If we want load epoch_cyc and epoch_ns atomically,
we should update epoch_cyc_copy first of all.
This notify reader that updating is in progress.
If we update epoch_cyc first like as current implementation,
there is subtle error case.
Look at the below example.
<Initial Condition>
cyc = 9
ns = 900
cyc_copy = 9
== CASE 1 ==
<CPU A = reader> <CPU B = updater>
write cyc = 10
read cyc = 10
read ns = 900
write ns = 1000
write cyc_copy = 10
read cyc_copy = 10
output = (10, 900)
== CASE 2 ==
<CPU A = reader> <CPU B = updater>
read cyc = 9
write cyc = 10
write ns = 1000
read ns = 1000
read cyc_copy = 9
write cyc_copy = 10
output = (9, 1000)
If atomic read is ensured, output should be (9, 900) or (10, 1000).
But, output in example case are not.
So, change updating sequence in order to correct this problem.
Cc: <stable@vger.kernel.org>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
From Will Deacon, this lays the foundation for a basic virtualzed machine type.
* 'for-arm-soc/virt/mach' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
ARM: mach-virt: add SMP support using PSCI
ARM: Dummy Virtual Machine platform support
Signed-off-by: Olof Johansson <olof@lixom.net>
From Will Deacon:
This set of changes moves the arch-timer driver out from arch/arm/ and
into drivers/clocksource and unifies the new driver with the arm64 copy.
* 'for-arm-soc/arch-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
ARM: arch_timers: switch to physical timers if HYP mode is available
Documentation: Add ARMv8 to arch_timer devicetree
arm64: move from arm_generic to arm_arch_timer
arm64: arm_generic: prevent reading stale time
arm: arch_timer: move core to drivers/clocksource
arm: arch_timer: add arch_counter_set_user_access
arm: arch_timer: divorce from local_timer api
arm: arch_timer: add isbs to register accessors
arm: arch_timer: factor out register accessors
arm: arch_timer: split cntfrq accessor
arm: arch_timer: standardise counter reading
arm: arch_timer: use u64/u32 for register data
arm: arch_timer: remove redundant available check
arm: arch_timer: balance device_node refcounting
Signed-off-by: Olof Johansson <olof@lixom.net>
* 'for-rmk/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
ARM: perf: simplify __hw_perf_event_init err handling
ARM: perf: remove unnecessary checks for idx < 0
ARM: perf: handle armpmu_register failing
ARM: perf: don't pretend to support counting of L1I writes
ARM: perf: remove redundant NULL check on cpu_pmu
ARM: Use implementor and part defines from cputype.h
ARM: Define CPU part numbers and implementors
struct compat_ucontext * is a 64-bit pointer, so we need to use a
compat_uptr_t instead to avoid declaring a structure incompatible with
what AArch32 userspace expects.
Cc: <stable@vger.kernel.org>
Reported-by: Edmund Grimley-Evans <Edmund.Grimley-Evans@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* acpi-lpss:
ACPI / platform: create LPSS clocks if Lynxpoint devices are found during scan
clk: x86: add support for Lynxpoint LPSS clocks
x86: add support for Intel Low Power Subsystem
ACPI / platform: fix comment about the platform device name
ACPI: add support for CSRT table
* acpica: (56 commits)
ACPICA: Update version to 20130117
ACPICA: Update predefined info table for _MLS method
ACPICA: Remove some extraneous newlines in ACPI_ERROR type calls
ACPICA: iASL/Disassembler: Add option to ignore NOOP opcodes/operators
ACPICA: AcpiGetSleepTypeData: Allow \_Sx to return either 1 or 2 integers
ACPICA: Update ACPICA copyrights to 2013
ACPICA: Update predefined info table
ACPICA: Cleanup table handler naming conflicts.
ACPICA: Source restructuring: split large files into 8 new files.
ACPICA: Cleanup PM_TIMER_FREQUENCY definition.
ACPICA: Cleanup ACPI_DEBUG_PRINT macros to fix potential build breakages.
ACPICA: Update version to 20121220.
ACPICA: Interpreter: Fix Store() when implicit conversion is not possible.
ACPICA: Resources: Split interrupt share/wake bits into two fields.
ACPICA: Resources: Support for ACPI 5 wake bit in ExtendedInterrupt descriptor.
ACPICA: Interpreter: Add warning if 64-bit constant appears in 32-bit table.
ACPICA: Update ACPICA initialization messages.
ACPICA: Namespace: Eliminate dot...dot output during initialization.
ACPICA: Resource manager: Add support for ACPI 5 wake bit in IRQ descriptor.
ACPICA: Fix possible memory leak in dispatcher error path.
...
When a HP ProLiant DL980 G7 Server boots a regular kernel,
there will be intermittent lost interrupts which could
result in a hang or (in extreme cases) data loss.
The reason is that this system only supports x2apic physical
mode, while the kernel boots with a logical-cluster default
setting.
This bug can be worked around by specifying the "x2apic_phys" or
"nox2apic" boot option, but we want to handle this system
without requiring manual workarounds.
The BIOS sets ACPI_FADT_APIC_PHYSICAL in FADT table.
As all apicids are smaller than 255, BIOS need to pass the
control to the OS with xapic mode, according to x2apic-spec,
chapter 2.9.
Current code handle x2apic when BIOS pass with xapic mode
enabled:
When user specifies x2apic_phys, or FADT indicates PHYSICAL:
1. During madt oem check, apic driver is set with xapic logical
or xapic phys driver at first.
2. enable_IR_x2apic() will enable x2apic_mode.
3. if user specifies x2apic_phys on the boot line, x2apic_phys_probe()
will install the correct x2apic phys driver and use x2apic phys mode.
Otherwise it will skip the driver will let x2apic_cluster_probe to
take over to install x2apic cluster driver (wrong one) even though FADT
indicates PHYSICAL, because x2apic_phys_probe does not check
FADT PHYSICAL.
Add checking x2apic_fadt_phys in x2apic_phys_probe() to fix the
problem.
Signed-off-by: Stoney Wang <song-bo.wang@hp.com>
[ updated the changelog and simplified the code ]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1360263182-16226-1-git-send-email-yinghai@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Fix the following compile warning in kvm_register_steal_time():
CC arch/x86/kernel/kvm.o
arch/x86/kernel/kvm.c: In function ‘kvm_register_steal_time’: arch/x86/kernel/kvm.c:302:3:
warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘phys_addr_t’ [-Wformat]
Introduced via:
5dfd486c47 x86, kvm: Fix kvm's use of __pa() on percpu areas
d765653445 x86, mm: Create slow_virt_to_phys()
f3c4fbb68e x86, mm: Use new pagetable helpers in try_preserve_large_page()
4cbeb51b86 x86, mm: Pagetable level size/shift/mask helpers
a25b931684 x86, mm: Make DEBUG_VIRTUAL work earlier in boot
Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: shuahkhan@gmail.com
Cc: avi@redhat.com
Cc: gleb@redhat.com
Cc: mst@redhat.com
Link: http://lkml.kernel.org/r/1360119442.8356.8.camel@lorien2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This field was needed to differentiate memory slots created by the new
API, KVM_SET_USER_MEMORY_REGION, from those by the old equivalent,
KVM_SET_MEMORY_REGION, whose support was dropped long before:
commit b74a07beed
KVM: Remove kernel-allocated memory regions
Although we also have private memory slots to which KVM allocates
memory with vm_mmap(), !user_alloc slots in other words, the slot id
should be enough for differentiating them.
Note: corresponding function parameters will be removed later.
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Fix PowerPC/Cell build fallout from:
8bd75c77b7 sched/rt: Move rt specific bits into new header file
Reported-by: Michael Ellerman <michael@ellerman.id.au>
Cc: Clark Williams <williams@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20130207094707.7b9f825f@riff.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Without Posted Interrupt, current code is broken. Just disable by
default until Posted Interrupt is ready.
Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
There are two ways to express an interruption subclass:
- As a bitmask, as used in cr6.
- As a number, as used in the I/O interruption word.
Unfortunately, we have treated the I/O interruption word as if it
contained the bitmask as well, which went unnoticed so far as
- (not-yet-released) qemu made the same mistake, and
- Linux guest kernels don't check the isc value in the I/O interruption
word for subchannel interrupts.
Make sure that we treat the I/O interruption word correctly.
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
pm_idle() on openrisc was dead code.
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux@lists.openrisc.net
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Remove the SYMBOL_PREFIX Kconfig symbol as it's empty anyway.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux@lists.openrisc.net
Cc: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
The kernel might be invoked through the reset vector, so to
preserve parameters passed to it, temp regs that are not
in the function parameter range needs to be used.
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Any devices wishing to use the AB8500's GPIO IRQs were forced to
request virtual IRQs from the gpio-ab8500 driver. Now that
responsibility has been passed back to the AB8500 core driver,
devices can request real IRQ numbers instead. This patch removes
any traces of the old virtual IRQ conversion handlers, which will
force any drivers requesting IRQs to use real IRQS.
Cc: arm@kernel.org
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
AB8500 GPIO no longer handles its GPIO IRQs. Instead, the AB8500
core driver has taken back the responsibility. Prior to this
happening, the AB8500 GPIO driver provided a set of virtual IRQs
which were used as a pass-through. These virtual IRQs had a base
of MOP500_AB8500_VIR_GPIO_IRQ_BASE, which was passed though pdata.
We don't need to do this anymore, so we're pulling out the
property from the structure.
Cc: arm@kernel.org
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Remove 32-bit x86 a cmdline param "no-hlt",
and the cpuinfo_x86.hlt_works_ok that it sets.
If a user wants to avoid HLT, then "idle=poll"
is much more useful, as it avoids invocation of HLT
in idle, while "no-hlt" failed to do so.
Indeed, hlt_works_ok was consulted in only 3 places.
First, in /proc/cpuinfo where "hlt_bug yes"
would be printed if and only if the user booted
the system with "no-hlt" -- as there was no other code
to set that flag.
Second, check_hlt() would not invoke halt() if "no-hlt"
were on the cmdline.
Third, it was consulted in stop_this_cpu(), which is invoked
by native_machine_halt()/reboot_interrupt()/smp_stop_nmi_callback() --
all cases where the machine is being shutdown/reset.
The flag was not consulted in the more frequently invoked
play_dead()/hlt_play_dead() used in processor offline and suspend.
Since Linux-3.0 there has been a run-time notice upon "no-hlt" invocations
indicating that it would be removed in 2012.
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
mwait_idle() is a C1-only idle loop intended to be more efficient
than HLT, starting on Pentium-4 HT-enabled processors.
But mwait_idle() has been replaced by the more general
mwait_idle_with_hints(), which handles both C1 and deeper C-states.
ACPI processor_idle and intel_idle use only mwait_idle_with_hints(),
and no longer use mwait_idle().
Here we simplify the x86 native idle code by removing mwait_idle(),
and the "idle=mwait" bootparam used to invoke it.
Since Linux 3.0 there has been a boot-time warning when "idle=mwait"
was invoked saying it would be removed in 2012. This removal
was also noted in the (now removed:-) feature-removal-schedule.txt.
After this change, kernels configured with
(CONFIG_ACPI=n && CONFIG_INTEL_IDLE=n) when run on hardware
that supports MWAIT will simply use HLT. If MWAIT is desired
on those systems, cpuidle and the cpuidle drivers above
can be enabled.
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
This macro is only invoked by Xen,
so make its definition specific to Xen.
> set_pm_idle_to_default()
< xen_set_default_idle()
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: xen-devel@lists.xensource.com
-Compile fix for !SMP
-More cpu cluster id related fixes
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Merge tag 'highbank-fixes-for-3.8' of git://sources.calxeda.com/kernel/linux into fixes
From Rob Herring:
highbank fixes for 3.8
-Compile fix for !SMP
-More cpu cluster id related fixes
* tag 'highbank-fixes-for-3.8' of git://sources.calxeda.com/kernel/linux:
ARM: highbank: mask cluster id from cpu_logical_map
ARM: scu: mask cluster id from cpu_logical_map
ARM: scu: add empty scu_enable for !CONFIG_SMP
Looks like there are few more places that I missed that can cause
compiler warnings. After grepping for omap initcall, all files
needing soc.h should now have it.
Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
I needed this when compiling for pandaboard.
The reason this is needed is that we are now using
omap_initcalls to keep them multiplatform safe.
Signed-off-by: André Hentschel <nerv@dawncrow.de>
[tony@atomide.com: updated comments]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
- Mostly cfa100xx related device tree source updates
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Merge tag 'mxs-dt-3.9' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/dt
From Shawn Guo:
mxs device tree changes for 3.9
- Mostly cfa100xx related device tree source updates
* tag 'mxs-dt-3.9' of git://git.linaro.org/people/shawnguo/linux-2.6:
ARM: mxs: dts: Add rotary encoder to the CFA-10049
ARM: mxs: dts: Add gpio-keys for the rotary to the CFA-10049
ARM: dts: mxs: Add the LCD to the 10049 board
ARM: dts: mxs: Add muxing options for the third PWM
ARM: dts: cfa10049: Change the SPI3 bus to spi-gpio
ARM: mxs: dt: Add Crystalfontz CFA-10037 device tree support
ARM: mxs: Enable touchscreen on m28evk
ARM: dts: cfa10049: Add PCA9555 GPIO expander to the device tree
- A couple of optimization on timer
- Some updates on mxs_defconfig
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Merge tag 'mxs-soc-3.9' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/soc
From Shawn Guo:
mxs soc changes for 3.9
- A couple of optimization on timer
- Some updates on mxs_defconfig
* tag 'mxs-soc-3.9' of git://git.linaro.org/people/shawnguo/linux-2.6:
ARM: mxs_defconfig: Select CONFIG_DEVTMPFS_MOUNT
ARM: mxs: decrease mxs_clockevent_device.min_delta_ns to 2 clock cycles
ARM: mxs: use apbx bus clock to drive the timers on timrotv2
ARM: mxs: Update mxs_defconfig
The Kconfig options selected by ARCH_TEGRA_*_SOC were recently sorted.
Update the newly added ARCH_TEGRA_114_SOC's select statements to match.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
CONFIG_ARCH_TEGRA_114_SOC doesn't currently enable gpiolib, which causes
numerous build problems building a Tegra kernel with only Tegra114
enabled, and not Tegra20 or Tegra30. Enable ARCH_REQUIRE_GPIOLIB to
solve this. However, all Tegra will use gpiolib, so select this option
from ARCH_TEGRA rather than each individual ARCH_TEGRA_*_SOC, to
prevent this problem for any future chips.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This patch fixes the build error when ARCH_TEGRA_114_SOC is enabled
and ARCH_TEGRA_3x_SOC is disabled.
This provides Tegra114 with its own tegra114_init_early() instead of
making use of tegra30_init_early() so that T114 build doesn't depend
on T3x anymore.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This pull request adds support for I2C0 and watchdog timer
for DA850 EVM booting using device tree. It also enables
machine reboot when using device tree.
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Merge tag 'davinci-for-v3.9/dt-2' of git://gitorious.org/linux-davinci/linux-davinci into next/dt
From Sekhar Nori:
Second round of DT updates for DaVinci.
This pull request adds support for I2C0 and watchdog timer
for DA850 EVM booting using device tree. It also enables
machine reboot when using device tree.
* tag 'davinci-for-v3.9/dt-2' of git://gitorious.org/linux-davinci/linux-davinci:
ARM: davinci: da850 DT: add support for machine reboot
ARM: davinci: da850: add wdt DT node
ARM: davinci: da850: add DT node for I2C0
- adding the watchdog to Animeo IP board
- some more DT support for at91rm9200 peripherals
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Merge tag 'at91-dt' of git://github.com/at91linux/linux-at91 into next/dt
From Nicolas Ferre:
Update to DT files for AT91:
- adding the watchdog to Animeo IP board
- some more DT support for at91rm9200 peripherals
* tag 'at91-dt' of git://github.com/at91linux/linux-at91:
ARM: at91: add EMAC bindings to RM9200 DT
ARM: at91: add SSC bindings to RM9200 DT
ARM: at91: add MMC bindings to RM9200 DT
ARM: at91: Animeo IP: enable watchdog support
Signed-off-by: Olof Johansson <olof@lixom.net>
Update for audio support via omap-twl4030 and pwm updates in board level,
and zoom-peripherals update to not request the TWL GPIO7.
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Merge tag 'omap-for-v3.9/twl-signed-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/boards
From Tony Lidgren:
OMAP TWL updates from Peter Ujfalusi <peter.ujfalusi@ti.com>:
Update for audio support via omap-twl4030 and pwm updates in board level,
and zoom-peripherals update to not request the TWL GPIO7.
* tag 'omap-for-v3.9/twl-signed-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP2+: Fix twl section warnings related to omap_twl4030_audio_init
ARM: board-zoom: Do not request LCD panel enable GPIO from twl4030
ARM: OMAP: omap3beagle: Use the pwm_leds driver to control the PMU_STAT led
ARM: OMAP: board-4430sdp: Proper support for TWL6030 PWM LED/Backlight
ARM: OMAP: sdp3430: Audio support via the common omap-twl4030 machine driver
ARM: OMAP: zoom: Audio support via the common omap-twl4030 machine driver
ARM: OMAP2+: twl-common: Allow boards to customize the twl4030 audio setup
ARM: OMAP2+: twl-common: Add default twl4030 audio configuration
ARM: OMAP: zoom: Zoom2 does not have extmute functionality
ARM: OMAP: 3430sdp: Enable extmute functionality for audio
Register ARM architected timer.
This is preparatory work by Magnus Damm for SoC(s) that use
the ARM architected timer.
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Merge tag 'renesas-soc4-for-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc
From Simon Horman:
Fourth round of Renesas ARM-based SoC changes for v3.9
Register ARM architected timer.
This is preparatory work by Magnus Damm for SoC(s) that use
the ARM architected timer.
* tag 'renesas-soc4-for-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: shmobile: Register ARM architected timer
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Merge tag 'at91-cleanup' of git://github.com/at91linux/linux-at91 into next/cleanup
From Nicolas Ferre:
Little AT91 cleanup: only remove one deprecated board.
* tag 'at91-cleanup' of git://github.com/at91linux/linux-at91:
ARM: at91: remove NEOCORE 926 board
Signed-off-by: Olof Johansson <olof@lixom.net>
Modify/remove conflict in arch/arm/mach-at91/board-neocore926.c
When running on Integrator/AP using atags, ap_syscon_base is initialised
in ->map_io, which isn't called for !MMU platforms.
Instead, initialise the pointer in ->machine_init, as we do when booting
with device-tree.
Cc: stable@vger.kernel.org
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Update the da8xx_restart() function to support machine reboot
when booting using DT. Have the function search for the watchdog
platform device instead of always using "da8xx_wdt_device" which
is never registered in DT case.
While at it, also make da8xx_wdt_device static since there is no need
for it to be globally visible.
Tested machine reboot with both DT and non-DT boot on DA850 EVM.
Signed-off-by: Kumar, Anil <anilkumar.v@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
