linux-stable.git/arch/powerpc/kernel/entry_64.S, branch v3.8

powerpc/book3e: Disable interrupt after preempt_schedule_irq

2013-01-28T23:18:15+00:00

In preempt case current arch_local_irq_restore() from
preempt_schedule_irq() may enable hard interrupt but we really
should disable interrupts when we return from the interrupt,
and so that we don't get interrupted after loading SRR0/1.

Signed-off-by: Tiejun Chen 
CC: 
Signed-off-by: Benjamin Herrenschmidt

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2012-12-18T17:58:09+00:00

Pull powerpc update from Benjamin Herrenschmidt:
 "The main highlight is probably some base POWER8 support.  There's more
  to come such as transactional memory support but that will wait for
  the next one.

  Overall it's pretty quiet, or rather I've been pretty poor at picking
  things up from patchwork and reviewing them this time around and Kumar
  no better on the FSL side it seems..."

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (73 commits)
  powerpc+of: Rename and fix OF reconfig notifier error inject module
  powerpc: mpc5200: Add a3m071 board support
  powerpc/512x: don't compile any platform DIU code if the DIU is not enabled
  powerpc/mpc52xx: use module_platform_driver macro
  powerpc+of: Export of_reconfig_notifier_[register,unregister]
  powerpc/dma/raidengine: add raidengine device
  powerpc/iommu/fsl: Add PAMU bypass enable register to ccsr_guts struct
  powerpc/mpc85xx: Change spin table to cached memory
  powerpc/fsl-pci: Add PCI controller ATMU PM support
  powerpc/86xx: fsl_pcibios_fixup_bus requires CONFIG_PCI
  drivers/virt: the Freescale hypervisor driver doesn't need to check MSR[GS]
  powerpc/85xx: p1022ds: Use NULL instead of 0 for pointers
  powerpc: Disable relocation on exceptions when kexecing
  powerpc: Enable relocation on during exceptions at boot
  powerpc: Move get_longbusy_msecs into hvcall.h and remove duplicate function
  powerpc: Add wrappers to enable/disable relocation on exceptions
  powerpc: Add set_mode hcall
  powerpc: Setup relocation on exceptions for bare metal systems
  powerpc: Move initial mfspr LPCR out of __init_LPCR
  powerpc: Add relocation on exception vector handlers
  ...

powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning !

2012-11-15T02:00:17+00:00

This patch tries to fix the following BUG report:

[    0.012313] BUG: MAX_STACK_TRACE_ENTRIES too low!
[    0.012318] turning off the locking correctness validator.
[    0.012321] Call Trace:
[    0.012330] [c00000017666f6d0] [c000000000012128] .show_stack+0x78/0x184 (unreliable)
[    0.012339] [c00000017666f780] [c0000000000b6348] .save_trace+0x12c/0x14c
[    0.012345] [c00000017666f800] [c0000000000b7448] .mark_lock+0x2bc/0x710
[    0.012351] [c00000017666f8b0] [c0000000000bb198] .__lock_acquire+0x748/0xaec
[    0.012357] [c00000017666f9b0] [c0000000000bb684] .lock_acquire+0x148/0x194
[    0.012365] [c00000017666fa80] [c00000000069371c] .mutex_lock_nested+0x84/0x4ec
[    0.012372] [c00000017666fb90] [c000000000096998] .smpboot_register_percpu_thread+0x3c/0x10c
[    0.012380] [c00000017666fc30] [c0000000009ba910] .spawn_ksoftirqd+0x28/0x48
[    0.012386] [c00000017666fcb0] [c00000000000a98c] .do_one_initcall+0xd8/0x1d0
[    0.012392] [c00000017666fd60] [c00000000000b1f8] .kernel_init+0x120/0x398

[    0.012398] [c00000017666fe30] [c000000000009ad4] .ret_from_kernel_thread+0x5c/0x64
[    0.012404] [c00000017666fa00] [c00000017666fb20] 0xc00000017666fb20
[    0.012410] [c00000017666fa80] [c00000000069371c] .mutex_lock_nested+0x84/0x4ec
[    0.012416] [c00000017666fb90] [c000000000096998] .smpboot_register_percpu_thread+0x3c/0x10c
[    0.012422] [c00000017666fc30] [c0000000009ba910] .spawn_ksoftirqd+0x28/0x48
[    0.012427] [c00000017666fcb0] [c00000000000a98c] .do_one_initcall+0xd8/0x1d0
[    0.012433] [c00000017666fd60] [c00000000000b1f8] .kernel_init+0x120/0x398

[    0.012439] [c00000017666fe30] [c000000000009ad4] .ret_from_kernel_thread+0x5c/0x64
.......

The reason is that the back chain of c00000017666fe30
(ret_from_kernel_thread) contains some invalid value, which might form a
loop.

Signed-off-by: Li Zhong 
Signed-off-by: Benjamin Herrenschmidt

powerpc: take dereferencing to ret_from_kernel_thread()

2012-10-22T02:25:11+00:00

Signed-off-by: Al Viro

powerpc: don't mess with r2 in copy_thread() and friends

2012-10-14T23:35:52+00:00

kernel_thread() callbacks are *not* in modules and are not going to
be there.  And it's not even read in ppc32 ret_from_kernel_thread(),
so no need to bother with it there either.

Signed-off-by: Al Viro

powerpc: switch to saner kernel_execve() semantics

2012-10-14T23:35:44+00:00

Signed-off-by: Al Viro

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2012-10-12T01:49:08+00:00

Pull pile 2 of execve and kernel_thread unification work from Al Viro:
 "Stuff in there: kernel_thread/kernel_execve/sys_execve conversions for
  several more architectures plus assorted signal fixes and cleanups.

  There'll be more (in particular, real fixes for the alpha
  do_notify_resume() irq mess)..."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (43 commits)
  alpha: don't open-code trace_report_syscall_{enter,exit}
  Uninclude linux/freezer.h
  m32r: trim masks
  avr32: trim masks
  tile: don't bother with SIGTRAP in setup_frame
  microblaze: don't bother with SIGTRAP in setup_rt_frame()
  mn10300: don't bother with SIGTRAP in setup_frame()
  frv: no need to raise SIGTRAP in setup_frame()
  x86: get rid of duplicate code in case of CONFIG_VM86
  unicore32: remove pointless test
  h8300: trim _TIF_WORK_MASK
  parisc: decide whether to go to slow path (tracesys) based on thread flags
  parisc: don't bother looping in do_signal()
  parisc: fix double restarts
  bury the rest of TIF_IRET
  sanitize tsk_is_polling()
  bury _TIF_RESTORE_SIGMASK
  unicore32: unobfuscate _TIF_WORK_MASK
  mips: NOTIFY_RESUME is not needed in TIF masks
  mips: merge the identical "return from syscall" per-ABI code
  ...

Conflicts:
	arch/arm/include/asm/thread_info.h

powerpc: switch to generic sys_execve()/kernel_execve()

2012-10-01T03:35:51+00:00

the only non-obvious part is that current_pt_regs() is really needed
here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace
uses (the thing task_pt_regs() is intended for), but not for us.

Signed-off-by: Al Viro

powerpc: split ret_from_fork

2012-10-01T03:31:19+00:00

... and get rid of in-kernel syscalls in kernel_thread()

Signed-off-by: Al Viro

powerpc/kprobe: Complete kprobe and migrate exception frame

2012-09-18T05:32:42+00:00

We can't emulate stwu since that may corrupt current exception stack.
So we will have to do real store operation in the exception return code.

Firstly we'll allocate a trampoline exception frame below the kprobed
function stack and copy the current exception frame to the trampoline.
Then we can do this real store operation to implement 'stwu', and reroute
the trampoline frame to r1 to complete this exception migration.

Signed-off-by: Tiejun Chen 
Signed-off-by: Benjamin Herrenschmidt