linux-toradex.git/arch/arm/kernel, branch v3.10.31

ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic

2014-01-25T16:27:11+00:00

commit 4f9b4fb7a2091eec339413a460b1665758401828 upstream.

In case of normal kexec kernel load, all cpu's are offlined
before calling machine_kexec().But in case crash panic cpus
are relaxed in machine_crash_nonpanic_core() SMP function
but not offlined.

When crash kernel is loaded with kexec and on panic trigger
machine_kexec() checks for number of cpus online.
If more than one cpu is online machine_kexec() fails to load
with below error

kexec: error: multiple CPUs still online

In machine_crash_nonpanic_core() SMP function, offline CPU
before cpu_relax

Signed-off-by: Vijaya Kumar K 
Acked-by: Stephen Warren 
Acked-by: Will Deacon 
Signed-off-by: Russell King 
Cc: l00221744 
Signed-off-by: Greg Kroah-Hartman

ARM: fix "bad mode in ... handler" message for undefined instructions

2014-01-15T23:28:51+00:00

commit 29c350bf28da333e41e30497b649fe335712a2ab upstream.

The array was missing the final entry for the undefined instruction
exception handler; this commit adds it.

Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: hyp: initialize CNTVOFF to zero

2014-01-09T20:24:26+00:00

commit 0af0b189abf73d232af782df2f999235cd2fed7f upstream.

In order to be able to use the virtual counter in a safe way,
make sure it is initialized to zero before dropping to SVC.

Signed-off-by: Marc Zyngier 
Signed-off-by: Mark Rutland 
Acked-by: Santosh Shilimkar 
Cc: Dave Martin 
Cc: Mark Brown 
Signed-off-by: Greg Kroah-Hartman

ARM: 7913/1: fix framepointer check in unwind_frame

2013-12-20T15:45:07+00:00

commit 3abb6671a9c04479c4bd026798a05f857393b7e2 upstream.

This patch fixes corner case when (fp + 4) overflows unsigned long,
for example: fp = 0xFFFFFFFF -> fp + 4 == 3.

Signed-off-by: Konstantin Khlebnikov 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: 7912/1: check stack pointer in get_wchan

2013-12-20T15:45:07+00:00

commit 1b15ec7a7427d4188ba91b9bbac696250a059d22 upstream.

get_wchan() is lockless. Task may wakeup at any time and change its own stack,
thus each next stack frame may be overwritten and filled with random stuff.

/proc/$pid/stack interface had been disabled for non-current tasks, see [1]
But 'wchan' still allows to trigger stack frame unwinding on volatile stack.

This patch fixes oops in unwind_frame() by adding stack pointer validation on
each step (as x86 code do), unwind_frame() already checks frame pointer.

Also I've found another report of this oops on stackoverflow (irony).

Link: http://www.spinics.net/lists/arm-kernel/msg110589.html [1]
Link: http://stackoverflow.com/questions/18479894/unwind-frame-cause-a-kernel-paging-error

Signed-off-by: Konstantin Khlebnikov 
Acked-by: Will Deacon 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: 7876/1: clear Thumb-2 IT state on exception handling

2013-12-04T18:55:46+00:00

commit e16b31bf47738f4498d7ce632e12d7d2a6a2492a upstream.

The exception handling code fails to clear the IT state, potentially
leading to incorrect execution of the fixup if the size of the IT
block is more than one.

Let fixup_exception do the IT sanitizing if a fixup has been found,
and restore CPSR from the stack when returning from a data abort.

Cc: Will Deacon 
Reviewed-by: Catalin Marinas 
Signed-off-by: Marc Zyngier 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: Fix the world famous typo with is_gate_vma()

2013-10-18T14:45:44+00:00

commit 1d0bbf428924f94867542d49d436cf254b9dbd06 upstream.

Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman 
Cc: Colin Cross 
Signed-off-by: Greg Kroah-Hartman

ARM: 7809/1: perf: fix event validation for software group leaders

2013-08-20T15:43:05+00:00

commit c95eb3184ea1a3a2551df57190c81da695e2144b upstream.

It is possible to construct an event group with a software event as a
group leader and then subsequently add a hardware event to the group.
This results in the event group being validated by adding all members
of the group to a fake PMU and attempting to allocate each event on
their respective PMU.

Unfortunately, for software events wthout a corresponding arm_pmu, this
results in a kernel crash attempting to dereference the ->get_event_idx
function pointer.

This patch fixes the problem by checking explicitly for software events
and ignoring those in event validation (since they can always be
scheduled). We will probably want to revisit this for 3.12, since the
validation checks don't appear to work correctly when dealing with
multiple hardware PMUs anyway.

Reported-by: Vince Weaver 
Tested-by: Vince Weaver 
Tested-by: Mark Rutland 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

perf/arm: Fix armpmu_map_hw_event()

2013-08-20T15:43:02+00:00

commit b88a2595b6d8aedbd275c07dfa784657b4f757eb upstream.

Fix constraint check in armpmu_map_hw_event().

Reported-and-tested-by: Vince Weaver 
Signed-off-by: Ingo Molnar 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

ARM: fix nommu builds with 48be69a02 (ARM: move signal handlers into a vdso-like page)

2013-08-12T01:35:20+00:00

commit 8c0cc8a5d90bc7373a7a9e7f7a40eb41f51e03fc upstream.

Olof reports that noMMU builds error out with:

arch/arm/kernel/signal.c: In function 'setup_return':
arch/arm/kernel/signal.c:413:25: error: 'mm_context_t' has no member named 'sigpage'

This shows one of the evilnesses of IS_ENABLED().  Get rid of it here
and replace it with #ifdef's - and as no noMMU platform can make use
of sigpage, depend on CONIFG_MMU not CONFIG_ARM_MPU.

Reported-by: Olof Johansson 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman