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It is always better to check return values, so add some new checks and
correct existing ones.
v2: Be consistent and don't mix errors from -E* and AE_* namespaces.
Signed-off-by: Igor Murzov <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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This adds the basic drm dma-buf interface layer, called PRIME. This
commit doesn't add any driver support, it is simply and agreed upon starting
point so we can work towards merging driver support for the next merge window.
Current drivers with work done are nouveau, i915, udl, exynos and omap.
The main APIs exposed to userspace allow translating a 32-bit object handle
to a file descriptor, and a file descriptor to a 32-bit object handle.
The flags value is currently limited to O_CLOEXEC.
Acknowledgements:
Daniel Vetter: lots of review
Rob Clark: cleaned up lots of the internals and did lifetime review.
v2: rename some functions after Chris preferred a green shed
fix IS_ERR_OR_NULL -> IS_ERR
v3: Fix Ville pointed out using buffer + kmalloc
v4: add locking as per ickle review
v5: allow re-exporting the original dma-buf (Daniel)
Reviewed-by: Daniel Vetter <[email protected]>
Reviewed-by: Rob Clark <[email protected]>
Reviewed-by: Sumit Semwal <[email protected]>
Reviewed-by: Inki Dae <[email protected]>
Acked-by: Ben Widawsky <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
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Follows the 8250 change for pretty much the same rationale.
See commit "serial: use serial_port_in/out vs serial_in/out in 8250".
Signed-off-by: Paul Mundt <[email protected]>
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The recent merge of the sa11x0 code into mainline had silent conflicts
with further development of the DMA engine API, leading to build errors
and warnings:
drivers/net/irda/sa1100_ir.c: In function 'sa1100_irda_dma_start':
drivers/net/irda/sa1100_ir.c:151: error: too few arguments to function 'chan->device->device_prep_slave_sg'
drivers/dma/sa11x0-dma.c: In function 'sa11x0_dma_probe':
drivers/dma/sa11x0-dma.c:950: warning: assignment from incompatible pointer type
Fix these.
Signed-off-by: Russell King <[email protected]>
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ACPI 5.0 adds the BGRT, a table that contains a pointer to the firmware
boot splash and associated metadata. This simple driver exposes it via
/sys/firmware/acpi in order to allow bootsplash applications to draw their
splash around the firmware image and reduce the number of jarring graphical
transitions during boot.
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Drivers may wish to add entries to /sys/firmware/acpi, so export acpi_kobj
in order to let them do that.
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Make sure the removal of mappings uses the same logic that put the
mappings in place.
Signed-off-by: Myron Stowe <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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The function apei_estatus_print() and apei_estatus_check() forget to move ahead
the gdata pointer when dealing with multiple generic error data sections.
Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Clean the redundant codes of apci_bus_get_power_flags().
Signed-off-by: Alex He <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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The acpi_processor_cst_has_changed() function is invoked from a
CPU_ONLINE or CPU_DEAD function, which might well execute on CPU 0
even though the CPU being hotplugged is some other CPU. In addition,
acpi_processor_cst_has_changed() invokes smp_processor_id() without
protection, resulting in splats when onlining CPUs.
This commit therefore changes the smp_processor_id() to pr->id, as is
used elsewhere in the code, for example, in acpi_processor_add().
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Srivatsa S. Bhat <[email protected]>
Tested-by: Yong Zhang <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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... so that acpi_unmap()'s behavior gets in sync with acpi_map()'s.
Signed-off-by: Jan Beulich <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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During testing pci root bus removal, found some root bus bridge is not freed.
If booting with pnpacpi=off, those hostbridge could be freed without problem.
It turns out that some devices reference are not released during acpi_pnp_match.
that match should not hold one device ref during every calling.
Add pu_device calling before returning.
Signed-off-by: Yinghai Lu <[email protected]>
Cc: [email protected]
Signed-off-by: Len Brown <[email protected]>
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The function acpi_processor_add is stored in the ops.add field of a
acpi_driver structure. This function is then called in
acpi_bus_driver_init. On failure, this function clears the field
device->driver_data, but does not free its contents. Thus the free has to
be done by the add function. In acpi_processor_add, the corresponding
value is pr. This value is currently freed on failure before storing it in
device->driver_data, but not after. This free is added in the error
handling code at the end of the function. The per_cpu variable
processors is also cleared so that it does not refer to a dangling pointer.
Signed-off-by: Julia Lawall <[email protected]>
Reviewed-by: Srivatsa S. Bhat <[email protected]>
Acked-by: Deepthi Dharwar <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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The current code incorrectly assumes that
(1) the APEI register bit width is always 8, 16, 32, or 64 and
(2) the APEI register bit width is always equal to the APEI
register access width.
ERST serialization instructions entries such as:
[030h 0048 1] Action : 00 [Begin Write Operation]
[031h 0049 1] Instruction : 03 [Write Register Value]
[032h 0050 1] Flags (decoded below) : 01
Preserve Register Bits : 1
[033h 0051 1] Reserved : 00
[034h 0052 12] Register Region : [Generic Address Structure]
[034h 0052 1] Space ID : 00 [SystemMemory]
[035h 0053 1] Bit Width : 03
[036h 0054 1] Bit Offset : 00
[037h 0055 1] Encoded Access Width : 03 [DWord Access:32]
[038h 0056 8] Address : 000000007F2D7038
[040h 0064 8] Value : 0000000000000001
[048h 0072 8] Mask : 0000000000000007
break this assumption by yielding:
[Firmware Bug]: APEI: Invalid bit width in GAR [0x7f2d7038/3/0]
I have found no ACPI specification requirements corresponding
with the above assumptions. There is even a good example in
the Serialization Instruction Entries section (ACPI 4.0 section
17.4,1.2, ACPI 4.0a section 2.5.1.2, ACPI 5.0 section 18.5.1.2)
that mentions a serialization instruction with a bit range of
[6:2] which is 5 bits wide, _not_ 8, 16, 32, or 64 bits wide.
Compile and boot tested with 3.3.0-rc7 on a IBM HX5.
Signed-off-by: Gary Hade <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Some APEI firmware implementation will access injected address
specified in param1 to trigger the error when injecting memory
error, which means if one SRAR error is injected, the crash
always happens because it is executed in kernel context. This
new parameter can disable trigger action and control is taken
over by the user. In this way, an SRAR error can happen in user
context instead of crashing the system. This function is highly
depended on BIOS implementation so please ensure you know the
BIOS trigger procedure before you enable this switch.
v2:
notrigger should be created together with param1/param2
Tested-by: Tony Luck <[email protected]>
Signed-off-by: Chen Gong <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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On the platforms with ACPI4.x support, parameter extension
is not always doable, which means only parameter extension
is enabled, einj_param can take effect.
v2->v1: stopping early in einj_get_parameter_address for einj_param
Signed-off-by: Chen Gong <[email protected]>
Acked-by: Tony Luck <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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This fixes a trivial copy & paste error in ERST header length check.
It's just for future safety because sizeof(struct acpi_table_einj)
equals to sizeof(struct acpi_table_erst) with current ACPI5.0
specification. It applies to v3.3-rc6.
Signed-off-by: Jiang Liu <[email protected]>
Acked-by: Huang Ying <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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power_usage is always assigned a negative value and should be declared
a signed integer
Signed-off-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Currently when a CPU is off-lined it enters either MWAIT-based idle or,
if MWAIT is not desired or supported, HLT-based idle (which places the
processor in C1 state). This patch allows processors without MWAIT
support to stay in states deeper than C1.
Signed-off-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Pull SuperH updates from Paul Mundt.
* tag 'sh-for-linus' of git://github.com/pmundt/linux-sh: (25 commits)
sh: Support I/O space swapping where needed.
sh: use set_current_blocked() and block_sigmask()
sh: no need to reset handler if SA_ONESHOT
sh: intc: Fix up section mismatch for intc_ack_data
sh: select ARCH_DISCARD_MEMBLOCK.
sh: Consolidate duplicate _32/_64 unistd definitions.
sh: ecovec: switch SDHI controllers to card polling
sh: Avoid exporting unimplemented syscalls.
sh: add platform_device for RSPI in setup-sh7757
SH: pci-sh7780: enable big-endian operation.
serial: sh-sci: fix a race of DMA submit_tx on transfer
sh: dma: Collect up CHCR of SH7763, SH7764, SH7780 and SH7785
sh: dma: Collect up CHCR of SH7723 and SH7730
sh/next: Fix build fail by asm/system.h in asm/bitops.h
arch/sh/drivers/dma/{dma-g2,dmabrg}.c: ensure arguments to request_irq and free_irq are compatible
sh: cpufreq: Wire up scaling_available_freqs support.
sh: cpufreq: notify about rate rounding fallback.
sh: cpufreq: Support CPU clock frequency table.
sh: cpufreq: struct device lookup from CPU topology.
sh: cpufreq: percpu struct clk accounting.
...
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acpi_processor_install_hotplug_notify() registers processor objects to
receive ACPI CPU hotplug event notifications. This patch additionally
registers processor device objects (ACPI0007) to receive the notifications
as well.
Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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The X86_32-only disable_hlt/enable_hlt mechanism was used by the
32-bit floppy driver. Its effect was to replace the use of the
HLT instruction inside default_idle() with cpu_relax() - essentially
it turned off the use of HLT.
This workaround was commented in the code as:
"disable hlt during certain critical i/o operations"
"This halt magic was a workaround for ancient floppy DMA
wreckage. It should be safe to remove."
H. Peter Anvin additionally adds:
"To the best of my knowledge, no-hlt only existed because of
flaky power distributions on 386/486 systems which were sold to
run DOS. Since DOS did no power management of any kind,
including HLT, the power draw was fairly uniform; when exposed
to the much hhigher noise levels you got when Linux used HLT
caused some of these systems to fail.
They were by far in the minority even back then."
Alan Cox further says:
"Also for the Cyrix 5510 which tended to go castors up if a HLT
occurred during a DMA cycle and on a few other boxes HLT during
DMA tended to go astray.
Do we care ? I doubt it. The 5510 was pretty obscure, the 5520
fixed it, the 5530 is probably the oldest still in any kind of
use."
So, let's finally drop this.
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Josh Boyer <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: "H. Peter Anvin" <[email protected]>
Acked-by: Alan Cox <[email protected]>
Cc: Stephen Hemminger <[email protected]
Cc: Linus Torvalds <[email protected]>
Cc: <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
[ If anyone cares then alternative instruction patching could be
used to replace HLT with a one-byte NOP instruction. Much simpler. ]
Signed-off-by: Ingo Molnar <[email protected]>
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Print physical address info in a style consistent with the %pR style used
elsewhere in the kernel.
Signed-off-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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An HP laptop (Pavilion G4-1016tx) has the following code in _TMP:
Store (\_SB.PCI0.LPCB.EC0.RTMP, Local0)
If (LGreaterEqual (Local0, S4TP))
{
Store (One, HTS4)
}
S4TP is initialised at 0 and not programmed further until either _HOT or
_CRT is called. If we evaluate _TMP before the trip points then HTS4 will
always be set, causing the firmware to generate a message on boot
complaining that the system shut down because of overheating. The simplest
solution is just to reverse the checking of trip points and _TMP in thermal
init.
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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acpi_dev_run_wake() is a generic function which can be used by
other subsystem too. Rename it to acpi_pm_device_run_wake, to be
consistent with acpi_pm_device_sleep_wake.
Then move it to ACPI core.
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull 2nd round of input updates from Dmitry Torokhov:
- update to Wacom driver to support wireless devices
- update to Sentelci touchpad driver to support newer hardware
- update to gpio-keys driver to support "interrupt-only" keys
- fixups to earlier commits
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: wacom - check for allocation failure in probe()
Input: tegra-kbc - allocate pdata before using it
Input: amijoy - add missing platform check
Input: wacom - wireless battery status
Input: wacom - create inputs when wireless connect
Input: wacom - wireless monitor framework
Input: wacom - isolate input registration
Input: sentelic - improve packet debugging information
Input: sentelic - minor code cleanup
Input: sentelic - enabling absolute coordinates output for newer hardware
Input: sentelic - refactor code for upcoming new hardware support
Input: gpio_keys - add support for interrupt only keys
Input: gpio_keys - consolidate key destructor code
Input: revert "gpio_keys - switch to using threaded IRQs"
Input: gpio_keys - constify platform data
Input: spear-keyboard - remove kbd_set_plat_data()
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If the state_count is not initialized for the device use
the driver's state count as the default. That will prevent
to add it manually in the cpuidle driver initialization
routine and will save us from duplicate line of code.
Signed-off-by: Daniel Lezcano <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Some C states of new CPU might be not good. One reason is BIOS might
configure them incorrectly. To help developers root cause it quickly, the
patch adds a new sysfs entry, so developers could disable specific C state
manually.
In addition, C state might have much impact on performance tuning, as it
takes much time to enter/exit C states, which might delay interrupt
processing. With the new debug option, developers could check if a deep C
state could impact performance and how much impact it could cause.
Also add this option in Documentation/cpuidle/sysfs.txt.
[[email protected]: check kstrtol return value]
Signed-off-by: ShuoX Liu <[email protected]>
Reviewed-by: Yanmin Zhang <[email protected]>
Reviewed-and-Tested-by: Deepthi Dharwar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Devices may share same list of power resources in _PR0, for example
Device(Dev0)
{
Name (_PR0, Package (0x01)
{
P0PR,
P1PR
})
}
Device(Dev1)
{
Name (_PR0, Package (0x01)
{
P0PR,
P1PR
}
}
Assume Dev0 and Dev1 were runtime suspended.
Then Dev0 is resumed first and it goes into D0 state.
But Dev1 is left in D0_Uninitialised state.
This is wrong. In this case, Dev1 must be resumed too.
In order to hand this case, each power resource maintains a list of
devices which relies on it.
When power resource is ON, it will check if the devices on its list
can be resumed. The device can only be resumed when all the power
resouces of its _PR0 are ON.
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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If a device has _PR3, it means the device supports D3_COLD.
Add the ability to validate and enter D3_COLD state in ACPI.
Signed-off-by: Zhang Rui <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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Repair a common problem with objects that are defined to return
a variable-length Package of sub-objects. If there is only one
sub-object, some BIOS code mistakenly simply declares the single
object instead of a Package with one sub-object. This function
attempts to repair this error by wrapping a Package object around
the original object, creating the correct and expected Package
with one sub-object.
Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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We accidentally removed the check for NULL in 3aac0ef10b "Input: wacom -
isolate input registration".
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Chris Bagwell <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
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Some ACPI interrupt actions may need to wait, and it's easiest to
have a thread context for this. So turn the ACPI interrupt
into a threaded interrupt.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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WARN() is not supposed to have side effects, so move the request_regions
outside.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Len Brown <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull arm-soc fixes from Olof Johansson:
"This is a first pass of some of the merge window fallout for ARM
platforms.
Nothing controversial:
- A system.h fallout fix for OMAP
- PXA fixes for breakage caused by the regulator struct changes
- GPIO fixes for OMAP to properly deal with dynamic IRQ allocation
- A mismerge in our arm-soc tree of an lpc32xx change for networking
- A fix for USB setup on tegra
- An undo of __init annotation of display mux setup on OMAP that's
needed at runtime"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: pxa: fix build issue on stargate2
ARM: pxa: fix build issue on cm-x300
ARM: pxa: fix build failure for regulator consumer in em-x270.c
ARM: LPC32xx: clock.c: Fix lpc-eth clock reference
ARM: OMAP: pm: fix compilation break
ARM: OMAP: Remove OMAP_GPIO_IRQ macro definition
drivers: input: Fix OMAP_GPIO_IRQ with gpio_to_irq() in ams_delta_serio_exit()
ARM: OMAP: boards: Fix OMAP_GPIO_IRQ usage with gpio_to_irq()
ARM: pxa: fix regulator related build fail in magician_defconfig
ARM: tegra: Fix device tree AUXDATA for USB/EHCI
ARM: OMAP2+: Remove __init from DSI mux functions
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x32 support for x86-64 from Ingo Molnar:
"This tree introduces the X32 binary format and execution mode for x86:
32-bit data space binaries using 64-bit instructions and 64-bit kernel
syscalls.
This allows applications whose working set fits into a 32 bits address
space to make use of 64-bit instructions while using a 32-bit address
space with shorter pointers, more compressed data structures, etc."
Fix up trivial context conflicts in arch/x86/{Kconfig,vdso/vma.c}
* 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (71 commits)
x32: Fix alignment fail in struct compat_siginfo
x32: Fix stupid ia32/x32 inversion in the siginfo format
x32: Add ptrace for x32
x32: Switch to a 64-bit clock_t
x32: Provide separate is_ia32_task() and is_x32_task() predicates
x86, mtrr: Use explicit sizing and padding for the 64-bit ioctls
x86/x32: Fix the binutils auto-detect
x32: Warn and disable rather than error if binutils too old
x32: Only clear TIF_X32 flag once
x32: Make sure TS_COMPAT is cleared for x32 tasks
fs: Remove missed ->fds_bits from cessation use of fd_set structs internally
fs: Fix close_on_exec pointer in alloc_fdtable
x32: Drop non-__vdso weak symbols from the x32 VDSO
x32: Fix coding style violations in the x32 VDSO code
x32: Add x32 VDSO support
x32: Allow x32 to be configured
x32: If configured, add x32 system calls to system call tables
x32: Handle process creation
x32: Signal-related system calls
x86: Add #ifdef CONFIG_COMPAT to <asm/sys_ia32.h>
...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull "ARM: cleanups of io includes" from Olof Johansson:
"Rob Herring has done a sweeping change cleaning up all of the
mach/io.h includes, moving some of the oft-repeated macros to a common
location and removing a bunch of boiler plate. This is another step
closer to a common zImage for multiple platforms."
Fix up various fairly trivial conflicts (<mach/io.h> removal vs changes
around it, tegra localtimer.o is *still* gone, yadda-yadda).
* tag 'cleanup2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (29 commits)
ARM: tegra: Include assembler.h in sleep.S to fix build break
ARM: pxa: use common IOMEM definition
ARM: dma-mapping: convert ARCH_HAS_DMA_SET_COHERENT_MASK to kconfig symbol
ARM: __io abuse cleanup
ARM: create a common IOMEM definition
ARM: iop13xx: fix missing declaration of iop13xx_init_early
ARM: fix ioremap/iounmap for !CONFIG_MMU
ARM: kill off __mem_pci
ARM: remove bunch of now unused mach/io.h files
ARM: make mach/io.h include optional
ARM: clps711x: remove unneeded include of mach/io.h
ARM: dove: add explicit include of dove.h to addr-map.c
ARM: at91: add explicit include of hardware.h to uncompressor
ARM: ep93xx: clean-up mach/io.h
ARM: tegra: clean-up mach/io.h
ARM: orion5x: clean-up mach/io.h
ARM: davinci: remove unneeded mach/io.h include
[media] davinci: remove includes of mach/io.h
ARM: OMAP: Remove remaining includes for mach/io.h
ARM: msm: clean-up mach/io.h
...
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Pull more ARM updates from Russell King.
This got a fair number of conflicts with the <asm/system.h> split, but
also with some other sparse-irq and header file include cleanups. They
all looked pretty trivial, though.
* 'for-linus' of git://git.linaro.org/people/rmk/linux-arm: (59 commits)
ARM: fix Kconfig warning for HAVE_BPF_JIT
ARM: 7361/1: provide XIP_VIRT_ADDR for no-MMU builds
ARM: 7349/1: integrator: convert to sparse irqs
ARM: 7259/3: net: JIT compiler for packet filters
ARM: 7334/1: add jump label support
ARM: 7333/2: jump label: detect %c support for ARM
ARM: 7338/1: add support for early console output via semihosting
ARM: use set_current_blocked() and block_sigmask()
ARM: exec: remove redundant set_fs(USER_DS)
ARM: 7332/1: extract out code patch function from kprobes
ARM: 7331/1: extract out insn generation code from ftrace
ARM: 7330/1: ftrace: use canonical Thumb-2 wide instruction format
ARM: 7351/1: ftrace: remove useless memory checks
ARM: 7316/1: kexec: EOI active and mask all interrupts in kexec crash path
ARM: Versatile Express: add NO_IOPORT
ARM: get rid of asm/irq.h in asm/prom.h
ARM: 7319/1: Print debug info for SIGBUS in user faults
ARM: 7318/1: gic: refactor irq_start assignment
ARM: 7317/1: irq: avoid NULL check in for_each_irq_desc loop
ARM: 7315/1: perf: add support for the Cortex-A7 PMU
...
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Pull a few PCMCIA updates from Dominik Brodowski.
Fix up trivial conflict (modified code in question had been removed) in
drivers/pcmcia/soc_common.c.
* git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia:
pcmcia at91_cf: fix raw gpio number usage
ARM: pxa: fix error handling in pxa2xx_drv_pcmcia_probe
pcmcia: Convert to DEFINE_PCI_DEVICE_TABLE
pcmcia: convert drivers/pcmcia/* to use module_platform_driver()
pcmcia: irq: Remove IRQF_DISABLED
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There has long been a limitation using software breakpoints with a
kernel compiled with CONFIG_DEBUG_RODATA going back to 2.6.26. For
this particular patch, it will apply cleanly and has been tested all
the way back to 2.6.36.
The kprobes code uses the text_poke() function which accommodates
writing a breakpoint into a read-only page. The x86 kgdb code can
solve the problem similarly by overriding the default breakpoint
set/remove routines and using text_poke() directly.
The x86 kgdb code will first attempt to use the traditional
probe_kernel_write(), and next try using a the text_poke() function.
The break point install method is tracked such that the correct break
point removal routine will get called later on.
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: [email protected] # >= 2.6.36
Inspried-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
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The do_fork and sys_open tests have never worked properly on anything
other than a UP configuration with the kgdb test suite. This is
because the test suite did not fully implement the behavior of a real
debugger. A real debugger tracks the state of what thread it asked to
single step and can correctly continue other threads of execution or
conditionally stop while waiting for the original thread single step
request to return.
Below is a simple method to cause a fatal kernel oops with the kgdb
test suite on a 2 processor ARM system:
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
echo V1I1F100 > /sys/module/kgdbts/parameters/kgdbts
Very soon after starting the test the kernel will start warning with
messages like:
kgdbts: BP mismatch c002487c expected c0024878
------------[ cut here ]------------
WARNING: at drivers/misc/kgdbts.c:317 check_and_rewind_pc+0x9c/0xc4()
[<c01f6520>] (check_and_rewind_pc+0x9c/0xc4)
[<c01f595c>] (validate_simple_test+0x3c/0xc4)
[<c01f60d4>] (run_simple_test+0x1e8/0x274)
The kernel will eventually recovers, but the test suite has completely
failed to test anything useful.
This patch implements behavior similar to a real debugger that does
not rely on hardware single stepping by using only software planted
breakpoints.
In order to mimic a real debugger, the kgdb test suite now tracks the
most recent thread that was continued (cont_thread_id), with the
intent to single step just this thread. When the response to the
single step request stops in a different thread that hit the original
break point that thread will now get continued, while the debugger
waits for the thread with the single step pending. Here is a high
level description of the sequence of events.
cont_instead_of_sstep = 0;
1) set breakpoint at do_fork
2) continue
3) Save the thread id where we stop to cont_thread_id
4) Remove breakpoint at do_fork
5) Reset the PC if needed depending on kernel exception type
6) soft single step
7) Check where we stopped
if current thread != cont_thread_id {
if (here for more than 2 times for the same thead) {
### must be a really busy system, start test again ###
goto step 1
}
goto step 5
} else {
cont_instead_of_sstep = 0;
}
8) clean up and run test again if needed
9) Clear out any threads that were waiting on a break point at the
point in time the test is ended with get_cont_catch(). This
happens sometimes because breakpoints are used in place of single
stepping and some threads could have been in the debugger exception
handling queue because breakpoints were hit concurrently on
different CPUs. This also means we wait at least one second before
unplumbing the debugger connection at the very end, so as respond
to any debug threads waiting to be serviced.
Cc: [email protected] # >= 3.0
Signed-off-by: Jason Wessel <[email protected]>
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The do_fork and sys_open tests have never worked properly on anything
other than a UP configuration with the kgdb test suite. This is
because the test suite did not fully implement the behavior of a real
debugger. A real debugger tracks the state of what thread it asked to
single step and can correctly continue other threads of execution or
conditionally stop while waiting for the original thread single step
request to return.
Below is a simple method to cause a fatal kernel oops with the kgdb
test suite on a 4 processor x86 system:
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
echo V1I1F1000 > /sys/module/kgdbts/parameters/kgdbts
Very soon after starting the test the kernel will oops with a message like:
kgdbts: BP mismatch 3b7da66480 expected ffffffff8106a590
WARNING: at drivers/misc/kgdbts.c:303 check_and_rewind_pc+0xe0/0x100()
Call Trace:
[<ffffffff812994a0>] check_and_rewind_pc+0xe0/0x100
[<ffffffff81298945>] validate_simple_test+0x25/0xc0
[<ffffffff81298f77>] run_simple_test+0x107/0x2c0
[<ffffffff81298a18>] kgdbts_put_char+0x18/0x20
The warn will turn to a hard kernel crash shortly after that because
the pc will not get properly rewound to the right value after hitting
a breakpoint leading to a hard lockup.
This change is broken up into 2 pieces because archs that have hw
single stepping (2.6.26 and up) need different changes than archs that
do not have hw single stepping (3.0 and up). This change implements
the correct behavior for an arch that supports hw single stepping.
A minor defect was fixed where sys_open should be do_sys_open
for the sys_open break point test. This solves the problem of running
a 64 bit with a 32 bit user space. The sys_open() never gets called
when using the 32 bit file system for the kgdb testsuite because the
32 bit binaries invoke the compat_sys_open() call leading to the test
never completing.
In order to mimic a real debugger, the kgdb test suite now tracks the
most recent thread that was continued (cont_thread_id), with the
intent to single step just this thread. When the response to the
single step request stops in a different thread that hit the original
break point that thread will now get continued, while the debugger
waits for the thread with the single step pending. Here is a high
level description of the sequence of events.
cont_instead_of_sstep = 0;
1) set breakpoint at do_fork
2) continue
3) Save the thread id where we stop to cont_thread_id
4) Remove breakpoint at do_fork
5) Reset the PC if needed depending on kernel exception type
6) if (cont_instead_of_sstep) { continue } else { single step }
7) Check where we stopped
if current thread != cont_thread_id {
cont_instead_of_sstep = 1;
goto step 5
} else {
cont_instead_of_sstep = 0;
}
8) clean up and run test again if needed
Cc: [email protected] # >= 2.6.26
Signed-off-by: Jason Wessel <[email protected]>
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On x86 the kgdb test suite will oops when the kernel is compiled with
CONFIG_DEBUG_RODATA and you run the tests after boot time. This is
regression has existed since 2.6.26 by commit: b33cb815 (kgdbts: Use
HW breakpoints with CONFIG_DEBUG_RODATA).
The test suite can use hw breakpoints for all the tests, but it has to
execute the hardware breakpoint specific tests first in order to
determine that the hw breakpoints actually work. Specifically the
very first test causes an oops:
# echo V1I1 > /sys/module/kgdbts/parameters/kgdbts
kgdb: Registered I/O driver kgdbts.
kgdbts:RUN plant and detach test
Entering kdb (current=0xffff880017aa9320, pid 1078) on processor 0 due to Keyboard Entry
[0]kdb> kgdbts: ERROR PUT: end of test buffer on 'plant_and_detach_test' line 1 expected OK got $E14#aa
WARNING: at drivers/misc/kgdbts.c:730 run_simple_test+0x151/0x2c0()
[...oops clipped...]
This commit re-orders the running of the tests and puts the RODATA
check into its own function so as to correctly avoid the kernel oops
by detecting and using the hw breakpoints.
Cc: <[email protected]> # >= 2.6.26
Signed-off-by: Jason Wessel <[email protected]>
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Pull slave-dmaengine update from Vinod Koul:
"This includes the cookie cleanup by Russell, the addition of context
parameter for dmaengine APIs, more arm dmaengine driver cleanup by
moving code to dmaengine, this time for imx by Javier and pl330 by
Boojin along with the usual driver fixes."
Fix up some fairly trivial conflicts with various other cleanups.
* 'next' of git://git.infradead.org/users/vkoul/slave-dma: (67 commits)
dmaengine: imx: fix the build failure on x86_64
dmaengine: i.MX: Fix merge of cookie branch.
dmaengine: i.MX: Add support for interleaved transfers.
dmaengine: imx-dma: use 'dev_dbg' and 'dev_warn' for messages.
dmaengine: imx-dma: remove 'imx_dmav1_baseaddr' and 'dma_clk'.
dmaengine: imx-dma: remove unused arg of imxdma_sg_next.
dmaengine: imx-dma: remove internal structure.
dmaengine: imx-dma: remove 'resbytes' field of 'internal' structure.
dmaengine: imx-dma: remove 'in_use' field of 'internal' structure.
dmaengine: imx-dma: remove sg member from internal structure.
dmaengine: imx-dma: remove 'imxdma_setup_sg_hw' function.
dmaengine: imx-dma: remove 'imxdma_config_channel_hw' function.
dmaengine: imx-dma: remove 'imxdma_setup_mem2mem_hw' function.
dmaengine: imx-dma: remove dma_mode member of internal structure.
dmaengine: imx-dma: remove data member from internal structure.
dmaengine: imx-dma: merge old dma-v1.c with imx-dma.c
dmaengine: at_hdmac: add slave config operation
dmaengine: add context parameter to prep_slave_sg and prep_dma_cyclic
dmaengine/dma_slave: introduce inline wrappers
dma: imx-sdma: Treat firmware messages as warnings instead of erros
...
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When a bonding device is configured with fail_over_mac=active,
we expect to see the MAC address of the new active slave as the source MAC
address after failover. But we see that the source MAC address is the MAC
address of previous active slave.
Emit NETDEV_CHANGEADDR event when bonding changes its MAC address, in order
to let arp_netdev_event flush neighbour cache and route cache.
How to reproduce this bug ?
-----------hostB----------------
hostA ----- switch ---|-- eth0--bond0(192.168.100.2/24)|
(192.168.100.1/24 \--|-- eth1-/ |
--------------------------------
1 on hostB,
modprobe bonding mode=1 miimon=500 fail_over_mac=active downdelay=1000
num_grat_arp=1
ifconfig bond0 192.168.100.2/24 up
ifenslave bond0 eth0
ifenslave bond0 eth1
then eth0 is the active slave, and MAC of bond0 is MAC of eth0.
2 on hostA, ping 192.168.100.2
3 on hostB,
tcpdump -i bond0 -p icmp -XXX
you will see bond0 uses MAC of eth0 as source MAC in icmp reply.
4 on hostB,
ifconfig eth0 down
tcpdump -i bond0 -p icmp -XXX (just keep it running in step 3)
you will see first bond0 uses MAC of eth1 as source MAC in icmp
reply, then it will use MAC of eth0 as source MAC.
Signed-off-by: Weiping Pan <[email protected]>
Signed-off-by: Jay Vosburgh <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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If a regulator with a supply is being unregistered we will call
regulator_put() to release the supply with the regulator_list_mutex held
but this deadlocks as regulator_put() takes the same lock. Fix this by
releasing the supply before we take the mutex in regulator_unregister().
Signed-off-by: Mark Brown <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer core updates from Thomas Gleixner.
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
ia64: vsyscall: Add missing paranthesis
alarmtimer: Don't call rtc_timer_init() when CONFIG_RTC_CLASS=n
x86: vdso: Put declaration before code
x86-64: Inline vdso clock_gettime helpers
x86-64: Simplify and optimize vdso clock_gettime monotonic variants
kernel-time: fix s/then/than/ spelling errors
time: remove no_sync_cmos_clock
time: Avoid scary backtraces when warning of > 11% adj
alarmtimer: Make sure we initialize the rtctimer
ntp: Fix leap-second hrtimer livelock
x86, tsc: Skip refined tsc calibration on systems with reliable TSC
rtc: Provide flag for rtc devices that don't support UIE
ia64: vsyscall: Use seqcount instead of seqlock
x86: vdso: Use seqcount instead of seqlock
x86: vdso: Remove bogus locking in update_vsyscall_tz()
time: Remove bogus comments
time: Fix change_clocksource locking
time: x86: Fix race switching from vsyscall to non-vsyscall clock
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git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes
From Tony Lindgren:
"This contains the updated gpio_to_irq patches from Tarun, and a trivial
build fix from Govindraj to #include <asm/system_misc.h> in pm.c.
The DSI mux patch is the same."
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP: pm: fix compilation break
ARM: OMAP: Remove OMAP_GPIO_IRQ macro definition
drivers: input: Fix OMAP_GPIO_IRQ with gpio_to_irq() in ams_delta_serio_exit()
ARM: OMAP: boards: Fix OMAP_GPIO_IRQ usage with gpio_to_irq()
ARM: OMAP2+: Remove __init from DSI mux functions
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Pull the intel i915 hibernation memory corruption fix from Dave Airlie:
"I tracked down the misc memory corruption after i915 hibernate to the
blinking fbcon cursor, and realised the i915 driver wasn't doing the
fbdev suspend/resume calls at all. nouveau and radeon have done these
calls for a long time.
This has been fairly well tested and is definitely the main culprit in
hibernate not working."
Yay.
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/i915: suspend fbdev device around suspend/hibernate
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Conflicts:
arch/arm/mach-omap1/board-htcherald.c
arch/arm/mach-omap2/board-rx51-peripherals.c
arch/arm/plat-omap/include/plat/gpio.h
drivers/input/serio/ams_delta_serio.c
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