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Since mdscr_el1 is part of the debug register group, it is highly likely
to be trapped by a hypervisor to prevent virtual machines from debugging
(buggering?) each other. Unfortunately, this absolutely destroys our
performance, since we access the register on many of our low-level
fault handling paths to keep track of the various debug state machines.
This patch removes our dependency on mdscr_el1 in the case that debugging
is not being used. More specifically we:
- Use TIF_SINGLESTEP to indicate that a task is stepping at EL0 and
avoid disabling step in the MDSCR when we don't need to.
MDSCR_EL1.SS handling is moved to kernel_entry, when trapping from
userspace.
- Ensure debug exceptions are re-enabled on *all* exception entry
paths, even the debug exception handling path (where we re-enable
exceptions after invoking the handler). Since we can now rely on
MDSCR_EL1.SS being cleared by the entry code, exception handlers can
usually enable debug immediately before enabling interrupts.
- Remove all debug exception unmasking from ret_to_user and
el1_preempt, since we will never get here with debug exceptions
masked.
This results in a slight change to kernel debug behaviour, where we now
step into interrupt handlers and data aborts from EL1 when debugging the
kernel, which is actually a useful thing to do. A side-effect of this is
that it *does* potentially prevent stepping off {break,watch}points when
there is a high-frequency interrupt source (e.g. a timer), so a debugger
would need to use either breakpoints or manually disable interrupts to
get around this issue.
With this patch applied, guest performance is restored under KVM when
debug register accesses are trapped (and we get a measurable performance
increase on the host on Cortex-A57 too).
Cc: Ian Campbell <ian.campbell@citrix.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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In order to ensure ordering and completion of inner-shareable maintenance
instructions (cache and TLB) on AArch64, we can use the -ish suffix to
the dmb and dsb instructions respectively.
This patch updates our low-level cache and tlb maintenance routines to
use the inner-shareable barrier variants where appropriate.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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In order to ensure completion of inner-shareable maintenance instructions
(cache and TLB) on AArch64, we can use the -ish suffix to the dsb
instruction.
This patch relaxes our dsb sy instructions to dsb ish where possible.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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set_cpu_boot_mode_flag is used to identify which exception levels are
encountered across the system by CPUs trying to enter the kernel. The
basic algorithm is: if a CPU is booting at EL2, it will set a flag at
an offset of #4 from __boot_cpu_mode, a cacheline-aligned variable.
Otherwise, a flag is set at an offset of zero into the same cacheline.
This enables us to check that all CPUs booted at the same exception
level.
This cacheline is written with the stage-1 MMU off (that is, via a
strongly-ordered mapping) and will bypass any clean lines in the cache,
leading to potential coherence problems when the variable is later
checked via the normal, cacheable mapping of the kernel image.
This patch reworks the broken flushing code so that we:
(1) Use a DMB to order the strongly-ordered write of the cacheline
against the subsequent cache-maintenance operation (by-VA
operations only hazard against normal, cacheable accesses).
(2) Use a single dc ivac instruction to invalidate any clean lines
containing a stale copy of the line after it has been updated.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The recently introduced acquire/release accessors refer to smp_mb()
in the !CONFIG_SMP case. This is confusing when reading the code, so use
barrier() directly when we know we're UP.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Now that all callers of the barrier macros are updated to pass the
mandatory options, update the macros so the option is actually used.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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When calling our low-level barrier macros directly, we can often suffice
with more relaxed behaviour than the default "all accesses, full system"
option.
This patch updates the users of dsb() to specify the option which they
actually require.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The tlb maintainence functions: __cpu_flush_user_tlb_range and
__cpu_flush_kern_tlb_range do not take into consideration the page
granule when looping through the address range, and repeatedly flush
tlb entries for the same page when operating with 64K pages.
This patch re-works the logic s.t. we instead advance the loop by
1 << (PAGE_SHIFT - 12), so avoid repeating ourselves.
Also the routines have been converted from assembler to static inline
functions to aid with legibility and potential compiler optimisations.
The isb() has been removed from flush_tlb_kernel_range(.) as it is
only needed when changing the execute permission of a mapping. If one
needs to set an area of the kernel as execute/non-execute an isb()
must be inserted after the call to flush_tlb_kernel_range.
Cc: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Some users of xchg() don't bother using the return value, which results
in a compiler warning like the following (from kgdb):
In file included from linux/arch/arm64/include/asm/atomic.h:27:0,
from include/linux/atomic.h:4,
from include/linux/spinlock.h:402,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/uapi/linux/timex.h:56,
from include/linux/timex.h:56,
from include/linux/sched.h:19,
from include/linux/pid_namespace.h:4,
from kernel/debug/debug_core.c:30:
kernel/debug/debug_core.c: In function ‘kgdb_cpu_enter’:
linux/arch/arm64/include/asm/cmpxchg.h:75:3: warning: value computed is not used [-Wunused-value]
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
^
linux/arch/arm64/include/asm/atomic.h:132:30: note: in expansion of macro ‘xchg’
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
kernel/debug/debug_core.c:504:4: note: in expansion of macro ‘atomic_xchg’
atomic_xchg(&kgdb_active, cpu);
^
This patch makes use of the same trick as we do for cmpxchg, by assigning
the return value to a dummy variable in the xchg() macro itself.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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We have the capability to map 1GB level 1 blocks when using a 4K
granule.
This patch adjusts the create_mapping logic s.t. when mapping physical
memory on boot, we attempt to use a 1GB block if both the VA and PA
start and end are 1GB aligned. This both reduces the levels of lookup
required to resolve a kernel logical address, as well as reduces TLB
pressure on cores that support 1GB TLB entries.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Tested-by: Jungseok Lee <jays.lee@samsung.com>
[catalin.marinas@arm.com: s/prot_sect_kernel/PROT_SECT_NORMAL_EXEC/]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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arm64 sets CONFIG_64BIT=y and hence uses the "long counter" atomic64_t
definition from include/linux/types.h. Make atomic64_read() return "long",
not "long long".
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The primary aim of this patchset is to remove the pgprot_default and
prot_sect_default global variables and rely strictly on predefined
values. The original goal was to be able to run SMP kernels on UP
hardware by not setting the Shareability bit. However, it is unlikely to
see UP ARMv8 hardware and even if we do, the Shareability bit is no
longer assumed to disable cacheable accesses.
A side effect is that the device mappings now have the Shareability
attribute set. The hardware, however, should ignore it since Device
accesses are always Outer Shareable.
Following the removal of the two global variables, there is some PROT_*
macro reshuffling and cleanup, including the __PAGE_* macros (replaced
by PAGE_*).
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
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The ARMv8 architecture allows execute-only user permissions by clearing
the PTE_UXN and PTE_USER bits. The kernel, however, can still access
such page, so execute-only page permission does not protect against
read(2)/write(2) etc. accesses. Systems requiring such protection must
implement/enable features like SECCOMP.
This patch changes the arm64 __P100 and __S100 protection_map[] macros
to the new __PAGE_EXECONLY attributes. A side effect is that
pte_valid_user() no longer triggers for __PAGE_EXECONLY since PTE_USER
isn't set. To work around this, the check is done on the PTE_NG bit via
the pte_valid_ng() macro. VM_READ is also checked now for page faults.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This information is useful for instruction emulators to detect
read/write and access size without having to decode the faulting
instruction. The current patch exports it via sigcontext (struct
esr_context) and is only valid for SIGSEGV and SIGBUS.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This patch removes the aux_context structure (and the containing file)
to allow the placement of the _aarch64_ctx end magic based on the
context stored on the signal stack.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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For AArch32, bit 11 (WnR) of the FSR/ESR register is set when the fault
was caused by a write access and applications like Qemu rely on such
information being provided in sigcontext. This patch introduces the
ESR_EL1 tracking for the arm64 kernel faults and sets bit 11 accordingly
in compat sigcontext.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The synchronisation with the boot thread already happens in __cpu_up()
via wait_for_completion_timeout(). In addition, __cpu_up() calls are
protected by the cpu_add_remove_lock mutex and already serialised.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The hardware provides the maximum cache line size in the system via the
CTR_EL0.CWG bits. This patch implements the cache_line_size() function
to read such information, together with a sanity check if the statically
defined L1_CACHE_BYTES is smaller than the hardware value.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
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Pull file locking change from Jeff Layton:
"Only an email address change to the MAINTAINERS file"
* tag 'locks-v3.15-3' of git://git.samba.org/jlayton/linux:
MAINTAINERS: email address change for Jeff Layton
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
"These are mostly arm64 fixes with an additional arm(64) platform fix
for the initialisation of vexpress clocks (the latter only affecting
arm64; the arch/arm64 code is SoC agnostic and does not rely on early
SoC-specific calls)
- vexpress platform clocks initialisation moved earlier following the
arm64 move of of_clk_init() call in a previous commit
- Default DMA ops changed to non-coherent to preserve compatibility
with 32-bit ARM DT files. The "dma-coherent" property can be used
to explicitly mark a device coherent. The Applied Micro DT file
has been updated to avoid DMA cache maintenance for the X-Gene SATA
controller (the only arm64 related driver with such assumption in
-rc mainline)
- Fixmap correction for earlyprintk
- kern_addr_valid() fix for huge pages"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
vexpress: Initialise the sysregs before setting up the clocks
arm64: Mark the Applied Micro X-Gene SATA controller as DMA coherent
arm64: Use bus notifiers to set per-device coherent DMA ops
arm64: Make default dma_ops to be noncoherent
arm64: fixmap: fix missing sub-page offset for earlyprintk
arm64: Fix for the arm64 kern_addr_valid() function
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"This is two patches both fixing bugs in drivers (virtio-scsi and
mpt2sas) causing an oops in certain circumstances"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
[SCSI] virtio-scsi: Skip setting affinity on uninitialized vq
[SCSI] mpt2sas: Don't disable device twice at suspend.
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Following arm64 commit bc3ee18a7a57 (arm64: init: Move of_clk_init to
time_init()), vexpress_osc_of_setup() is called via of_clk_init() long
before initcalls are issued. Initialising the vexpress oscillators
requires the vespress sysregs to be already initialised, so this patch
adds an explicit call to vexpress_sysreg_of_early_init() in vexpress
oscillator setup function.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Cc: Mike Turquette <mturquette@linaro.org>
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Since the default DMA ops for arm64 are non-coherent, mark the X-Gene
controller explicitly as dma-coherent to avoid additional cache
maintenance.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Loc Ho <lho@apm.com>
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Recently, the default DMA ops have been changed to non-coherent for
alignment with 32-bit ARM platforms (and DT files). This patch adds bus
notifiers to be able to set the coherent DMA ops (with no cache
maintenance) for devices explicitly marked as coherent via the
"dma-coherent" DT property.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Currently arm64 dma_ops is by default made coherent which makes it
opposite in default policy from arm.
Make default dma_ops to be noncoherent (same as arm), as currently there
aren't any dma-capable drivers which assumes coherent ops
Signed-off-by: Ritesh Harjani <ritesh.harjani@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Commit d57c33c5daa4 (add generic fixmap.h) added (among other
similar things) set_fixmap_io to deal with early ioremap of devices.
More recently, commit bf4b558eba92 (arm64: add early_ioremap support)
converted the arm64 earlyprintk to use set_fixmap_io. A side effect of
this conversion is that my virtual machines have stopped booting when
I pass "earlyprintk=uart8250-8bit,0x3f8" to the guest kernel.
Turns out that the new earlyprintk code doesn't care at all about
sub-page offsets, and just assumes that the earlyprintk device will
be page-aligned. Obviously, that doesn't play well with the above example.
Further investigation shows that set_fixmap_io uses __set_fixmap instead
of __set_fixmap_offset. A fix is to introduce a set_fixmap_offset_io that
uses the latter, and to remove the superflous call to fix_to_virt
(which only returns the value that set_fixmap_io has already given us).
With this applied, my VMs are back in business. Tested on a Cortex-A57
platform with kvmtool as platform emulation.
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Fix for the arm64 kern_addr_valid() function to recognize
virtual addresses in the kernel logical memory map. The
function fails as written because it does not check whether
the addresses in that region are mapped at the pmd level to
2MB or 512MB pages, continues the page table walk to the
pte level, and issues a garbage value to pfn_valid().
Tested on 4K-page and 64K-page kernels.
Signed-off-by: Dave Anderson <anderson@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fixes from Thomas Gleixner:
"This udpate delivers:
- A fix for dynamic interrupt allocation on x86 which is required to
exclude the GSI interrupts from the dynamic allocatable range.
This was detected with the newfangled tablet SoCs which have GPIOs
and therefor allocate a range of interrupts. The MSI allocations
already excluded the GSI range, so we never noticed before.
- The last missing set_irq_affinity() repair, which was delayed due
to testing issues
- A few bug fixes for the armada SoC interrupt controller
- A memory allocation fix for the TI crossbar interrupt controller
- A trivial kernel-doc warning fix"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip: irq-crossbar: Not allocating enough memory
irqchip: armanda: Sanitize set_irq_affinity()
genirq: x86: Ensure that dynamic irq allocation does not conflict
linux/interrupt.h: fix new kernel-doc warnings
irqchip: armada-370-xp: Fix releasing of MSIs
irqchip: armada-370-xp: implement the ->check_device() msi_chip operation
irqchip: armada-370-xp: fix invalid cast of signed value into unsigned variable
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Thomas Gleixner:
"This update brings along:
- Two fixes for long standing bugs in the hrtimer code, one which
prevents remote enqueuing and the other preventing arbitrary delays
after a interrupt hang was detected
- A fix in the timer wheel which prevents math overflow
- A fix for a long standing issue with the architected ARM timer
related to the C3STOP mechanism.
- A trivial compile fix for nspire SoC clocksource"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
timer: Prevent overflow in apply_slack
hrtimer: Prevent remote enqueue of leftmost timers
hrtimer: Prevent all reprogramming if hang detected
clocksource: nspire: Fix compiler warning
clocksource: arch_arm_timer: Fix age-old arch timer C3STOP detection issue
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git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fix from Steven Rostedt:
"This is a small fix where the trigger code used the wrong
rcu_dereference(). It required rcu_dereference_sched() instead of the
normal rcu_dereference(). It produces a nasty RCU lockdep splat due
to the incorrect rcu notation"
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* tag 'trace-fixes-v3.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Use rcu_dereference_sched() for trace event triggers
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As trace event triggers are now part of the mainline kernel, I added
my trace event trigger tests to my test suite I run on all my kernels.
Now these tests get run under different config options, and one of
those options is CONFIG_PROVE_RCU, which checks under lockdep that
the rcu locking primitives are being used correctly. This triggered
the following splat:
===============================
[ INFO: suspicious RCU usage. ]
3.15.0-rc2-test+ #11 Not tainted
-------------------------------
kernel/trace/trace_events_trigger.c:80 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
4 locks held by swapper/1/0:
#0: ((&(&j_cdbs->work)->timer)){..-...}, at: [<ffffffff8104d2cc>] call_timer_fn+0x5/0x1be
#1: (&(&pool->lock)->rlock){-.-...}, at: [<ffffffff81059856>] __queue_work+0x140/0x283
#2: (&p->pi_lock){-.-.-.}, at: [<ffffffff8106e961>] try_to_wake_up+0x2e/0x1e8
#3: (&rq->lock){-.-.-.}, at: [<ffffffff8106ead3>] try_to_wake_up+0x1a0/0x1e8
stack backtrace:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.15.0-rc2-test+ #11
Hardware name: /DG965MQ, BIOS MQ96510J.86A.0372.2006.0605.1717 06/05/2006
0000000000000001 ffff88007e083b98 ffffffff819f53a5 0000000000000006
ffff88007b0942c0 ffff88007e083bc8 ffffffff81081307 ffff88007ad96d20
0000000000000000 ffff88007af2d840 ffff88007b2e701c ffff88007e083c18
Call Trace:
<IRQ> [<ffffffff819f53a5>] dump_stack+0x4f/0x7c
[<ffffffff81081307>] lockdep_rcu_suspicious+0x107/0x110
[<ffffffff810ee51c>] event_triggers_call+0x99/0x108
[<ffffffff810e8174>] ftrace_event_buffer_commit+0x42/0xa4
[<ffffffff8106aadc>] ftrace_raw_event_sched_wakeup_template+0x71/0x7c
[<ffffffff8106bcbf>] ttwu_do_wakeup+0x7f/0xff
[<ffffffff8106bd9b>] ttwu_do_activate.constprop.126+0x5c/0x61
[<ffffffff8106eadf>] try_to_wake_up+0x1ac/0x1e8
[<ffffffff8106eb77>] wake_up_process+0x36/0x3b
[<ffffffff810575cc>] wake_up_worker+0x24/0x26
[<ffffffff810578bc>] insert_work+0x5c/0x65
[<ffffffff81059982>] __queue_work+0x26c/0x283
[<ffffffff81059999>] ? __queue_work+0x283/0x283
[<ffffffff810599b7>] delayed_work_timer_fn+0x1e/0x20
[<ffffffff8104d3a6>] call_timer_fn+0xdf/0x1be^M
[<ffffffff8104d2cc>] ? call_timer_fn+0x5/0x1be
[<ffffffff81059999>] ? __queue_work+0x283/0x283
[<ffffffff8104d823>] run_timer_softirq+0x1a4/0x22f^M
[<ffffffff8104696d>] __do_softirq+0x17b/0x31b^M
[<ffffffff81046d03>] irq_exit+0x42/0x97
[<ffffffff81a08db6>] smp_apic_timer_interrupt+0x37/0x44
[<ffffffff81a07a2f>] apic_timer_interrupt+0x6f/0x80
<EOI> [<ffffffff8100a5d8>] ? default_idle+0x21/0x32
[<ffffffff8100a5d6>] ? default_idle+0x1f/0x32
[<ffffffff8100ac10>] arch_cpu_idle+0xf/0x11
[<ffffffff8107b3a4>] cpu_startup_entry+0x1a3/0x213
[<ffffffff8102a23c>] start_secondary+0x212/0x219
The cause is that the triggers are protected by rcu_read_lock_sched() but
the data is dereferenced with rcu_dereference() which expects it to
be protected with rcu_read_lock(). The proper reference should be
rcu_dereference_sched().
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management fixes from Rafael Wysocki:
"A bunch of regression fixes this time. They fix two regressions in
the PNP subsystem, one in the ACPI processor driver and one in the
ACPI EC driver, four cpufreq driver regressions and an unrelated bug
in one of the drivers. The regressions are recent or introduced in
3.14.
Specifics:
- There are two bugs in the ACPI PNP core that cause errors to be
returned if optional ACPI methods are not present. After an ACPI
core change made in 3.14 one of those errors leads to serial port
suspend failures on some systems. Fix from Rafael J Wysocki.
- A recently added PNP quirk related to Intel chipsets intorduced a
build error in unusual configurations (PNP without PCI). Fix from
Bjorn Helgaas.
- An ACPI EC workaround related to system suspend on Samsung machines
added in 3.14 introduced a race causing some valid EC events to be
discarded. Fix from Kieran Clancy.
- The acpi-cpufreq driver fails to load on some systems after a 3.14
commit related to APIC ID parsing that overlooked one corner case.
Fix from Lan Tianyu.
- Fix for a recently introduced build problem in the ppc-corenet
cpufreq driver from Tim Gardner.
- A recent cpufreq core change to ensure serialization of frequency
transitions for drivers with a ->target_index() callback overlooked
the fact that some of those drivers had been doing operations
introduced by it into the core already by themselves. That
resulted in a mess in which the core and the drivers try to do the
same thing and block each other which leads to deadlocks. Fixes
for the powernow-k7, powernow-k6, and longhaul cpufreq drivers from
Srivatsa S Bhat.
- Fix for a computational error in the powernow-k6 cpufreq driver
from Srivatsa S Bhat"
* tag 'pm+acpi-3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / processor: Fix failure of loading acpi-cpufreq driver
PNP / ACPI: Do not return errors if _DIS or _SRS are not present
PNP: Fix compile error in quirks.c
ACPI / EC: Process rather than discard events in acpi_ec_clear
cpufreq: ppc-corenet-cpufreq: Fix __udivdi3 modpost error
cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
cpufreq: powernow-k6: Fix double invocation of cpufreq_freq_transition_begin/end
cpufreq: powernow-k6: Fix incorrect comparison with max_multipler
cpufreq: longhaul: Fix double invocation of cpufreq_freq_transition_begin/end
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Pull driver core deferred probe fix from Grant Likely:
"Drivercore race condition fix (exposed by devicetree)
This branch fixes a bug where a device can get stuck in the deferred
list even though all its dependencies are met. The bug has existed
for a long time, but new platform conversions to device tree have
exposed it. This patch is needed to get those platforms working.
This was the pending bug fix I mentioned in my previous pull request.
Normally this would go through Greg's tree seeing that it is a
drivercore change, but devicetree exposes the problem. I've discussed
with Greg and he okayed me asking you to pull directly"
* tag 'dt-for-linus' of git://git.secretlab.ca/git/linux:
drivercore: deferral race condition fix
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* acpi-ec:
ACPI / EC: Process rather than discard events in acpi_ec_clear
* acpi-processor:
ACPI / processor: Fix failure of loading acpi-cpufreq driver
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* pnp:
PNP / ACPI: Do not return errors if _DIS or _SRS are not present
PNP: Fix compile error in quirks.c
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* pm-cpufreq:
cpufreq: ppc-corenet-cpufreq: Fix __udivdi3 modpost error
cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
cpufreq: powernow-k6: Fix double invocation of cpufreq_freq_transition_begin/end
cpufreq: powernow-k6: Fix incorrect comparison with max_multipler
cpufreq: longhaul: Fix double invocation of cpufreq_freq_transition_begin/end
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git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper fixes from Mike Snitzer:
"A few dm-thinp fixes for changes merged in 3.15-rc1.
A dm-verity fix for an immutable biovec regression that affects 3.14+.
A dm-cache fix to properly quiesce when using writethrough mode (3.14+)"
* tag 'dm-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm cache: fix writethrough mode quiescing in cache_map
dm thin: use INIT_WORK_ONSTACK in noflush_work to avoid ODEBUG warning
dm verity: fix biovecs hash calculation regression
dm thin: fix rcu_read_lock being held in code that can sleep
dm thin: irqsave must always be used with the pool->lock spinlock
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Peter Anvin:
"Two very small changes: one fix for the vSMP Foundation platform, and
one to help LLVM not choke on options it doesn't understand (although
it probably should)"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/vsmp: Fix irq routing
x86: LLVMLinux: Wrap -mno-80387 with cc-option
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Pull KVM fixes from Paolo Bonzini:
- Fix for a Haswell regression in nested virtualization, introduced
during the merge window.
- A fix from Oleg to async page faults.
- A bunch of small ARM changes.
- A trivial patch to use the new MSI-X API introduced during the merge
window.
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: ARM: vgic: Fix the overlap check action about setting the GICD & GICC base address.
KVM: arm/arm64: vgic: fix GICD_ICFGR register accesses
KVM: async_pf: mm->mm_users can not pin apf->mm
KVM: ARM: vgic: Fix sgi dispatch problem
MAINTAINERS: co-maintainance of KVM/{arm,arm64}
arm: KVM: fix possible misalignment of PGDs and bounce page
KVM: x86: Check for host supported fields in shadow vmcs
kvm: Use pci_enable_msix_exact() instead of pci_enable_msix()
ARM: KVM: disable KVM in Kconfig on big-endian systems
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Martin Schwidefsky:
"Two bug fixes, one to fix a potential information leak in the BPF jit
and common-io-layer fix for old firmware levels"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH
s390/chsc: fix SEI usage on old FW levels
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git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband
Pull infiniband/rdma fixes from Roland Dreier:
"cxgb4 hardware driver fixes"
* tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
RDMA/cxgb4: Update Kconfig to include Chelsio T5 adapter
RDMA/cxgb4: Only allow kernel db ringing for T4 devs
RDMA/cxgb4: Force T5 connections to use TAHOE congestion control
RDMA/cxgb4: Fix endpoint mutex deadlocks
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
Pull parisc fixes from Helge Deller:
"Drop the architecture-specifc value for_STK_LIM_MAX to fix stack
related problems with GNU make"
* 'parisc-3.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Use generic uapi/asm/resource.h file
parisc: remove _STK_LIM_MAX override
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Commit 2ee57d58735 ("dm cache: add passthrough mode") inadvertently
removed the deferred set reference that was taken in cache_map()'s
writethrough mode support. Restore taking this reference.
This issue was found with code inspection.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org # 3.13+
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git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
"Here is a small set of pin control fixes for the v3.15 series. All
are individual driver fixes and quite self-contained. One of them
tagged for stable.
- Signedness bug in the TB10x
- GPIO inversion fix for the AS3722
- Clear pending pin interrups enabled in the bootloader in the
pinctrl-single driver
- Minor pin definition fixes for the PFC/Renesas driver"
* tag 'pinctrl-v3.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
sh-pfc: r8a7791: Fix definition of MOD_SEL3
sh-pfc: r8a7790: Fix definition of IPSR5
pinctrl: single: Clear pin interrupts enabled by bootloader
pinctrl: as3722: fix handling of GPIO invert bit
pinctrl/TB10x: Fix signedness bug
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git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
Pull module fixes from Rusty Russell:
"Fixed one missing place for the new taint flag, and remove a warning
giving only false positives (now we finally figured out why)"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
module: remove warning about waiting module removal.
Fix: tracing: use 'E' instead of 'X' for unsigned module taint flag
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Signed-off-by: Helge Deller <deller@gmx.de>
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There are only a couple of architectures that override _STK_LIM_MAX to
a non-infinity value. This changes the stack allocation semantics in
subtle ways. For example, GNU make changes its stack allocation to the
hard maximum defined by _STK_LIM_MAX. As a results, threads executed
by processes running under make are allocated a stack size of
_STK_LIM_MAX rather than a sensible default value. This causes various
thread stress tests to fail when they can't muster more than about 50
threads.
The attached change implements the default behavior used by the
majority of architectures.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Reviewed-by: Carlos O'Donell <carlos@systemhalted.org>
Cc: stable@vger.kernel.org # 3.14
Signed-off-by: Helge Deller <deller@gmx.de>
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Commit 93ea02bb8435 ("arch: Clean up asm/barrier.h implementations")
wired generic barrier.h for hexagon, but failed to delete the existing
file.
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Compile-tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
"Mostly tooling fixes, plus an Intel RAPL PMU driver fix"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf tests x86: Fix stack map lookup in dwarf unwind test
perf x86: Fix perf to use non-executable stack, again
perf tools: Remove extra '/' character in events file path
perf machine: Search for modules in %s/lib/modules/%s
perf tests: Add static build make test
perf tools: Fix bfd dependency libraries detection
perf tools: Use LDFLAGS instead of ALL_LDFLAGS
perf/x86: Fix RAPL rdmsrl_safe() usage
tools lib traceevent: Fix memory leak in pretty_print()
tools lib traceevent: Fix backward compatibility macros for pevent filter enums
perf tools: Disable libdw unwind for all but x86 arch
perf tests x86: Fix memory leak in sample_ustack()
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