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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Without this patch, ARM can not use SPLIT_PTLOCK_CPUS if
PREEMPT_RT_FULL=y because vectors_user_mapping() creates a
VM_ALWAYSDUMP mapping of the vector page (address 0xffff0000), but no
ptl->lock has been allocated for the page. An attempt to coredump
that page will result in a kernel NULL pointer dereference when
follow_page() attempts to lock the page.
The call tree to the NULL pointer dereference is:
do_notify_resume()
get_signal_to_deliver()
do_coredump()
elf_core_dump()
get_dump_page()
__get_user_pages()
follow_page()
pte_offset_map_lock() <----- a #define
...
rt_spin_lock()
The underlying problem is exposed by mm-shrink-the-page-frame-to-rt-size.patch.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Cc: Frank <Frank_Rowand@sonyusa.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/4E87C535.2030907@am.sony.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Use the local_irq_*_nort() variants.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Convert xtime_lock to raw_seqlock and fix up all users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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With threaded interrupts we might see an interrupt in progress on
migration. Do not unmask it when this is the case.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The machine might survive that problem and be at least in a state
which allows us to get more information about the problem.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Wrap the test for pagefault_disabled() into a helper, this allows us
to remove the need for current->pagefault_disabled on !-rt kernels.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-3yy517m8zsi9fpsf14xfaqkw@git.kernel.org
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Necessary for decoupling pagefault disable from preempt count.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Setup and remove the interrupt handler in clock event mode selection.
This avoids calling the (shared) interrupt handler when the device is
not used.
Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Coccinelle based conversion.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The arm boot_lock is used by the secondary processor startup code. The locking
task is the idle thread, which has idle->sched_class == &idle_sched_class.
idle_sched_class->enqueue_task == NULL, so if the idle task blocks on the
lock, the attempt to wake it when the lock becomes available will fail:
try_to_wake_up()
...
activate_task()
enqueue_task()
p->sched_class->enqueue_task(rq, p, flags)
Fix by converting boot_lock to a raw spin lock.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Link: http://lkml.kernel.org/r/4E77B952.3010606@am.sony.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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All timer interrupts and the perf interrupt are marked NO_THREAD, so
its safe to allow forced interrupt threading.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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PMU interrupt must not be threaded. Remove IRQF_DISABLED while at it
as we run all handlers with interrupts disabled anyway.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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All interrupts which must be non threaded are marked
IRQF_NO_THREAD. So it's safe to allow force threaded handlers.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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IPI handlers cannot be threaded. Remove the obsolete IRQF_DISABLED
flag (see commit e58aa3d2) while at it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cascade handlers must run in hard interrupt context.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cascade interrupt must run in hard interrupt context.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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This is to exclude it from force threading to allow RT patch set to work.
And while on this line
* Remove IRQF_DISABLED as as this flag is NOOP
* Add IRQF_PERCPU as this is a per cpu interrupt.
Signed-off-by: Venkat Subbiah <venkat.subbiah@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
Link: http://lkml.kernel.org/r/1317673870-10671-1-git-send-email-venkat.subbiah@caviumnetworks.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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MSI based per cpu timers lose interrupts when intel_idle() is enabled
- independent of the c-state. With idle=poll the problem cannot be
observed. We have no idea yet, whether this is a W510 specific issue
or a general chipset oddity. Blacklist the known problem machine.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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The CONFIG_PREEMPT=n section of setup_singlestep() contains:
preempt_enable_no_resched();
That's bogus as it is asymetric - no preempt_disable() - and it just
never blew up because preempt_enable_no_resched() is a NOP when
CONFIG_PREEMPT=n. Remove it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Interrupts notify the idle exit state before calling irq_enter(). But
the notifier code calls rcu_read_lock() and this is not allowed while
rcu is in an extended quiescent state. We need to wait for
rcu_irq_enter() to be called before doing so otherwise this results in
a grumpy RCU:
[ 0.099991] WARNING: at include/linux/rcupdate.h:194 __atomic_notifier_call_chain+0xd2/0x110()
[ 0.099991] Hardware name: AMD690VM-FMH
[ 0.099991] Modules linked in:
[ 0.099991] Pid: 0, comm: swapper Not tainted 3.0.0-rc6+ #255
[ 0.099991] Call Trace:
[ 0.099991] <IRQ> [<ffffffff81051c8a>] warn_slowpath_common+0x7a/0xb0
[ 0.099991] [<ffffffff81051cd5>] warn_slowpath_null+0x15/0x20
[ 0.099991] [<ffffffff817d6fa2>] __atomic_notifier_call_chain+0xd2/0x110
[ 0.099991] [<ffffffff817d6ff1>] atomic_notifier_call_chain+0x11/0x20
[ 0.099991] [<ffffffff81001873>] exit_idle+0x43/0x50
[ 0.099991] [<ffffffff81020439>] smp_apic_timer_interrupt+0x39/0xa0
[ 0.099991] [<ffffffff817da253>] apic_timer_interrupt+0x13/0x20
[ 0.099991] <EOI> [<ffffffff8100ae67>] ? default_idle+0xa7/0x350
[ 0.099991] [<ffffffff8100ae65>] ? default_idle+0xa5/0x350
[ 0.099991] [<ffffffff8100b19b>] amd_e400_idle+0x8b/0x110
[ 0.099991] [<ffffffff810cb01f>] ? rcu_enter_nohz+0x8f/0x160
[ 0.099991] [<ffffffff810019a0>] cpu_idle+0xb0/0x110
[ 0.099991] [<ffffffff817a7505>] rest_init+0xe5/0x140
[ 0.099991] [<ffffffff817a7468>] ? rest_init+0x48/0x140
[ 0.099991] [<ffffffff81cc5ca3>] start_kernel+0x3d1/0x3dc
[ 0.099991] [<ffffffff81cc5321>] x86_64_start_reservations+0x131/0x135
[ 0.099991] [<ffffffff81cc5412>] x86_64_start_kernel+0xed/0xf4
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20110929194047.GA10247@linux.vnet.ibm.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andy Henroid <andrew.d.henroid@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
arm/imx: fix imx6q mmc error when mounting rootfs
arm/imx: fix AUTO_ZRELADDR selection
arm/imx: fix the references to ARCH_MX3
ARM: mx51/53: set pwm clock parent to ipg_perclk
arm/tegra: enable headphone detection gpio on seaboard
arm/dt: Fix ventana SDHCI power-gpios
arm/tegra: Don't create duplicate gpio and pinmux devices
ARM: at91: Fix USBA gadget registration
atmel/spi: fix missing probe
at91/yl-9200: Fix section mismatch
at91: vmalloc fix missing AT91_VIRT_BASE define
ARM: at91: usart: drop static map regs for dbgu
ARM: picoxcell: add extra temp register to addruart
ARM: msm: fix compilation flags for MSM_SCM
arm/mxs: fix mmc device adding for mach-mx28evk
ARM: mxc: Remove test_for_ltirq
ARM:i.MX: fix build error in clock-mx51-mx53.c
ARM:i.MX: fix build error in tzic/avic.c
ARM: mxc: fix local timer interrupt handling
msm: boards: Fix fallout from removal of machine_desc in fixup
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git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k: (29 commits)
m68k/mac: Remove mac_irq_{en,dis}able() wrappers
m68k/irq: Remove obsolete support for user vector interrupt fixups
m68k/irq: Remove obsolete m68k irq framework
m68k/q40: Convert Q40/Q60 to genirq
m68k/sun3: Convert Sun3/3x to genirq
m68k/sun3: Use the kstat_irqs_cpu() wrapper
m68k/apollo: Convert Apollo to genirq
m68k/vme: Convert VME to genirq
m68k/hp300: Convert HP9000/300 and HP9000/400 to genirq
m68k/mac: Optimize interrupts using chain handlers
m68k/mac: Convert Mac to genirq
m68k/amiga: Optimize interrupts using chain handlers
m68k/amiga: Convert Amiga to genirq
m68k/amiga: Refactor amiints.c
m68k/atari: Remove code and comments about different irq types
m68k/atari: Convert Atari to genirq
m68k/irq: Add genirq support
m68k/irq: Remove obsolete IRQ_FLG_* users
m68k/irq: Rename {,__}m68k_handle_int()
m68k/irq: Add m68k_setup_irq_controller()
...
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git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc/kvm: Fix build failure with HV KVM and CBE
powerpc/ps3: Fix lv1_gpu_attribute hcall
powerpc/ps3: Fix PS3 repository build warnings
powerpc/ps3: irq: Remove IRQF_DISABLED
powerpc/irq: Remove IRQF_DISABLED
powerpc/numa: NUMA topology support for PowerNV
powerpc: Add System RAM to /proc/iomem
powerpc: Add KVM as module to defconfigs
powerpc/kvm: Fix build with older toolchains
powerpc, tqm5200: update tqm5200_defconfig to fit for charon board.
powerpc/5200: add support for charon board
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git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
kbuild: Fix missing system calls check on mips.
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This needed the sfi IRQ 0xFF fix to go in first. It simply plumbs in the
bma023 driver with the firmware naming of it.
Signed-off-by: William Douglas <william.douglas@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Real world year equals the value in vrtc YEAR register plus an offset.
We used 1960 as the offset to make leap year consistent, but for a
device's first use, its YEAR register is 0 and the system year will
be parsed as 1960 which is not a valid UNIX time and will cause many
applications to fail mysteriously. So we use 1972 instead to fix this
issue.
Updated patch which adds a sanity check suggested by Mathias
This isn't a change in behaviour for systems, because 1972 is the one we
actually use. It's the old version in upstream which is out of sync with
all devices.
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Fix a build error. CE4100 with no serial errors because the alternate
function is only a prototype not a null function as intended.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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into fixes
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git://git.pengutronix.de/git/imx/linux-2.6 into fixes
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The following error is seen in some case when mounting rootfs from
SD/MMC cards.
Waiting for root device /dev/mmcblk0p1...
mmc1: host does not support reading read-only switch. assuming write-enable.
mmc1: new high speed SDHC card at address b368
mmcblk0: mmc1:b368 SDC 3.74 GiB
mmcblk0: p1
mmc1: Timeout waiting for hardware interrupt.
mmcblk0: error -110 transferring data, sector 3678224, nr 40, cmd response 0x900, card status 0xc00
end_request: I/O error, dev mmcblk0, sector 3678225
Buffer I/O error on device mmcblk0p1, logical block 458754
lost page write due to I/O error on mmcblk0p1
This patch fixes the problem by lowering the usdhc clock and correcting
watermark configuration.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The AUTO_ZRELADDR selection for ARCH_IMX_V4_V5 and ARCH_MX5 should
really be mutually exclusive to ZBOOT_ROM just like what ARCH_IMX_V6_V7
does.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The config symbol ARCH_MX3 has been removed by commit 'a89cf59
arm/imx: merge i.MX3 and i.MX6', and it should not be referenced
any more.
The patch also change ARCH_MX* to SOC_IMX* for other platforms.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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into fixes
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git://git.kernel.org/pub/scm/linux/kernel/git/olof/tegra into fixes
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Enable the headphone detection gpio on tegra platform.
Signed-off-by: Yufeng Shen <miletus@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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Ventana uses the same SDHCI GPIOs as Seaboard; PI6 (70) is the power GPIO
for the SD port, and there is no power GPIO for the MMC chip.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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*_pinmux_init() register the GPIO and pinmux devices so that they're ready
before any other device needs them.
*_pinmux_init() are also called by board-dt.c in order to set up the GPIO
and pinmux configurations. In this case, if we register the devices, they
end up being probed once due to this registration, and a second time due
to a device-tree node (or vice-versa). The second probe fails since the
memory regions are already requested. Besides, we don't actually want the
duplicated devices.
To avoid this duplicate registration, modify *_pinmux_init() to check
whether it's running on a DT machine. If not, register the pinmux devices.
If so, don't register them.
Finally, modify board-dt.c to call the *_pinmux_init() after all devices have
been instantiated from device-tree. This allows the GPIO and pinmux devices
to be instantiated and initialized before calling functions to configure the
hardware.
This has one disadvantage: The pinmux and GPIO initialization now happens
after /all/ devices are instantiated, rather than after just gpio and
pinmux but before anything else. So the correct HW configuration is not
in place when e.g. the SD/MMC device is probed. Long-term, this should be
solved by doing both:
a) Initializing the HW state from DT nodes during GPIO and pinmux device
probe.
b) Using the deferred driver probe mechanism, so that drivers can defer
their probe until after the gpio and pinmux drivers have probed.
v2: s/int is_dt/bool is_dt/
v3: Use of_machine_is_compatible inside *_pinmux_init() rather than passing
an explicit parameter into the function from outside.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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git://git.linaro.org/people/shawnguo/linux-2.6 into fixes
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into fixes
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Since 193ab2a6070039e7ee2b9b9bebea754a7c52fd1b, various AT91 boards don't
register USBA adapters anymore due to depending on a now non-existing
symbol. Fix the symbol name.
Signed-off-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
CC: stable@kernel.org
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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