Fix: Add granularity to RHEL kernel version checks

Our RHEL kernel version macros were based on the major and minor version
of the distribution version like "7.2" instead of the full kernel version
like "327.4.4". This prevented us from adding compatibility changes with
sufficient granularity.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.7.2

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: filter interpreter with userspace strings

The filter interpreter is populating the "str" register field, but the
string comparison functions expect to use the "user_str" register field
whenever it deals with a userspace string ("user" flag set to 1).

Since we are using __copy_from_user_inatomic(), this is typically
bailing out on anything that requires to read the string (except the '*'
wildcard).

Fixes #943

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: rename kvm x86 TRACE_SYSTEM to avoid name clash

The lttng-probe-kvm and lttng-probe-kvm-x86 have the same TRACE_SYSTEM
string. Because of that, both modules can't be loaded at the same time.
The second module fails to load silently. Rename the TRACE_SYSTEM of
lttng-probe-kvm-x86 to avoid the clash.

We need to use the LTTNG_TRACEPOINT_EVENT_MAP to perform this
namespacing while still hooking onto the kernel tracepoints.

Fixes #895

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: format address fields as hexadecimal

Fixes #947

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

PowerPC-64 ABIv1: add build error if KALLSYMS_ALL is missing

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: system call instrumentation overrides

* All architectures

- For mmap, print the "ret" value as an hexadecimal integer (rather than
  base 10), which better suits a pointer.
- Add missing "clone" override define, which ensures the clone
  system call override is used rather than leaving it as an
  "unknown" system call.

* ARM32

- Add missing output return values to arm_fadvise64_64,
  sync_file_range2.
- Handle the 64-bit parameters of both arm_fadvise64_64 and
  sync_file_range2 correctly on arm32, on big and little endian builds.
- Move the mmap2 system call instrumentation from "pointers" to
  "integers" override header, and add the missing return value
  (sc_exit).

* PPC32

- Add sync_file_range2 system call instrumentation. Handle the
  64-bit parameters on big and little endian builds.
- Move the mmap2 system call instrumentation from "pointers" to
  "integers" override header, and add the missing return value
  (sc_exit).

* PPC64 compat

- Include compatibility (ppc32) header in ppc64 build to trace compat
  system calls on PPC64 big endian.

* x86-32

- Add mmap2 system call instrumentation override.
- Add sync_file_range instrumentation override, correctly combining
  the low/high parts of offset and nbytes into 64-bit fields.

Tested-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: page_alloc wrapper incorrect parenthesis

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add missing versions and init call for page_alloc wrapper

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Define lttng-tracer metadata only once

Fixes sysfs trying to create the lttng-tracer module version node
multiple times.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: handle negative clock offset

In the unlikely situation where a system sets its hardware clock
(CLOCK_REALTIME) to 0 (Epoch) after boot, the difference

  monotonic - realtime

becomes negative.

Fixup this situation by returning a 0 offset in this case.

This ensures that trace viewer implementations (e.g. babeltrace) which
currently cannot handle the negative offset (known bug) still work with
the generated traces.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: sched instrumentation for 4.1-rt11

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add RT patch version macros

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Ubuntu kernel range for block_rq_complete

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Ubuntu kernel range for mm_page_alloc_extfrag

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: update vmscan instrumentation for kernel 4.5

The following tracepoint changes made their way into Linux 4.5-rc1:

commit 3aa2385111168187f24a6db04697c6fab0fab9b4
Author: yalin wang <yalin.wang2010@gmail.com>
Date:   Thu Jan 14 15:18:30 2016 -0800

    mm/vmscan.c: change trace_mm_vmscan_writepage() proto type

and

commit ba5e9579433aefcdccdec207601e124d3bdf2a71
Author: yalin wang <yalin.wang2010@gmail.com>
Date:   Thu Jan 14 15:18:48 2016 -0800

    mm: change mm_vmscan_lru_shrink_inactive() proto types

Update the lttng-modules instrumentation to match those changes.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: check reference counts for overflow

Linux kernel CVE-2016-0728 is a use-after-free based on overflow of the
reference counting mechanism.

Implement a kref wrapper in lttng that validates overflows, and use it
instead of kref_get(). Also check explicitly for overflows on file
fcount counters.

This should not be an issue in practice in lttng-modules because the ABI
is only exposed to root, but let's err on the safe side.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: RHEL 7.2 scsi instrumentation

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: RHEL 7.2 kvm instrumentation

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.7.1

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Use MAX_RT_PRIO offset in sched_wakeup_template

All other sched_* events with prio fields offset the task_struct's
prio value by subtracting MAX_RT_PRIO. This way the value corresponds
to that given by the kernel's task_prio function, and thus with the
prio context field.

This adds the same offset to sched_wakeup, sched_wakeup_new, and
sched_waking, via the sched_wakeup_template event class. This way
their value is comparable to other sched_* events, and the prio
context.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: update sched instrumentation for kernel 4.4.0

Due to upstream Linux kernel commit:

commit c73464b1c8434ad4cbfd5369c3e724f3e8ffe5a4
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Mon Sep 28 18:06:56 2015 +0200

    sched/core: Fix trace_sched_switch()

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: instrumentation: v4lv2 missing include

Starting at least with 4.3 kernel, we need to specifically include
media/videobuf2-core.h.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: header size larger than 256 bytes

When adding large context (e.g. callstack), headers larger than 256
bytes cause discrepancy between calculated size and size written into
the trace buffers. This generates a corrupted trace and triggers a
warning in ring buffer backend, which triggers a safety net disabling
tracing for the current channel.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: tracepoint listing misses last loaded probe

The seqfile iteration listing tracepoints operates on the probe list
directly, without going through the lttng_get_probe_list_head()
accessor which ensures that the lazy list of probes is moved to the
actual list of probes.

This causes an issue when loading a probe and then listing the
tracepoints when no tracing sessions are active: the last probe loaded
is missing from the listing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: lttng trace-clock needs to disable preemption

We use a per-cpu data structure, and some contexts (e.g. buffer create)
call this function with preemption enabled. This is the case also for
buffer flush operation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.7.0

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: writeback instrumentation update for 4.3 Linux kernel

Linux upstream commit:

commit 5634cc2aa9aebc77bc862992e7805469dcf83dac
Author: Tejun Heo <tj@kernel.org>
Date:   Tue Aug 18 14:54:56 2015 -0700

    writeback: update writeback tracepoints to report cgroup

Updated the tracepoint signatures for writeback probes. Follow this
change. Don't add extra data (cgroup information) yet.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: update sched wakeup instrumentation for 4.3 kernel

Change introduced in upstream Linux:

commit fbd705a0c6184580d0e2fbcbd47a37b6e5822511
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Tue Jun 9 11:13:36 2015 +0200

    sched: Introduce the 'trace_sched_waking' tracepoint

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: lttng-test build failure for kernels < 3.0

Fixes an undefined reference to kstrtouint_from_user.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.7.0-rc2

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Use 3.18 syscall instrumentation for MIPS32

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update the MIPS32 syscall instrumentation to 3.18

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Move pipe override to the arch specific pointers_override.h

The MIPS architecture has a non-standard calling convention for pipe()
and cannot use the provided override for the pipe event.

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Implement lttng test module

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup: remove logically dead code

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: filter validator use after free

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: use after free in channel release

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: non-enabler events should be disabled by default

The session daemon expects that all events (enablers and events) are
disabled when created, so we can attach a filter before enabling them.

Also fix the kretprobe to ensure we can enable/disable both the entry
and return probe (--function instrumentation).

Fixes: #926
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: build failure on 2.6.36

Fixes build failure on the 2.6.36 kernel branch which misses the
vzalloc() function.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup: split bdi_dirty_ratelimit with ifdef into separate macros

Makes the code easier to maintain in the long run.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: writeback instrumentation for 4.2 kernels

Bandwidth related fields were moved by this commit:

commit a88a341a73be4ef035ca26170c849f002797da27
Author: Tejun Heo <tj@kernel.org>
Date:   Fri, 22 May 2015 17:13:28 -0400

    writeback: move bandwidth related fields from backing_dev_info into
    bdi_writeback

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: kmem probe with Ubuntu 3.13 kernels

Fixes an undefined reference to get_pageblock_flags_mask.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: disable kvm probe if lapic.h isn't found

In a typical distribution if just linux-headers is installed, lapic.h
will not be installed. We should check if that file exists and not build
the module.

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: timer instrumentation for 4.2 kernels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: ext4 instrumentation for 4.2 kernels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: kvm instrumentation for 4.2 kernels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: mm_page_alloc_extfrag instrumentation for kernel 3.18.10

The following commit has been backported from kernel 3.19.2 into
3.18.10, introducing a change to mm_page_alloc_extfrag and therefore
provoking a build failure on a 3.18.10 kernel:

commit a4f3f96f850db69890f47984c60606a2362bee89
Author: Vlastimil Babka <vbabka@suse.cz>
Date:   Wed Feb 11 15:28:15 2015 -0800

    mm: when stealing freepages, also take pages created by splitting buddy page

    commit 99592d598eca62bdbbf62b59941c189176dfc614 upstream.

This patch adds the proper version check to allow building on 3.18.y.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: allow LTTng to be built within kernel tree

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.7.0-rc1

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Building the event list fails on fragmented memory

On a small arm imx6 solo with 256MB RAM it often happens that memory
becomes fragmented rather quickly, so that kmalloc will not be able to
get enough consecutive pages (enocuntered for example if you enable all
kernel events: lttng enable-event -k syscall --all).

This patch switches the allocation to vmalloc. Tested for x86 on Ubuntu
12.04 Lts and on imx6 solo 256MB RAM

If this patch is not applied, you can identify low and/or fragmented
memory failures by looking at the kernel ring buffer (please ignore DMA,
it is due to some memory setup misconfiguration, should read Normal):

...
[  321.993820] lttng-sessiond: page allocation failure: order:4, mode:0x1040d0
...
[  321.994711] lowmem_reserve[]: 0 0 0
[  321.994727] DMA: 801*4kB (UEMC) 424*8kB (EMC) 355*16kB (UEMC) 344*32kB (MC) 340*64kB (C) 8*128kB (C) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB 0*32768kB = 46068kB

[ Edit by Mathieu: use vzalloc() rather than vmalloc() + memset 0. ]

Signed-off-by: Martin Leisener <martin@leisener.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: use after free on metadata cache reallocation

When the metadata cache is expanded (reallocated) by
lttng_metadata_printf(), the metadata cache reader
(lttng_metadata_output_channel()) may use freed memory, because the
metadata cache is not protected from concurrent read accesses. The
metadata cache updates are protected from each other by the sessions
mutex, but metadata cache reads do not hold the sessions mutex.
Actually, the comment on top of lttng_metadata_output_channel() stating
"We have exclusive access to our metadata buffer (protected by the
sessions_mutex)" is simply wrong, because this mutex is never held when
calling lttng_metadata_output_channel().

Promote the per-stream lock to the metadata cache used by each of those
metadata streams, thus ensuring mutual exclusion between metadata cache
reallocation and readers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: version checks for kernel 4.0

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Incorrect Ubuntu kernel patchlevel

The kernel version used should be the one in Makefile and generated
version.h, not the one tweaked by Ubuntu as "0" in the built package.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: cpu-id context should use int type

cycles_t makes no sense as type for cpu-id context.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Implement cpu-id context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Implement cpu_id context for filtering

cpu_id context can now be used for filtering, e.g.:

lttng enable-event -k sched_switch --filter '$ctx.cpu_id==1'

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: context printk mismatch on error

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup: misleading comment about deferrable timer

Timer in lttng-modules are not deferrable, because we cannot hook into
the Linux kernel CPU idle events, because no notifiers are exposed for
those.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: arm-32 build

The current master branch of lttng-modules doesn't seem to compile for
arm-32 builds.

The patch below repairs the build for arm (and still builds on a x86)
(tested on Ubuntu 12.04 LTS x86 + imx6 solo)

Signed-off-by: Martin Leisener <martin@leisener.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Update kmem event for Ubuntu's 3.16 kernel

The upstream patch in question in commit 72906e1 was cherry-picked into
Ubuntu's 3.16 kernel backport branch (called lts-utopic). The version
check should also include this branch.

The other backport branch, lts-vivid, and all following ones will be
covered by the standard

  LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)

check, so should not require other workarounds.

References #889.

Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: RHEL 7.1 block instrumentation

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add RHEL version macros

RHEL 7.1 has backported upstream patches that change the kvm.h
tracepoint prototype. Add version check specific to RHEL to handle this
case.

RHEL 7.x has the required fixes backported that allow removing the 3.10
blacklist check for them, so take this into account.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add missing parenthesis in ubuntu version check

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: remove regmap instrumentation for kernels < 4.1

Modifications to regmap.h instrumentation in mainline Linux kernel has
been no less than erratic. First, the public instrumentation header
regmap.h include a private driver header in Linux 4.0. Then, regmap.h
is moved to the private driver directory in Linux 4.1. To make things
worse, the 4.0 commit has been picked into stable branches of the Linux
kernel.

Since this does not appear to be an instrumentation of utmost
importance, only build this instrumentation probe if the private header
is found in the driver directory (need full kernel sources).

This removes regmap instrumentation for older kernels.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Update kmem event for recent Ubuntu kernel

Ubuntu backported a patch into their 3.13 (Trusty) branch which
changes kmem event definition.

Upstream commit
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=99592d598eca62bdbbf62b59941c189176dfc614
first appears in 4.0 (and was later backported to 3.19.2).
We already have the proper check for this.

This corresponds to Ubuntu commit
http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git/commit/?id=d938e4bff1089a1f4757ed94a5cace803c6a363b
which was first released with 3.13.0-50.82.
This required adding a new check specifically for the
Ubuntu version.

Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: missing statedump end event when block device listing available

Incorrect handling of lttng_enumerate_block_devices() return value of 0
(which means "ok"), causing do_lttng_statedump() to return early.

To causes missing "lttng_statedump_end" in traces where block device
enumeration is available (CONFIG_KALLSYMS=y).

Reported-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: don't generate incorrect macros for debian/ubuntu version check

When the debian/ubuntu macros are unset, we end up generating macros
that have no right hand operand to "+", which seems to break compilation
on some compilers, even though it will always be optimized away.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Revert "Fix: build against Ubuntu kernels"

This reverts commit a748963b76f353d459a3faf85eecc96f52811eee.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: build against Ubuntu kernels

Recent Ubuntu kernels appear to define DEBIAN_API_VERSION, but they are
not really a Debian kernel per-se: the abi-debian-version.sh cannot find
the expected Debian kernel version string layout.

Therefore, change the conditional check to use directly the
LTTNG_DEBIAN_VERSION_CODE define, which is defined only when the
abi-debian-version.sh script figures out it builds against a Debian
kernel.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add namespace info in sched_fork and statedump

Modifications to sched_fork : Add a field for parent and child pid
namespace inode (as in /proc/$PID/ns/pid). Also add a field for the
child VTID.

Modifications to lttng_statedump_process_state : Add a field for the pid
namespace inode of the task.

Signed-off-by: Sebastien Lorrain <sebastien.lorrain01@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: ext4 instrumentation: flags parameter did not exist prior to 3.11

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: printk instrumentation: remove "condition" tracepoints

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: regmap build against kernel 4.0 kernel headers

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add mmu_valid_gen field to mmutrace events

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add missing x86 mmutrace kernel header include

Needed to ensure the compiler checks prototypes of lttng-modules probe
against the kernel prototypes.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: x86 mmutrace event extra field for kernels >= 3.11

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: remove execute flag from kvm.h file

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: build x86 kvm probes on kernels >= 4.1-rc1

iodev.h has moved to include/kvm/.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: compilation on 4.1-rc1 kernel, remove unused WB_WORK_REASON

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: 4.1-rc1 Linux build and regmap instrumentation

regmap header has been privatized.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: don't clash with older Debian kernel versions

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: update get_pfnblock_flags_mask wrapper for debian kernels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: discover Debian API

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Update README.md to match reality: kernels >= 2.6.36 are supported

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: atomic.h wrapper for kernels < 2.6.37

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: disable x86 kvm instrumentation for kernels < 2.6.38

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add missing types.h include for older kernels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add hlist lttng wrappers

For older kernels (e.g. 2.6.38).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add struct file_handle forward declaration

For older kernels (e.g. 2.6.38).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: string length calculation reversed user vs kernel args

Only affects feature recently merged into master.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: use lttng_rcu_dereference within lttng-syscalls.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: add lttng rcu wrapper to allow tracing RCU

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: double-unlock of session mutex

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: check that class and instance prototype match

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: lttng-events.h check function takes void

The kernel nerver really emit this, but our function prototype should
not take the void *data parameter, so we are similar to the the "with
argument" prototype, which does not have the private data pointer.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: regmap instrumentation for Linux 3.19.4 and 4.0

This is necessary after commit c6b570d97c0e77f570bb6b2ed30d372b2b1e9aae
in the kernel.

[ Edit by Mathieu Desnoyers: fix DECLARE_EVENT_CLASS regmap_reg too. ]

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: kernels >= 2.6.33 put utsrelease.h in generated/

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: Include utsrelease.h in lttng-kernel-version.h

Including module.h includes other headers, which is an issue for the
get_pfnblock_flags_mask wrapper.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: ext4 ext4_da_write_pages instrumentation for kernels < 3.11.0

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>