linux.git/arch/arm/kernel, branch v2.6.35

ARM: 6226/1: fix kprobe bug in ldr instruction emulation

2010-07-14T22:28:06+00:00

From: Bin Yang 

Cc: stable@kernel.org
Signed-off-by: Bin Yang 
Signed-off-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: lockdep: fix unannotated irqs-on

2010-07-10T09:53:13+00:00

CPU: Testing write buffer coherency: ok
------------[ cut here ]------------
WARNING: at kernel/lockdep.c:3145 check_flags+0xcc/0x1dc()
Modules linked in:
[] (unwind_backtrace+0x0/0xf8) from [] (dump_stack+0x20/0x24)
[] (dump_stack+0x20/0x24) from [] (warn_slowpath_common+0x58/0x70)
[] (warn_slowpath_common+0x58/0x70) from [] (warn_slowpath_null+0x20/0x24)
[] (warn_slowpath_null+0x20/0x24) from [] (check_flags+0xcc/0x1dc)
[] (check_flags+0xcc/0x1dc) from [] (lock_acquire+0x50/0x140)
[] (lock_acquire+0x50/0x140) from [] (_raw_spin_lock+0x50/0x88)
[] (_raw_spin_lock+0x50/0x88) from [] (set_task_comm+0x2c/0x60)
[] (set_task_comm+0x2c/0x60) from [] (kthreadd+0x30/0x108)
[] (kthreadd+0x30/0x108) from [] (kernel_thread_exit+0x0/0x8)
---[ end trace 1b75b31a2719ed1c ]---
possible reason: unannotated irqs-on.
irq event stamp: 3
hardirqs last  enabled at (2): [] finish_task_switch+0x48/0xb0
hardirqs last disabled at (3): [] ret_slow_syscall+0xc/0x1c
softirqs last  enabled at (0): [] copy_process+0x394/0xe5c
softirqs last disabled at (0): [<(null)>] (null)

Fix this by ensuring that the lockdep interrupt state is manipulated in
the appropriate places.  We essentially treat userspace as an entirely
separate environment which isn't relevant to lockdep (lockdep doesn't
monitor userspace.)  We don't tell lockdep that IRQs will be enabled
in that environment.

Instead, when creating kernel threads (which is a rare event compared
to entering/leaving userspace) we have to update the lockdep state.  Do
this by starting threads with IRQs disabled, and in the kthread helper,
tell lockdep that IRQs are enabled, and enable them.

This provides lockdep with a consistent view of the current IRQ state
in kernel space.

This also revert portions of 0d928b0b616d1c5c5fe76019a87cba171ca91633
which didn't fix the problem.

Tested-by: Ming Lei 
Signed-off-by: Russell King

ARM: 6205/1: perf: ensure counter delta is treated as unsigned

2010-07-04T22:11:37+00:00

Hardware performance counters on ARM are 32-bits wide but atomic64_t
variables are used to represent counter data in the hw_perf_event structure.

The armpmu_event_update function right-shifts a signed 64-bit delta variable
and adds the result to the event count. This can lead to shifting in sign-bits
if the MSB of the 32-bit counter value is set. This results in perf output
such as:

 Performance counter stats for 'sleep 20':

 18446744073460670464  cycles             <-- 0xFFFFFFFFF12A6000
        7783773  instructions             #      0.000 IPC
            465  context-switches
            161  page-faults
        1172393  branches

   20.154242147  seconds time elapsed

This patch ensures that the delta value is treated as unsigned so that the
right shift sets the upper bits to zero.

Cc: 
Acked-by: Jamie Iles 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

2010-05-25T19:06:33+00:00

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (103 commits)
  ARM: 6141/1: Add audio support part in arch/arm/mach-w90x900
  ARM: 5939/1: ARM: Add option CMDLINE_FORCE to force usage of the in-kernel cmdline
  ARM: 6140/1: silence a bogus sparse warning in unwind.c
  ARM: mach-at91: duplicated include
  ARM: arch/arm/nwfpe/fpsr.h: Checkpatch cleanup
  ARM: arch/arm/mach-shark/pci.c: Checkpatch cleanup
  ARM: arch/arm/nwfpe/ChangeLog: Checkpatch cleanup
  ARM: arch/arm/mach-sa1100/leds.c: Checkpatch cleanup
  ARM: arch/arm/mach-h720x/common.h: Checkpatch cleanup
  ARM: arch/arm/mach-footbridge/ebsa285-pci.c: Checkpatch cleanup
  ARM: arch/arm/mach-clps711x/Makefile.boot: Checkpatch cleanup
  ARM: arch/arm/boot/bootp/bootp.lds: Checkpatch cleanup
  ARM: SPEAR6xx: remove duplicated #include
  ARM: s3c6400_defconfig: Add NAND driver
  ARM: s3c6400_defconfig: enable sound as modules
  ARM: s3c6400_defconfig: enable power management
  ARM: s5pv210_defconfig: Update s5pv210_defconfig to v2.6.34
  ARM: s5pc110_defconfig: Update s5pc110_defconfig to v2.6.34
  ARM: s5p6442_defconfig: Update s5p6442_defconfig to v2.6.34
  ARM: s5p6440_defconfig: Update s5p6440_defconfig to v2.6.34
  ...

ARM: 5939/1: ARM: Add option CMDLINE_FORCE to force usage of the in-kernel cmdline

2010-05-24T19:45:00+00:00

Add an option to force usage of the in-kernel cmdline even if the boot
loader passes another command string to the kernel.

Useful if someone cannot or don't want to change the
command-line options of the boot loader but is able to change
the kernel.

Signed-off-by: Alexander Holler 
Signed-off-by: Russell King

ARM: 6140/1: silence a bogus sparse warning in unwind.c

2010-05-24T19:42:03+00:00

The check for compiler which is supposed to miscompile unwind tables
clearly has nothing to do with sparse (which does not define necessary
macros anyway), so simply silence it.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Russell King

kgdb: core changes to support kdb

2010-05-21T02:04:21+00:00

These are the minimum changes to the kgdb core in order to enable an
API to connect a new front end (kdb) to the debug core.

This patch introduces the dbg_kdb_mode variable controls where the
user level I/O is routed.  It will be routed to the gdbstub (kgdb) or
to the kdb front end which is a simple shell available over the kgdboc
connection.

You can switch back and forth between kdb or the gdb stub mode of
operation dynamically.  From gdb stub mode you can blindly type
"$3#33", or from the kdb mode you can enter "kgdb" to switch to the
gdb stub.

The logic in the debug core depends on kdb to look for the typical gdb
connection sequences and return immediately with KGDB_PASS_EVENT if a
gdb serial command sequence is detected.  That should allow a
reasonably seamless transition between kdb -> gdb without leaving the
kernel exception state.  The two gdb serial queries that kdb is
responsible for detecting are the "?" and "qSupported" packets.

CC: Ingo Molnar 
Signed-off-by: Jason Wessel 
Acked-by: Martin Hicks

Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

2010-05-19T18:37:22+00:00

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (224 commits)
  ARM: remove 'select GENERIC_TIME'
  ARM: 6136/1: ARCH_REQUIRE_GPIOLIB selects GENERIC_GPIO
  ARM: 6074/1: oprofile: convert from sysdev to platform device
  ARM: 6073/1: oprofile: remove old files and update KConfig
  ARM: 6072/1: oprofile: use perf-events framework as backend
  ARM: 6071/1: perf-events: allow modules to query the number of hardware counters
  ARM: 6070/1: perf-events: add support for xscale PMUs
  ARM: 6069/1: perf-events: use numeric ID to identify PMU
  ARM: 6064/1: pmu: register IRQs at runtime
  ARM: Optionally allow ARMv6 to use 'normal, bufferable' memory for DMA
  ARM: 6134/1: Handle instruction cache maintenance fault properly
  ARM: nwfpe: allow debugging output to be configured at runtime
  ARM: rename mach_cpu_disable() to platform_cpu_disable()
  ARM: 6132/1: PL330: Add common core driver
  ARM: 6094/1: Extend cache-l2x0 to support the 16-way PL310
  ARM: Move memory mapping into mmu.c
  ARM: Ensure meminfo is sorted prior to sanity_check_meminfo
  ARM: Remove useless linux/bootmem.h includes
  ARM: convert /proc/cpu/aligment to seq_file
  arm: use asm-generic/scatterlist.h
  ...

Merge branch 'devel-stable' into devel

2010-05-17T16:24:04+00:00

Conflicts:
	arch/arm/Kconfig
	arch/arm/include/asm/system.h
	arch/arm/mm/Kconfig

ARM: 6071/1: perf-events: allow modules to query the number of hardware counters

2010-05-17T10:53:58+00:00

For OProfile to initialise oprofilefs correctly, it needs to know
the number of counters it can represent.

This patch adds a function to the ARM perf-events backend to return
the number of hardware counters available for the current PMU.

Cc: Jamie Iles 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King