In order to stop branch tracing for a running task, we need to first
clear the branch tracing control bits before we may free the tracing
buffer.

If the traced task is running, the cpu might still trace that task
after the branch trace control bits have cleared.

Wait until the traced task has been scheduled out before proceeding.

A similar problem affects the task debug store context. We first remove
the context, then we need to wait until the task has been scheduled
out before we can free the context memory.
Reviewed-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NMarkus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144551.919636000@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

When a ptraced task is unlinked, we need to stop branch tracing for
that task.

Since the unlink is called with interrupts disabled, and we need
interrupts enabled to stop branch tracing, we defer the work.

Collect all branch tracing related stuff in a branch tracing context.
Reviewed-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NMarkus Metzger <markus.t.metzger@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144550.712401000@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Add a function to wait until some other task has been
switched out at least once.

This differs from wait_task_inactive() subtly, in that the
latter will wait until the task has left the CPU.
Signed-off-by: NMarkus Metzger <markus.t.metzger@intel.com>
Cc: markus.t.metzger@gmail.com
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144549.794157000@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

When the bts tracer is removed while the traced task is running,
the write to clear the bts tracer pointer races with context switch code.

Read the tracer once during a context switch.

When a new tracer is installed, the bts tracer is set in the ds context
before the tracer is initialized in order to claim the context for that
tracer.

This may result in write accesses using an uninitialized trace configuration
when scheduling timestamps have been requested.

Store active tracing flags separately and only set active flags after
the tracing configuration has been initialized.
Reviewed-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NMarkus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144548.881338000@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Merge reason: update to latest tracing and ptrace APIs
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Due to an apparent typo, commit a67d18f8
(NFS: load the rpc/rdma transport module automatically) lead to the
'proto=' mount option doing a double free, while Opt_mountproto leaks a
string.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This makes the defautl ext3 data ordering mode (when no explicit
ordering is set) configurable, so as to allow people to default to
'data=writeback' and get the resulting latency improvements.

This is a non-issue if a filesystem has been explicitly set to some
ordering (with 'tune2fs').
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'linux-next' of git://git.infradead.org/ubifs-2.6:
  UBIFS: fix recovery bug
  UBIFS: add R/O compatibility
  UBIFS: fix compiler warnings
  UBIFS: fully sort GCed nodes
  UBIFS: fix commentaries
  UBIFS: introduce a helpful variable
  UBIFS: use KERN_CONT
  UBIFS: fix lprops committing bug
  UBIFS: fix bogus assertion
  UBIFS: fix bug where page is marked uptodate when out of space
  UBIFS: amend key_hash return value
  UBIFS: improve find function interface
  UBIFS: list usage cleanup
  UBIFS: fix dbg_chk_lpt_sz()

* 'linux-next' of git://git.infradead.org/ubi-2.6:
  UBI: add fsync capability

The CAP_KILL check in exit_notify() looks just wrong, kill it.

Whatever logic we have to reset ->exit_signal, the malicious user
can bypass it if it execs the setuid application before exiting.
Signed-off-by: NOleg Nesterov <oleg@redhat.com>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Acked-by: NRoland McGrath <roland@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* git://git.infradead.org/mtd-2.6: (53 commits)
  [MTD] struct device - replace bus_id with dev_name(), dev_set_name()
  [MTD] [NOR] Fixup for Numonyx M29W128 chips
  [MTD] mtdpart: Make ecc_stats more realistic.
  powerpc/85xx: TQM8548: Update DTS file for multi-chip support
  powerpc: NAND: FSL UPM: document new bindings
  [MTD] [NAND] FSL-UPM: Add wait flags to support board/chip specific delays
  [MTD] [NAND] FSL-UPM: add multi chip support
  [MTD] [NOR] Add device parent info to physmap_of
  [MTD] [NAND] Add support for NAND on the Socrates board
  [MTD] [NAND] Add support for 4KiB pages.
  [MTD] sysfs support should not depend on CONFIG_PROC_FS
  [MTD] [NAND] Add parent info for CAFÉ controller
  [MTD] support driver model updates
  [MTD] driver model updates (part 2)
  [MTD] driver model updates
  [MTD] [NAND] move gen_nand's probe function to .devinit.text
  [MTD] [MAPS] move sa1100 flash's probe function to .devinit.text
  [MTD] fix use after free in register_mtd_blktrans
  [MTD] [MAPS] Drop now unused sharpsl-flash map
  [MTD] ofpart: Check name property to determine partition nodes.
  ...

Manually fix trivial conflict in drivers/mtd/maps/Makefile

As noted by Janne Grunau it would be good if the date was also right.

(Web site also resynched)
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix this build error:

  drivers/md/raid1.c: In function 'raid1_congested':
  drivers/md/raid1.c:589: error: 'BDI_write_congested' undeclared

BDI_write_congested was changed in commit 1faa16d2 ("block: change the
request allocation/congestion logic to be sync/async based")
Signed-off-by: NAlexander Beregalov <a.beregalov@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The 8430 patch was short a const so caused a warning.
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

There are various bits of code here that are unfinished and instead of
being harmless either confuse or spew stuff into the logs at higher than
debug level. They can and should go away.

Also remove the bogus use of tty->lowlatency. We fixed the need for this hack
long ago (with the flip buffer rewrite) but people keep copying it into drivers.
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Closes bug 9065
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Bugzilla #9095 and a couple of other confirmations
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NBreno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fixes:

  In file included from drivers/serial/mux.c:37:
  include/linux/serial_core.h: In function 'uart_handle_sysrq_char':
  include/linux/serial_core.h:467: error: 'struct uart_port' has no member named 'sysrq'
  include/linux/serial_core.h:468: error: 'struct uart_port' has no member named 'sysrq'
Signed-off-by: NAlexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

As it was, the retval was never returned, so its assignments were silly.
Just consolidate everything to rc, and remove the unused retval variable.
Signed-off-by: NBreno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlan Cox <alan@etchedpixels.co.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NBreno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mxser_check_modem_status is called with tty parameter, so the
reference should be increased by callers already -- for ioctl
syscall it is held whole time gap since open to close, for
interrupt, the reference count is increased in the irq handler.

There is no tty_kref_put in that function, so this also fixes
a refcounting bug.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

There is missing tty_kref_put on some paths in moxa_poll_port,
although the reference is always taken. Fix it.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Reported-by: NJan 'Yenya' Kasprzak <kas@fi.muni.cz>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The isicom driver leaks a kref on the shutdown path. Drop the additional
kref we took
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Found by Daniel Marjamäki using cppcheck
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The riscom8 module is missing the char-major-48-* alias that would cause
it to be auto-loaded when a device of that type is opened.  This patch
adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The cdc_acm module is missing the char-major-166-* alias that would
cause it to be auto-loaded when a device of that type is opened.  This
patch adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The specialix module is missing the char-major-75-* alias that would
cause it to be auto-loaded when a device of that type is opened.  This
patch adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The cyclades module is missing the char-major-19-* alias that would
cause it to be auto-loaded when a device of that type is opened.  This
patch adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The applicom module is missing the char-major-10-157 alias that would
cause it to be auto-loaded when a device of that type is opened.  This
patch adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix bug - up arrow key works abnormal for bf561 ezkit board
Signed-off-by: NGraf Yang <graf.yang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Reported-by: NQian Zhang <zhangq@sansitech.com>
Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fixes this compile issue:

  drivers/serial/bfin_5xx.c: In function bfin_serial_rx_chars:
  drivers/serial/bfin_5xx.c:178: error: struct uart_info has no member named tty
Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Enable third UART on BF538/9
Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NWill Page <will.page@ni.com>
Signed-off-by: NShawn Bohrer <shawn.bohrer@ni.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This implements basic support for all 843x RS232 devices, but does not
add DMA support.  This means that sustained data transfers at high baud
rates may not be possible on multiple ports simultaneously.
Signed-off-by: NShawn Bohrer <shawn.bohrer@ni.com>
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add new Wacom device IDs to the 8250_pnp serial driver, to support
autoconfig on some newer tablet PCs.  Also add a comment to clarify that
the FUJ02E6 device is a custom protocol, not a Wacom tablet.
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlan Cox <alan@etchedpixels.co.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add another serial Wacom tablet with pnp_id: WACF009.
Signed-off-by: NDanny Kukawka <dkukawka@suse.de>
Signed-off-by: NAlan Cox <alan@etchedpixels.co.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>