linux-toradex.git/arch/arm/kernel, branch v3.0.2

ARM: 6994/1: smp_twd: Fix typo in 'twd_timer_rate' printing

2011-07-07T14:00:12+00:00

To get hundredths of MHz the rate needs to be divided by 10'000.
Here is an example:
 twd_timer_rate = 123456789
 Before the patch:
    twd_timer_rate / 1000000 = 123
    (twd_timer_rate / 1000000) % 100 = 23
    Result: 123.23MHz.
 After being fixed:
    twd_timer_rate / 1000000 = 123
    (twd_timer_rate / 10000) % 100 = 45
    Result: 123.45MHz.

Signed-off-by: Vitaly Kuzmichev 
Signed-off-by: Russell King

ARM: move memory layout sanity checking before meminfo initialization

2011-07-05T19:27:16+00:00

Ensure that the meminfo array is sanity checked before we pass the
memory to memblock.  This helps to ensure that memblock and meminfo
agree on the dimensions of memory, especially when more memory is
passed than the kernel can deal with.

Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: 6989/1: perf: do not start the PMU when no events are present

2011-07-05T11:37:23+00:00

armpmu_enable can be called in situations where no events are present
(for example, from the event rotation tick after a profiled task has
exited). In this case, we currently start the PMU anyway which may
leave it active inevitably without any events being monitored.

This patch adds a simple check to the enabling code so that we avoid
starting the PMU when no events are present.

Cc: 
Reported-by: Ashwin Chaugle 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: SMP: wait for CPU to be marked active

2011-06-21T10:09:05+00:00

When we bring a CPU online, we should wait for it to become active
before entering the idle thread, so we know that the scheduler and
thread migration is going to work.

Signed-off-by: Russell King

ARM: 6963/1: Thumb-2: Relax relocation requirements for non-function symbols

2011-06-17T10:25:04+00:00

The "Thumb bit" of a symbol is only really meaningful for function
symbols (STT_FUNC).

However, sometimes a branch is relocated against a non-function
symbol; for example, PC-relative branches to anonymous assembler
local symbols are typically fixed up against the start-of-section
symbol, which is not a function symbol.  Some inline assembler
generates references of this type, such as fixup code generated by
macros in .

The existing relocation code for R_ARM_THM_CALL/R_ARM_THM_JUMP24
interprets this case as an error, because the target symbol appears
to be an ARM symbol; but this is really not the case, since the
target symbol is just a base in these cases.  The addend defines
the precise offset to the target location, but since the addend is
encoded in a non-interworking Thumb branch instruction, there is no
explicit Thumb bit in the addend.  Because these instructions never
interwork, the implied Thumb bit in the addend is 1, and the
destination is Thumb by definition.

This patch removes the extraneous Thumb bit check for non-function
symbols, enabling modules containing the affected relocation types
to be loaded.  No modification to the actual relocation code is
required, since this code does not take bit[0] of the
location->destination offset into account in any case.

Function symbols are always checked for interworking conflicts, as
before.

Signed-off-by: Dave Martin 
Acked-by: Catalin Marinas 
Signed-off-by: Russell King

ARM: extend Code: line by one 16-bit quantity for Thumb instructions

2011-06-09T22:55:45+00:00

Dump out the following 16-bit instruction to the faulting instruction
in the Code: line.  This allows Thumb-2 instructions to be properly
encoded.

Tested-by: Kevin Hilman 
Signed-off-by: Russell King

ARM: 6955/1: cmpxchg syscall should data abort if page not write

2011-06-09T09:15:07+00:00

If the page to cmpxchg is user mode read only (not write),
we should simulate a data abort first.

Signed-off-by: Po-Yu Chuang 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: 6953/1: DT: don't try to access physical address zero

2011-06-09T09:15:06+00:00

If the DT physical address is zero, this is equivalent to no DT.
Especially when the actual RAM physical address is not located at zero,
the result of phys_to_virt() would point to la-la-land and crash the
kernel, which crash is completely silent this early during boot.

Signed-off-by: Nicolas Pitre 
Acked-by: Grant Likely 
Signed-off-by: Russell King

ARM: 6952/1: fix lockdep warning of "unannotated irqs-off"

2011-06-06T09:56:22+00:00

This patch fixes the lockdep warning of "unannotated irqs-off"[1].

After entering __irq_usr, arm core will disable interrupt automatically,
but __irq_usr does not annotate the irq disable, so lockdep may complain
the warning if it has chance to check this in irq handler.

This patch adds trace_hardirqs_off in __irq_usr before entering irq_handler
to handle the irq, also calls ret_to_user_from_irq to avoid calling
disable_irq again.

This is also a fix for irq off tracer.

[1], lockdep warning log of "unannotated irqs-off"

[   13.804687] ------------[ cut here ]------------
[   13.809570] WARNING: at kernel/lockdep.c:3335 check_flags+0x78/0x1d0()
[   13.816467] Modules linked in:
[   13.819732] Backtrace:
[   13.822357] [] (dump_backtrace+0x0/0x100) from [] (dump_stack+0x20/0x24)
[   13.831268]  r6:c07d8c2c r5:00000d07 r4:00000000 r3:00000000
[   13.837280] [] (dump_stack+0x0/0x24) from [] (warn_slowpath_common+0x5c/0x74)
[   13.846649] [] (warn_slowpath_common+0x0/0x74) from [] (warn_slowpath_null+0x2c/0x34)
[   13.856781]  r8:00000000 r7:00000000 r6:c18b8194 r5:60000093 r4:ef182000
[   13.863708] r3:00000009
[   13.866485] [] (warn_slowpath_null+0x0/0x34) from [] (check_flags+0x78/0x1d0)
[   13.875823] [] (check_flags+0x0/0x1d0) from [] (lock_acquire+0x4c/0x150)
[   13.884704] [] (lock_acquire+0x0/0x150) from [] (_raw_spin_lock+0x4c/0x84)
[   13.893798] [] (_raw_spin_lock+0x0/0x84) from [] (sched_ttwu_pending+0x58/0x8c)
[   13.903320]  r6:ef92d040 r5:00000003 r4:c18b8180
[   13.908233] [] (sched_ttwu_pending+0x0/0x8c) from [] (scheduler_ipi+0x18/0x1c)
[   13.917663]  r6:ef183fb0 r5:00000003 r4:00000000 r3:00000001
[   13.923645] [] (scheduler_ipi+0x0/0x1c) from [] (do_IPI+0x9c/0xfc)
[   13.932006] [] (do_IPI+0x0/0xfc) from [] (__irq_usr+0x48/0xe0)
[   13.939971] Exception stack(0xef183fb0 to 0xef183ff8)
[   13.945281] 3fa0:                                     ffffffc3 0001500c 00000001 0001500c
[   13.953948] 3fc0: 00000050 400b45f0 400d9000 00000000 00000001 400d9600 6474e552 bea05b3c
[   13.962585] 3fe0: 400d96c0 bea059c0 400b6574 400b65d8 20000010 ffffffff
[   13.969573]  r6:00000403 r5:fa240100 r4:ffffffff r3:20000010
[   13.975585] ---[ end trace efc4896ab0fb62cb ]---
[   13.980468] possible reason: unannotated irqs-off.
[   13.985534] irq event stamp: 1610
[   13.989044] hardirqs last  enabled at (1610): [] no_work_pending+0x8/0x2c
[   13.997131] hardirqs last disabled at (1609): [] ret_slow_syscall+0xc/0x1c
[   14.005371] softirqs last  enabled at (0): [] copy_process+0x2cc/0xa24
[   14.013183] softirqs last disabled at (0): [<  (null)>]   (null)

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

Merge branch 'setns'

2011-05-28T17:51:01+00:00

* setns:
  ns: Wire up the setns system call

Done as a merge to make it easier to fix up conflicts in arm due to
addition of sendmmsg system call