobile: Don't include SH7372's INTCS in syscore suspend/resume
PM / shmobile: Add support for the sh7372 A4S power domain / sleep mode
PM: Drop generic_subsys_pm_ops
PM / Sleep: Remove forward-only callbacks from AMBA bus type
PM / Sleep: Remove forward-only callbacks from platform bus type
PM: Run the driver callback directly if the subsystem one is not there
PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers
PM/Devfreq: Add Exynos4-bus device DVFS driver for Exynos4210/4212/4412.
PM / Sleep: Merge internal functions in generic_ops.c
PM / Sleep: Simplify generic system suspend callbacks
PM / Hibernate: Remove deprecated hibernation snapshot ioctls
PM / Sleep: Fix freezer failures due to racy usermodehelper_is_disabled()
ARM: S3C64XX: Implement basic power domain support
PM / shmobile: Use common always on power domain governor
...Fix up trivial conflict in fs/xfs/xfs_buf.c due to removal of unused
XBT_FORCE_SLEEP bit
08 Jan, 2012
1 commit
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Changes queued in gpio/next for the start of the 3.3 merge window
* tag 'gpio-for-linus-20120104' of git://git.secretlab.ca/git/linux-2.6:
gpio: Add decode of WM8994 GPIO configuration
gpio: Convert GPIO drivers to module_platform_driver
gpio: Fix typo in comment in Samsung driver
gpio: Explicitly index samsung_gpio_cfgs
gpio: Add Linus Walleij as gpio co-maintainer
of: Add device tree selftests
of: create of_phandle_args to simplify return of phandle parsing data
gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()
gpio/microblaze: Eliminate duplication of of_get_named_gpio_flags()
gpiolib: output basic details and consolidate gpio device drivers
pch_gpio: Change company name OKI SEMICONDUCTOR to LAPIS Semiconductor
pch_gpio: Support new device LAPIS Semiconductor ML7831 IOH
spi/pl022: make the chip deselect handling thread safe
spi/pl022: add support for pm_runtime autosuspend
spi/pl022: disable the PL022 block when unused
spi/pl022: move device disable to workqueue thread
spi/pl022: skip default configuration before suspending
spi/pl022: fix build warnings
spi/pl022: only enable RX interrupts when TX is complete
07 Jan, 2012
6 commits
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Microblaze doesn't need to replace pci_scan_child_bus() or do anything
special before pci_bus_add_devices(), so we can use the more generic PCI
path in pci_scan_root_bus().CC: Michal Simek
Signed-off-by: Bjorn Helgaas
Signed-off-by: Jesse Barnes -
Convert from pci_create_bus() to pci_create_root_bus(). This way the root
bus resources are correct immediately. This patch doesn't fix a problem
because microblaze fixed the resources before scanning the bus, but it makes
microblaze more consistent with other architectures. It also allows us to
use the pci_scan_root_bus() path safely.CC: Michal Simek
Signed-off-by: Bjorn Helgaas
Signed-off-by: Jesse Barnes -
CC: Michal Simek
Signed-off-by: Bjorn Helgaas
Signed-off-by: Jesse Barnes -
The pci_bus_for_each_resource() iterator sets "res" itself, so there's
no need to look it up in the bus->resource[] table.Logically part of 89a74ecccd and 8a66da71fa.
CC: Michal Simek
Signed-off-by: Bjorn Helgaas
Signed-off-by: Jesse Barnes -
This patch converts MicroBlaze's architecture-specific
'pcibios_set_master()' routine to a non-inlined function. This will
allow follow on patches to create a generic 'pcibios_set_master()'
function using the '__weak' attribute which can be used by all
architectures as a default which, if necessary, can then be over-
ridden by architecture-specific code.Converting 'pci_bios_set_master()' to a non-inlined function will
allow MicroBlaze's 'pcibios_set_master()' implementation to remain
architecture-specific after the generic version is introduced and thus,
not change current behavior.No functional change.
Signed-off-by: Myron Stowe
Signed-off-by: Jesse Barnes -
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
cpu: Export cpu_up()
rcu: Apply ACCESS_ONCE() to rcu_boost() return value
Revert "rcu: Permit rt_mutex_unlock() with irqs disabled"
docs: Additional LWN links to RCU API
rcu: Augment rcu_batch_end tracing for idle and callback state
rcu: Add rcutorture tests for srcu_read_lock_raw()
rcu: Make rcutorture test for hotpluggability before offlining CPUs
driver-core/cpu: Expose hotpluggability to the rest of the kernel
rcu: Remove redundant rcu_cpu_stall_suppress declaration
rcu: Adaptive dyntick-idle preparation
rcu: Keep invoking callbacks if CPU otherwise idle
rcu: Irq nesting is always 0 on rcu_enter_idle_common
rcu: Don't check irq nesting from rcu idle entry/exit
rcu: Permit dyntick-idle with callbacks pending
rcu: Document same-context read-side constraints
rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass
rcu: Remove dynticks false positives and RCU failures
rcu: Reduce latency of rcu_prepare_for_idle()
rcu: Eliminate RCU_FAST_NO_HZ grace-period hang
rcu: Avoid needlessly IPIing CPUs at GP end
...
05 Jan, 2012
12 commits
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Wire up three system calls
sendmmsg/process_vm_readv/process_vm_writevAll tested by testing apps.
Look at:
net: Add sendmmsg socket system call
(sha1: 228e548e602061b08ee8e8966f567c12aa079682)
Cross Memory Attach
(sha1: fcf634098c00dd9cd247447368495f0b79be12d1)Signed-off-by: Michal Simek
-
NO_IRQ shouldn't be used by any driver. All Microblaze
drivers are fixed that's why NO_IRQ can be removed.Also fix pci-common.c which has references to NO_IRQ removed.
Signed-off-by: Michal Simek
Reviewed-by: Ryan Mallon
Acked-by: Grant Likely
CC: Benjamin Herrenschmidt -
Just replace one dot with comma. New binutils can detect it.
Signed-off-by: Michal Simek
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Trivial fix.
Signed-off-by: Michal Simek
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eprintk macro was used for printing early_printk
messages. Early console registration was changed
that's why this is not needed.Signed-off-by: Michal Simek
-
This patch fixes problem with measuring tools.
Signed-off-by: Michal Simek
-
As has been discussed many times[1], Using NO_IRQ set to anything other
than 0 is bug waiting to happen since many drivers follow the pattern
"if (!irq)" for testing whether or not an irq has been set.This patch changes the Microblaze NO_IRQ setting from -1 to 0 to bring
it in line with most of the rest of the kernel. It also prepares for
Microblaze eventually supporting multiple interrupt controllers by
breaking the assumption that hwirq# == Linux IRQ#. The Linux IRQ
number is just a cookie with no guarantee of a direct relationship
with the hardware irq arrangement.At this point, Microblaze interrupt handling only supports only one
instance of one kind of interrupt controller (xilinx_intc). This change
shouldn't affect any architecture code outside of the interrupt
controller driver and the irq_of mapping.Updated to 3.2 and to use irq_data.hwirq by Rob Herring.
Tested and fixed by Michal Simek.[1] http://lkml.org/lkml/2005/11/21/221
Signed-off-by: Grant Likely
Signed-off-by: Rob Herring
Signed-off-by: Michal Simek -
It is necessary to call generic function for irq finding.
The main reason is that this generic function calls irq_create_of_mapping
which can add some shift because of NO_IRQ.Signed-off-by: Michal Simek
-
intr_type is mask - change name.
s/intr_type/intr_mask/gSigned-off-by: Michal Simek
-
Calling of_find_compatible_node instead of calling private code
which does the same.Signed-off-by: Michal Simek
-
Some new kernel configurations require __cmpdi2 function.
Signed-off-by: Michal Simek
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noMMU and MMU system use the same macros - synchronize them.
Signed-off-by: Michal Simek
13 Dec, 2011
1 commit
-
of_reset_gpio_handle() is largely a cut-and-paste copy of
of_get_named_gpio_flags(). There really isn't any reason for the
split, so this patch deletes the duplicate functionSigned-off-by: Grant Likely
Cc: Michal Simek
12 Dec, 2011
3 commits
-
Those two APIs were provided to optimize the calls of
tick_nohz_idle_enter() and rcu_idle_enter() into a single
irq disabled section. This way no interrupt happening in-between would
needlessly process any RCU job.Now we are talking about an optimization for which benefits
have yet to be measured. Let's start simple and completely decouple
idle rcu and dyntick idle logics to simplify.Signed-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Thomas Gleixner
Cc: Peter Zijlstra
Reviewed-by: Josh Triplett
Signed-off-by: Paul E. McKenney -
It is assumed that rcu won't be used once we switch to tickless
mode and until we restart the tick. However this is not always
true, as in x86-64 where we dereference the idle notifiers after
the tick is stopped.To prepare for fixing this, add two new APIs:
tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().If no use of RCU is made in the idle loop between
tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
must instead call the new *_norcu() version such that the arch doesn't
need to call rcu_idle_enter() and rcu_idle_exit().Otherwise the arch must call tick_nohz_enter_idle() and
tick_nohz_exit_idle() and also call explicitly:- rcu_idle_enter() after its last use of RCU before the CPU is put
to sleep.
- rcu_idle_exit() before the first use of RCU after the CPU is woken
up.Signed-off-by: Frederic Weisbecker
Cc: Mike Frysinger
Cc: Guan Xuetao
Cc: David Miller
Cc: Chris Metcalf
Cc: Hans-Christian Egtvedt
Cc: Ralf Baechle
Cc: Paul E. McKenney
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: H. Peter Anvin
Cc: Russell King
Cc: Paul Mackerras
Cc: Heiko Carstens
Cc: Paul Mundt
Signed-off-by: Paul E. McKenney -
The tick_nohz_stop_sched_tick() function, which tries to delay
the next timer tick as long as possible, can be called from two
places:- From the idle loop to start the dytick idle mode
- From interrupt exit if we have interrupted the dyntick
idle mode, so that we reprogram the next tick event in
case the irq changed some internal state that requires this
action.There are only few minor differences between both that
are handled by that function, driven by the ts->inidle
cpu variable and the inidle parameter. The whole guarantees
that we only update the dyntick mode on irq exit if we actually
interrupted the dyntick idle mode, and that we enter in RCU extended
quiescent state from idle loop entry only.Split this function into:
- tick_nohz_idle_enter(), which sets ts->inidle to 1, enters
dynticks idle mode unconditionally if it can, and enters into RCU
extended quiescent state.- tick_nohz_irq_exit() which only updates the dynticks idle mode
when ts->inidle is set (ie: if tick_nohz_idle_enter() has been called).To maintain symmetry, tick_nohz_restart_sched_tick() has been renamed
into tick_nohz_idle_exit().This simplifies the code and micro-optimize the irq exit path (no need
for local_irq_save there). This also prepares for the split between
dynticks and rcu extended quiescent state logics. We'll need this split to
further fix illegal uses of RCU in extended quiescent states in the idle
loop.Signed-off-by: Frederic Weisbecker
Cc: Mike Frysinger
Cc: Guan Xuetao
Cc: David Miller
Cc: Chris Metcalf
Cc: Hans-Christian Egtvedt
Cc: Ralf Baechle
Cc: Paul E. McKenney
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: H. Peter Anvin
Cc: Russell King
Cc: Paul Mackerras
Cc: Heiko Carstens
Cc: Paul Mundt
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
09 Dec, 2011
3 commits
-
The only function of memblock_analyze() is now allowing resize of
memblock region arrays. Rename it to memblock_allow_resize() and
update its users.* The following users remain the same other than renaming.
arm/mm/init.c::arm_memblock_init()
microblaze/kernel/prom.c::early_init_devtree()
powerpc/kernel/prom.c::early_init_devtree()
openrisc/kernel/prom.c::early_init_devtree()
sh/mm/init.c::paging_init()
sparc/mm/init_64.c::paging_init()
unicore32/mm/init.c::uc32_memblock_init()* In the following users, analyze was used to update total size which
is no longer necessary.powerpc/kernel/machine_kexec.c::reserve_crashkernel()
powerpc/kernel/prom.c::early_init_devtree()
powerpc/mm/init_32.c::MMU_init()
powerpc/mm/tlb_nohash.c::__early_init_mmu()
powerpc/platforms/ps3/mm.c::ps3_mm_add_memory()
powerpc/platforms/embedded6xx/wii.c::wii_memory_fixups()
sh/kernel/machine_kexec.c::reserve_crashkernel()* x86/kernel/e820.c::memblock_x86_fill() was directly setting
memblock_can_resize before populating memblock and calling analyze
afterwards. Call memblock_allow_resize() before start populating.memblock_can_resize is now static inside memblock.c.
Signed-off-by: Tejun Heo
Cc: Benjamin Herrenschmidt
Cc: Yinghai Lu
Cc: Russell King
Cc: Michal Simek
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Guan Xuetao
Cc: "H. Peter Anvin" -
memblock_init() initializes arrays for regions and memblock itself;
however, all these can be done with struct initializers and
memblock_init() can be removed. This patch kills memblock_init() and
initializes memblock with struct initializer.The only difference is that the first dummy entries don't have .nid
set to MAX_NUMNODES initially. This doesn't cause any behavior
difference.Signed-off-by: Tejun Heo
Cc: Benjamin Herrenschmidt
Cc: Yinghai Lu
Cc: Russell King
Cc: Michal Simek
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Guan Xuetao
Cc: "H. Peter Anvin" -
24aa07882b (memblock, x86: Replace memblock_x86_reserve/free_range()
with generic ones) removed arch/x86/include/asm/memblock.h and dropped
its inclusion from include/linux/memblock.h which breaks other
architectures which depended on the generic memblock.h pulling in the
arch specific one.However, the proper fix isn't adding back the asm inclusion. memblock
doesn't have any arch dependent part and doesn't need arch specific
header file and asm/memblock.h files are either practically empty or
contain mostly unrelated arch specific stuff.* In microblaze, sh, powerpc, sparc and openrisc, asm/memblock.h is
either empty or just contains unused MEMBLOCK_DBG() macro. Remove
them.* In arm and unicore32, asm/memblock.h contains arch specific stuff.
Include it directly from its users. It might be a good idea to
rename the header file to avoid confusion.Signed-off-by: Tejun Heo
Reported-by: "H. Peter Anvin"
Cc: Yinghai Lu
Cc: Russell King
Cc: Michal Simek
Cc: Benjamin Herrenschmidt
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Guan Xuetao
29 Nov, 2011
1 commit
-
microblaze copied pci_iomap from generic code, probably to avoid
pulling the rest of iomap.c in. Since that's in
a separate file now, we can reuse the common implementation.The only difference is handling of nocache flag,
that turns out to be done correctly by the
generic code since arch/microblaze/include/asm/io.h
defines ioremap_nocache same as ioremap.Signed-off-by: Michael S. Tsirkin
24 Nov, 2011
1 commit
-
* 'pm-freezer' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc: (24 commits)
freezer: fix wait_event_freezable/__thaw_task races
freezer: kill unused set_freezable_with_signal()
dmatest: don't use set_freezable_with_signal()
usb_storage: don't use set_freezable_with_signal()
freezer: remove unused @sig_only from freeze_task()
freezer: use lock_task_sighand() in fake_signal_wake_up()
freezer: restructure __refrigerator()
freezer: fix set_freezable[_with_signal]() race
freezer: remove should_send_signal() and update frozen()
freezer: remove now unused TIF_FREEZE
freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE
cgroup_freezer: prepare for removal of TIF_FREEZE
freezer: clean up freeze_processes() failure path
freezer: kill PF_FREEZING
freezer: test freezable conditions while holding freezer_lock
freezer: make freezing indicate freeze condition in effect
freezer: use dedicated lock instead of task_lock() + memory barrier
freezer: don't distinguish nosig tasks on thaw
freezer: remove racy clear_freeze_flag() and set PF_NOFREEZE on dead tasks
freezer: rename thaw_process() to __thaw_task() and simplify the implementation
...
22 Nov, 2011
2 commits
-
altroot support has been gone for years, along with arch/*/asm/namei.h;
looks like a dummy survivor that sat it out in microblaze tree...Signed-off-by: Al Viro
-
Signed-off-by: Tejun Heo
Cc: Arnd Bergmann
Cc: linux-arch@vger.kernel.org
07 Nov, 2011
1 commit
-
* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits)
Revert "tracing: Include module.h in define_trace.h"
irq: don't put module.h into irq.h for tracking irqgen modules.
bluetooth: macroize two small inlines to avoid module.h
ip_vs.h: fix implicit use of module_get/module_put from module.h
nf_conntrack.h: fix up fallout from implicit moduleparam.h presence
include: replace linux/module.h with "struct module" wherever possible
include: convert various register fcns to macros to avoid include chaining
crypto.h: remove unused crypto_tfm_alg_modname() inline
uwb.h: fix implicit use of asm/page.h for PAGE_SIZE
pm_runtime.h: explicitly requires notifier.h
linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h
miscdevice.h: fix up implicit use of lists and types
stop_machine.h: fix implicit use of smp.h for smp_processor_id
of: fix implicit use of errno.h in include/linux/of.h
of_platform.h: delete needless include
acpi: remove module.h include from platform/aclinux.h
miscdevice.h: delete unnecessary inclusion of module.h
device_cgroup.h: delete needless include
net: sch_generic remove redundant use of
net: inet_timewait_sock doesnt need
...Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in
- drivers/media/dvb/frontends/dibx000_common.c
- drivers/media/video/{mt9m111.c,ov6650.c}
- drivers/mfd/ab3550-core.c
- include/linux/dmaengine.h
01 Nov, 2011
2 commits
-
For access to the EXPORT_SYMBOL variants and THIS_MODULE macros.
Signed-off-by: Paul Gortmaker
-
* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW usage
microblaze: Use delay slot in __strnlen_user, __strncpy_user
microblaze: Remove NET_IP_ALIGN from system.h
microblaze: Add __ucmpdi2() helper function
microblaze: Raise SIGFPE/FPE_INTDIV for div by zero
microblaze: Switch ELF_ARCH code to 189
microblaze: Added DMA sync operations
microblaze: Moved __dma_sync() to dma-mapping.h
microblaze: Add PVR for Microblaze v8.20.a
microblaze: Fix access_ok macro
microblaze: Add loop unrolling for PAGE in copy_tofrom_user
microblaze: Simplify logic for unaligned byte copying
microblaze: Change label names - copy_tofrom_user
microblaze: Separate fixup section definition
microblaze: Change label name in copy_tofrom_user
microblaze: Clear top bit from cnt32_to_63
14 Oct, 2011
2 commits
-
As far as I can tell the only reason microblaze has
__ARCH_WANT_INTERRUPTS_ON_CTXSW is because it initializes new task state
with interrupts enabled so that on switch_to() interrupts get enabled.So change copy_thread() to clear MSR_IE instead of set it, this will
ensure switch_to() will always keep IRQs disabled.The scheduler will disable IRQs when taking rq->lock in schedule() and
enable IRQs in finish_lock_switch() after its done its magic.This leaves ARM the only __ARCH_WANT_INTERRUPTS_ON_CTXSW user.
Signed-off-by: Peter Zijlstra
Signed-off-by: Michal Simek -
Use delay slot to speedup if maxlen is zero.
Signed-off-by: Michal Simek
