Commit Graph

950367 Commits

Author SHA1 Message Date
Tom Zanussi
bd82631d7c tracing: Add support for dynamic strings to synthetic events
Currently, sythetic events only support static string fields such as:

  # echo 'test_latency u64 lat; char somename[32]' > /sys/kernel/debug/tracing/synthetic_events

Which is fine, but wastes a lot of space in the event.

It also prevents the most commonly-defined strings in the existing
trace events e.g. those defined using __string(), from being passed to
synthetic events via the trace() action.

With this change, synthetic events with dynamic fields can be defined:

  # echo 'test_latency u64 lat; char somename[]' > /sys/kernel/debug/tracing/synthetic_events

And the trace() action can be used to generate events using either
dynamic or static strings:

  # echo 'hist:keys=name:lat=common_timestamp.usecs-$ts0:onmatch(sys.event).test_latency($lat,name)' > /sys/kernel/debug/tracing/events

The synthetic event dynamic strings are implemented in the same way as
the existing __data_loc strings and appear as such in the format file.

[ <rostedt@goodmis.org>: added __set_synth_event_print_fmt() changes:

  I added the following to make it work with trace-cmd. Dynamic strings
  must have __get_str() for events in the print_fmt otherwise it can't be
  parsed correctly. ]

Link: https://lore.kernel.org/r/cover.1601588066.git.zanussi@kernel.org
Link: https://lkml.kernel.org/r/3ed35b6d0e390f5b94cb4a9ba1cc18f5982ab277.1601848695.git.zanussi@kernel.org

Tested-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-10-05 19:32:18 -04:00
Tom Zanussi
63a1e5de30 tracing: Save normal string variables
String variables created as field variables and save variables are
already handled properly by having their values copied when set.  The
same isn't done for normal variables, but needs to be - simply saving
a pointer to a string contained in an old event isn't sufficient,
since that event's data may quickly become overwritten and therefore a
string pointer to it could yield garbage.

This change uses the same mechanism as field variables and simply
appends the new strings to the existing per-element field_var_str[]
array allocated for that purpose.

Link: https://lkml.kernel.org/r/1c1a03798b02e67307412a0c719d1bfb69b13007.1601848695.git.zanussi@kernel.org

Fixes: 02205a6752 (tracing: Add support for 'field variables')
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-10-05 18:13:53 -04:00
Tom Zanussi
8fbeb52a59 tracing: Fix parse_synth_field() error handling
synth_field_size() returns either a positive size or an error (zero or
a negative value). However, the existing code assumes the only error
value is 0. It doesn't handle negative error codes, as it assigns
directly to field->size (a size_t; unsigned), thereby interpreting the
error code as a valid size instead.

Do the test before assignment to field->size.

[ axelrasmussen@google.com: changelog addition, first paragraph above ]

Link: https://lkml.kernel.org/r/9b6946d9776b2eeb43227678158196de1c3c6e1d.1601848695.git.zanussi@kernel.org

Fixes: 4b147936fa (tracing: Add support for 'synthetic' events)
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-10-05 18:13:53 -04:00
Tom Zanussi
4a4a56b4e7 tracing: Change STR_VAR_MAX_LEN
32 is too small for this value, and anyway it makes more sense to use
MAX_FILTER_STR_VAL, as this is also the value used for variable-length
__strings.

Link: https://lkml.kernel.org/r/6adfd1668ac1fd8670bd58206944a762061a5559.1601848695.git.zanussi@kernel.org

Tested-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-10-05 18:13:53 -04:00
Qiujun Huang
fdda88d31a ftrace: Fix some typos in comment
s/coorditate/coordinate/
s/emty/empty/
s/preeptive/preemptive/
s/succes/success/
s/carefule/careful/

Link: https://lkml.kernel.org/r/20201002143126.2890-1-hqjagain@gmail.com

Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-10-02 14:05:48 -04:00
Steven Rostedt (VMware)
fdb46faeab x86: Use tracepoint_enabled() for msr tracepoints instead of open coding it
7f47d8cc03 ("x86, tracing, perf: Add trace point for MSR accesses") added
tracing of msr read and write, but because of complexity in having
tracepoints in headers, and even more so for a core header like msr.h, not
to mention the bloat a tracepoint adds to inline functions, a helper
function is needed to be called from the header.

Use the new tracepoint_enabled() macro in tracepoint-defs.h to test if the
tracepoint is active before calling the helper function, instead of open
coding the same logic, which requires knowing the internals of a tracepoint.

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-28 10:36:02 -04:00
Steven Rostedt (VMware)
c65fc2276f mm/page_ref: Convert the open coded tracepoint enabled to the new helper
As more use cases of checking if a tracepoint is enabled in a header are
coming to fruition, a helper macro, tracepoint_enabled(), has been added to
check if a tracepoint is enabled or not, and can be used with minimal header
requirements (avoid "include hell"). Convert the page_ref logic over to the
new helper macro.

Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-25 18:01:48 -04:00
Steven Rostedt (VMware)
afbe797317 tracepoints: Add helper to test if tracepoint is enabled in a header
As tracepoints are discouraged from being added in a header because it can
cause side effects if other tracepoints are in headers, as well as bloat the
kernel as the trace_<tracepoint>() function is not a small inline, the common
workaround is to add a function call that calls a wrapper function in a
C file that then calls the tracepoint. But as function calls add overhead,
this function should only be called when the tracepoint in question is
enabled. To get around this overhead, a static_branch can be used to only
have the tracepoint wrapper get called when the tracepoint is enabled.

Add a tracepoint_enabled(tp) macro that gets passed the name of the
tracepoint, and this becomes a static_branch that is enabled when the
tracepoint is enabled and is a nop when the tracepoint is disabled.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-25 18:01:35 -04:00
Masami Hiramatsu
720dee53ad tracing/boot: Initialize per-instance event list in early boot
Initialize per-instance event list in early boot time (before
initializing instance directory on tracefs). This fixes boot-time
tracing to correctly handle the boot-time per-instance settings.

Link: https://lkml.kernel.org/r/160096560826.182763.17110991546046128881.stgit@devnote2

Fixes: 4114fbfd02 ("tracing: Enable creating new instance early boot")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-25 15:36:03 -04:00
Masami Hiramatsu
fd264ce96c Documentation: tracing: Add the startup timing of boot-time tracing
Add the note about when to start the boot-time tracing.
This will be needed for the people who wants to trace
earlier boot sequence.

Link: https://lkml.kernel.org/r/159974156678.478751.10215894815285734481.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
ba0fbfbb21 tracing/boot, kprobe, synth: Initialize boot-time tracing earlier
Initialize boot-time tracing in core_initcall_sync instead of
fs_initcall, and initialize required tracers (kprobes and synth)
in core_initcall. This will allow the boot-time tracing to trace
__init code from the beginning of postcore_initcall stage.

Link: https://lkml.kernel.org/r/159974155727.478751.7486926132902849578.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
4114fbfd02 tracing: Enable creating new instance early boot
Enable creating new trace_array instance in early boot stage.
If the instances directory is not created, postpone it until
the tracefs is initialized.

Link: https://lkml.kernel.org/r/159974154763.478751.6289753509587233103.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
a838deab4e tracing: Enable adding dynamic events early stage
Split the event fields initialization from creating new event directory.
This allows the boot-time tracing to define dynamic events before
initializing events directory on tracefs.

Link: https://lkml.kernel.org/r/159974153790.478751.3475515065034825374.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
ac343da7bc tracing: Define event fields early stage
Define event fields at early stage so that boot-time tracing can
access the event fields (like per-event filter setting).

Link: https://lkml.kernel.org/r/159974152862.478751.2023768466808361350.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
36dadef23f kprobes: Init kprobes in early_initcall
Init kprobes feature in early_initcall as same as jump_label and
dynamic_debug does, so that we can use kprobes events in earlier
boot stage.

Link: https://lkml.kernel.org/r/159974151897.478751.8342374158615496628.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:04 -04:00
Masami Hiramatsu
8f2a59968f selftests/ftrace: Add %return suffix tests
Add kprobe %return suffix testcase and syntax error tests
for %return suffix.

Link: https://lkml.kernel.org/r/159972817653.428528.9180599115849301184.stgit@devnote2

Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
19c311ae7c Documentation: tracing: boot: Add an example of tracing function-calls
Add an example of tracing function calls on a specific function.

Link: https://lkml.kernel.org/r/159972816669.428528.12390560334549382316.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
638e476d1d Documentation: tracing: Add %return suffix description
Add a description of the %return suffix option for kprobe event and
uprobe event.

Link: https://lkml.kernel.org/r/159972815624.428528.10450874184415697524.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
3dd3aae32d tracing/uprobes: Support perf-style return probe
Support perf-style return probe ("SYMBOL%return") for uprobe events
as same as kprobe events does.

Link: https://lkml.kernel.org/r/159972814601.428528.7641183316212425445.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
4725cd8997 tracing/kprobes: Support perf-style return probe
Support perf-style return probe ("SYMBOL%return") for kprobe events.
This will allow boot-time tracing user to define a return probe event.

Link: https://lkml.kernel.org/r/159972813535.428528.4437029657208468954.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
c51ba51798 Documentation: tracing: Add tracing_on option to boot-time tracer
Add tracing_on option description to the boot-time tracer.

Link: https://lkml.kernel.org/r/159978523520.485820.9250337223076929279.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Masami Hiramatsu
8490db06f9 tracing/boot: Add per-instance tracing_on option support
Add per-instance tracing_on option, which will be useful with
traceon/traceoff event trigger actions. For example, if we
disable tracing_on by default and set traceon and traceoff on
a pair of events, we can trace functions between the pair of
events.

Link: https://lkml.kernel.org/r/159972811538.428528.2561315102284268611.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:03 -04:00
Davidlohr Bueso
40d14da383 fgraph: Convert ret_stack tasklist scanning to rcu
It seems that alloc_retstack_tasklist() can also take a lockless
approach for scanning the tasklist, instead of using the big global
tasklist_lock. For this we also kill another deprecated and rcu-unsafe
tsk->thread_group user replacing it with for_each_process_thread(),
maintaining semantics.

Here tasklist_lock does not protect anything other than the list
against concurrent fork/exit. And considering that the whole thing
is capped by FTRACE_RETSTACK_ALLOC_SIZE (32), it should not be a
problem to have a pontentially stale, yet stable, list. The task cannot
go away either, so we don't risk racing with ftrace_graph_exit_task()
which clears the retstack.

The tsk->ret_stack management is not protected by tasklist_lock, being
serialized with the corresponding publish/subscribe barriers against
concurrent ftrace_push_return_trace(). In addition this plays nicer
with cachelines by avoiding two atomic ops in the uncontended case.

Link: https://lkml.kernel.org/r/20200907013326.9870-1-dave@stgolabs.net

Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:02 -04:00
Dan Carpenter
eb8d8b4c98 tracing: remove a pointless assignment
The "tr" is a stack variable so setting it to NULL before a return is
a no-op.  Delete the assignment.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:02 -04:00
Jarkko Sakkinen
f3d3642661 kprobes: Use module_name() macro
It is advised to use module_name() macro instead of dereferencing mod->name
directly. This makes sense for consistencys sake and also it prevents a
hard dependency to CONFIG_MODULES.

Link: https://lkml.kernel.org/r/20200818050857.117998-1-jarkko.sakkinen@linux.intel.com

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mm@kvack.org
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will@kernel.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:02 -04:00
Xianting Tian
b427e765bd tracing: Use __this_cpu_read() in trace_buffered_event_enable()
The code is executed with preemption disabled, so it's
safe to use __this_cpu_read().

Link: https://lkml.kernel.org/r/20200813112803.12256-1-tian.xianting@h3c.com

Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:02 -04:00
Randy Dunlap
5c8c206e43 tracing: Delete repeated words in comments
Drop repeated words in kernel/trace/.
{and, the, not}

Link: https://lkml.kernel.org/r/20200807033259.13778-1-rdunlap@infradead.org

Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-21 21:06:02 -04:00
Wei Yang
22c36b1826 tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer
Current tracing_init_dentry() return a d_entry pointer, while is not
necessary. This function returns NULL on success or error on failure,
which means there is no valid d_entry pointer return.

Let's return 0 on success and negative value for error.

Link: https://lkml.kernel.org/r/20200712011036.70948-5-richard.weiyang@linux.alibaba.com

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:14 -04:00
Wei Yang
dc300d77b8 tracing: toplevel d_entry already initialized
Currently we have following call flow:

    tracer_init_tracefs()
        tracing_init_dentry()
        event_trace_init()
            tracing_init_dentry()

This shows tracing_init_dentry() is called twice in this flow and this
is not necessary.

Let's remove the second one when it is for sure be properly initialized.

Link: https://lkml.kernel.org/r/20200712011036.70948-4-richard.weiyang@linux.alibaba.com

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:14 -04:00
Masami Hiramatsu
5675fd4ef5 tools/bootconfig: Add --init option for bconf2ftrace.sh
Since the ftrace current setting may conflict with the new setting
from bootconfig, add the --init option to initialize ftrace before
setting for bconf2ftrace.sh.

E.g.
 $ bconf2ftrace.sh --init boottrace.bconf

This initialization method copied from selftests/ftrace.

Link: https://lkml.kernel.org/r/159704853203.175360.17029578033994278231.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Masami Hiramatsu
2b86062a34 tools/bootconfig: Add a script to generates bootconfig from ftrace
Add a ftrace2bconf.sh under tools/bootconfig/scripts which generates
a bootconfig file from the current ftrace settings.

To read the ftrace settings, ftrace2bconf.sh requires the root
privilege (or sudo). The ftrace2bconf.sh will output the bootconfig
to stdout and error messages to stderr, so usually you'll run it as

 # ftrace2bconf.sh > ftrace.bconf

Note that some ftrace configurations are not supported. For example,
function-call/callgraph trace/notrace settings are not supported because
the wildcard has been expanded and lost in the ftrace anymore.

Link: https://lkml.kernel.org/r/159704852163.175360.16738029520293360558.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Masami Hiramatsu
7e66ef0046 tools/bootconfig: Add a script to generate ftrace shell-command from bootconfig
Add a bconf2ftrace.sh under tools/bootconfig/scripts which generates
a shell script to setup boot-time trace from bootconfig file for testing
the bootconfig.

bconf2ftrace.sh will take a bootconfig file (includes boot-time tracing)
and convert it into a shell-script which is almost same as the boot-time
tracer does.
If --apply option is given, it also tries to apply those command to the
running kernel, which requires the root privilege (or sudo).

For example, if you just want to confirm the shell commands, save
the output as below.

 # bconf2ftrace.sh ftrace.bconf > ftrace.sh

Or, you can apply it directly.

 # bconf2ftrace.sh --apply ftrace.bconf

Note that some boot-time tracing parameters under kernel.* are not able
to set via tracefs nor procfs (e.g. tp_printk, traceoff_on_warning.),
so those are ignored.

Link: https://lkml.kernel.org/r/159704851101.175360.15119132351139842345.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Masami Hiramatsu
483ce6708d tools/bootconfig: Make all functions static
Make all functions static except for main(). This is just a cleanup.

Link: https://lkml.kernel.org/r/159704850135.175360.12465608936326167517.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Masami Hiramatsu
e4f70b7bad tools/bootconfig: Add list option
Add list option (-l) to show the bootconfig in the list style.
This is same output of /proc/bootconfig. So users can check
how their bootconfig will be shown in procfs. This will help
them to write a user-space script to parse the /proc/bootconfig.

Link: https://lkml.kernel.org/r/159704849087.175360.8761890802048625207.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Masami Hiramatsu
d052e1c690 tools/bootconfig: Show bootconfig compact tree from bootconfig file
Show the bootconfig compact tree from the bootconfig file
instead of an initrd if the given file has no magic number
and is smaller than 32KB.

User can use this for checking the syntax error or output
checking before applying the bootconfig to initrd.

Link: https://lkml.kernel.org/r/159704848156.175360.6621139371000789360.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:13 -04:00
Jason Yan
a27026e95b bootconfig: init: make xbc_namebuf static
This eliminates the following sparse warning:

init/main.c:306:6: warning: symbol 'xbc_namebuf' was not declared.
Should it be static?

Link: https://lkml.kernel.org/r/20200915070324.2239473-1-yanaijie@huawei.com

Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 22:17:05 -04:00
Masami Hiramatsu
82d083ab60 kprobes: tracing/kprobes: Fix to kill kprobes on initmem after boot
Since kprobe_event= cmdline option allows user to put kprobes on the
functions in initmem, kprobe has to make such probes gone after boot.
Currently the probes on the init functions in modules will be handled
by module callback, but the kernel init text isn't handled.
Without this, kprobes may access non-exist text area to disable or
remove it.

Link: https://lkml.kernel.org/r/159972810544.428528.1839307531600646955.stgit@devnote2

Fixes: 970988e19e ("tracing/kprobe: Add kprobe_event= boot parameter")
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 14:27:24 -04:00
Tom Rix
46bbe5c671 tracing: fix double free
clang static analyzer reports this problem

trace_events_hist.c:3824:3: warning: Attempt to free
  released memory
    kfree(hist_data->attrs->var_defs.name[i]);

In parse_var_defs() if there is a problem allocating
var_defs.expr, the earlier var_defs.name is freed.
This free is duplicated by free_var_defs() which frees
the rest of the list.

Because free_var_defs() has to run anyway, remove the
second free fom parse_var_defs().

Link: https://lkml.kernel.org/r/20200907135845.15804-1-trix@redhat.com

Cc: stable@vger.kernel.org
Fixes: 30350d65ac ("tracing: Add variable support to hist triggers")
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 13:16:40 -04:00
Tobias Klauser
54fa9ba564 ftrace: Let ftrace_enable_sysctl take a kernel pointer buffer
Commit 32927393dc ("sysctl: pass kernel pointers to ->proc_handler")
changed ctl_table.proc_handler to take a kernel pointer. Adjust the
signature of ftrace_enable_sysctl to match ctl_table.proc_handler which
fixes the following sparse warning:

kernel/trace/ftrace.c:7544:43: warning: incorrect type in argument 3 (different address spaces)
kernel/trace/ftrace.c:7544:43:    expected void *
kernel/trace/ftrace.c:7544:43:    got void [noderef] __user *buffer

Link: https://lkml.kernel.org/r/20200907093207.13540-1-tklauser@distanz.ch

Fixes: 32927393dc ("sysctl: pass kernel pointers to ->proc_handler")
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 13:15:56 -04:00
Sebastian Andrzej Siewior
795d6379a4 tracing: Make the space reserved for the pid wider
For 64bit CONFIG_BASE_SMALL=0 systems PID_MAX_LIMIT is set by default to
4194304. During boot the kernel sets a new value based on number of CPUs
but no lower than 32768. It is 1024 per CPU so with 128 CPUs the default
becomes 131072 which needs six digits.
This value can be increased during run time but must not exceed the
initial upper limit.

Systemd sometime after v241 sets it to the upper limit during boot. The
result is that when the pid exceeds five digits, the trace output is a
little hard to read because it is no longer properly padded (same like
on big iron with 98+ CPUs).

Increase the pid padding to seven digits.

Link: https://lkml.kernel.org/r/20200904082331.dcdkrr3bkn3e4qlg@linutronix.de

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 12:42:11 -04:00
Adrian Hunter
478ece9573 ftrace: Fix missing synchronize_rcu() removing trampoline from kallsyms
Add synchronize_rcu() after list_del_rcu() in
ftrace_remove_trampoline_from_kallsyms() to protect readers of
ftrace_ops_trampoline_list (in ftrace_get_trampoline_kallsym)
which is used when kallsyms is read.

Link: https://lkml.kernel.org/r/20200901091617.31837-1-adrian.hunter@intel.com

Fixes: fc0ea795f5 ("ftrace: Add symbols for ftrace trampolines")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 12:22:42 -04:00
Miroslav Benes
d5e47505e0 ftrace: Free the trampoline when ftrace_startup() fails
Commit fc0ea795f5 ("ftrace: Add symbols for ftrace trampolines")
missed to remove ops from new ftrace_ops_trampoline_list in
ftrace_startup() if ftrace_hash_ipmodify_enable() fails there. It may
lead to BUG if such ops come from a module which may be removed.

Moreover, the trampoline itself is not freed in this case.

Fix it by calling ftrace_trampoline_free() during the rollback.

Link: https://lkml.kernel.org/r/20200831122631.28057-1-mbenes@suse.cz

Fixes: fc0ea795f5 ("ftrace: Add symbols for ftrace trampolines")
Fixes: f8b8be8a31 ("ftrace, kprobes: Support IPMODIFY flag to find IP modify conflict")
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 12:19:08 -04:00
Masami Hiramatsu
3031313eb3 kprobes: Fix to check probe enabled before disarm_kprobe_ftrace()
Commit 0cb2f1372b ("kprobes: Fix NULL pointer dereference at
kprobe_ftrace_handler") fixed one bug but not completely fixed yet.
If we run a kprobe_module.tc of ftracetest, kernel showed a warning
as below.

# ./ftracetest test.d/kprobe/kprobe_module.tc
=== Ftrace unit tests ===
[1] Kprobe dynamic event - probing module
...
[   22.400215] ------------[ cut here ]------------
[   22.400962] Failed to disarm kprobe-ftrace at trace_printk_irq_work+0x0/0x7e [trace_printk] (-2)
[   22.402139] WARNING: CPU: 7 PID: 200 at kernel/kprobes.c:1091 __disarm_kprobe_ftrace.isra.0+0x7e/0xa0
[   22.403358] Modules linked in: trace_printk(-)
[   22.404028] CPU: 7 PID: 200 Comm: rmmod Not tainted 5.9.0-rc2+ #66
[   22.404870] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
[   22.406139] RIP: 0010:__disarm_kprobe_ftrace.isra.0+0x7e/0xa0
[   22.406947] Code: 30 8b 03 eb c9 80 3d e5 09 1f 01 00 75 dc 49 8b 34 24 89 c2 48 c7 c7 a0 c2 05 82 89 45 e4 c6 05 cc 09 1f 01 01 e8 a9 c7 f0 ff <0f> 0b 8b 45 e4 eb b9 89 c6 48 c7 c7 70 c2 05 82 89 45 e4 e8 91 c7
[   22.409544] RSP: 0018:ffffc90000237df0 EFLAGS: 00010286
[   22.410385] RAX: 0000000000000000 RBX: ffffffff83066024 RCX: 0000000000000000
[   22.411434] RDX: 0000000000000001 RSI: ffffffff810de8d3 RDI: ffffffff810de8d3
[   22.412687] RBP: ffffc90000237e10 R08: 0000000000000001 R09: 0000000000000001
[   22.413762] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807c478640
[   22.414852] R13: ffffffff8235ebc0 R14: ffffffffa00060c0 R15: 0000000000000000
[   22.415941] FS:  00000000019d48c0(0000) GS:ffff88807d7c0000(0000) knlGS:0000000000000000
[   22.417264] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.418176] CR2: 00000000005bb7e3 CR3: 0000000078f7a000 CR4: 00000000000006a0
[   22.419309] Call Trace:
[   22.419990]  kill_kprobe+0x94/0x160
[   22.420652]  kprobes_module_callback+0x64/0x230
[   22.421470]  notifier_call_chain+0x4f/0x70
[   22.422184]  blocking_notifier_call_chain+0x49/0x70
[   22.422979]  __x64_sys_delete_module+0x1ac/0x240
[   22.423733]  do_syscall_64+0x38/0x50
[   22.424366]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   22.425176] RIP: 0033:0x4bb81d
[   22.425741] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e0 ff ff ff f7 d8 64 89 01 48
[   22.428726] RSP: 002b:00007ffc70fef008 EFLAGS: 00000246 ORIG_RAX: 00000000000000b0
[   22.430169] RAX: ffffffffffffffda RBX: 00000000019d48a0 RCX: 00000000004bb81d
[   22.431375] RDX: 0000000000000000 RSI: 0000000000000880 RDI: 00007ffc70fef028
[   22.432543] RBP: 0000000000000880 R08: 00000000ffffffff R09: 00007ffc70fef320
[   22.433692] R10: 0000000000656300 R11: 0000000000000246 R12: 00007ffc70fef028
[   22.434635] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
[   22.435682] irq event stamp: 1169
[   22.436240] hardirqs last  enabled at (1179): [<ffffffff810df542>] console_unlock+0x422/0x580
[   22.437466] hardirqs last disabled at (1188): [<ffffffff810df19b>] console_unlock+0x7b/0x580
[   22.438608] softirqs last  enabled at (866): [<ffffffff81c0038e>] __do_softirq+0x38e/0x490
[   22.439637] softirqs last disabled at (859): [<ffffffff81a00f42>] asm_call_on_stack+0x12/0x20
[   22.440690] ---[ end trace 1e7ce7e1e4567276 ]---
[   22.472832] trace_kprobe: This probe might be able to register after target module is loaded. Continue.

This is because the kill_kprobe() calls disarm_kprobe_ftrace() even
if the given probe is not enabled. In that case, ftrace_set_filter_ip()
fails because the given probe point is not registered to ftrace.

Fix to check the given (going) probe is enabled before invoking
disarm_kprobe_ftrace().

Link: https://lkml.kernel.org/r/159888672694.1411785.5987998076694782591.stgit@devnote2

Fixes: 0cb2f1372b ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-09-18 11:50:51 -04:00
Linus Torvalds
856deb866d Linux 5.9-rc5 2020-09-13 16:06:00 -07:00
Linus Torvalds
5712c3ed54 ARM: SoC fixes
A collection of fixes I've been accruing over the last few weeks, none
 of them have been severe enough to warrant flushing the queue but it's
 been long enough now that it's a good idea to send them in.
 
 A handful of them are fixups for QSPI DT/bindings/compatibles, some
 smaller fixes for system DMA clock control and TMU interrupts on i.MX,
 a handful of fixes for OMAP, including a fix for DSI (display) on omap5.
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Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC fixes from Olof Johansson:
 "A collection of fixes I've been accruing over the last few weeks, none
  of them have been severe enough to warrant flushing the queue but it's
  been long enough now that it's a good idea to send them in.

  A handful of them are fixups for QSPI DT/bindings/compatibles, some
  smaller fixes for system DMA clock control and TMU interrupts on i.MX,
  a handful of fixes for OMAP, including a fix for DSI (display) on
  omap5"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (27 commits)
  arm64: dts: ns2: Fixed QSPI compatible string
  ARM: dts: BCM5301X: Fixed QSPI compatible string
  ARM: dts: NSP: Fixed QSPI compatible string
  ARM: dts: bcm: HR2: Fixed QSPI compatible string
  dt-bindings: spi: Fix spi-bcm-qspi compatible ordering
  ARM: dts: imx6sx: fix the pad QSPI1B_SCLK mux mode for uart3
  arm64: dts: imx8mp: correct sdma1 clk setting
  arm64: dts: imx8mq: Fix TMU interrupt property
  ARM: dts: imx7d-zii-rmu2: fix rgmii phy-mode for ksz9031 phy
  ARM: dts: vfxxx: Add syscon compatible with OCOTP
  ARM: dts: imx6q-logicpd: Fix broken PWM
  arm64: dts: imx: Add missing imx8mm-beacon-kit.dtb to build
  ARM: dts: imx6q-prtwd2: Remove unneeded i2c unit name
  ARM: dts: imx6qdl-gw51xx: Remove unneeded #address-cells/#size-cells
  ARM: dts: imx7ulp: Correct gpio ranges
  ARM: dts: ls1021a: fix QuadSPI-memory reg range
  arm64: defconfig: Enable ptn5150 extcon driver
  arm64: defconfig: Enable USB gadget with configfs
  ARM: configs: Update Integrator defconfig
  ARM: dts: omap5: Fix DSI base address and clocks
  ...
2020-09-13 14:54:40 -07:00
Linus Torvalds
e4c26faa42 USB/Thunderbolt fixes for 5.9-rc5
Here are some small USB and Thunderbolt driver fixes for 5.9-rc5.
 
 Nothing huge, just a number of bugfixes and new device ids for problems
 reported:
 	- new USB serial driver ids
 	- bug fixes for syzbot reported problems
 	- typec driver fixes
 	- thunderbolt driver fixes
 	- revert of reported broken commit
 
 All of these have been in linux-next with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB/Thunderbolt fixes from Greg KH:
 "Here are some small USB and Thunderbolt driver fixes for 5.9-rc5.

  Nothing huge, just a number of bugfixes and new device ids for
  problems reported:

   - new USB serial driver ids

   - bug fixes for syzbot reported problems

   - typec driver fixes

   - thunderbolt driver fixes

   - revert of reported broken commit

  All of these have been in linux-next with no reported issues"

* tag 'usb-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: typec: intel_pmc_mux: Do not configure SBU and HSL Orientation in Alternate modes
  usb: typec: intel_pmc_mux: Do not configure Altmode HPD High
  usb: core: fix slab-out-of-bounds Read in read_descriptors
  Revert "usb: dwc3: meson-g12a: fix shared reset control use"
  usb: typec: ucsi: acpi: Check the _DEP dependencies
  usb: typec: intel_pmc_mux: Un-register the USB role switch
  usb: Fix out of sync data toggle if a configured device is reconfigured
  USB: serial: option: support dynamic Quectel USB compositions
  USB: serial: option: add support for SIM7070/SIM7080/SIM7090 modules
  thunderbolt: Use maximum USB3 link rate when reclaiming if link is not up
  thunderbolt: Disable ports that are not implemented
  USB: serial: ftdi_sio: add IDs for Xsens Mti USB converter
2020-09-13 09:23:54 -07:00
Linus Torvalds
6c7247f625 Staging / IIO driver fixes for 5.9-rc5
Here are a number of Staging and IIO driver fixes for 5.9-rc5.
 
 The majority of these are IIO driver fixes, to resolve a timestamp issue
 that was recently found to affect a bunch of IIO drivers.
 
 The other fixes in here are:
 	- small IIO driver fixes
 	- greybus driver fix
 	- counter driver fix (came in through the IIO fixes tree)
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging/IIO driver fixes from Greg KH:
 "Here are a number of staging and IIO driver fixes for 5.9-rc5.

  The majority of these are IIO driver fixes, to resolve a timestamp
  issue that was recently found to affect a bunch of IIO drivers.

  The other fixes in here are:

   - small IIO driver fixes

   - greybus driver fix

   - counter driver fix (came in through the IIO fixes tree)

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (23 commits)
  iio: adc: mcp3422: fix locking on error path
  iio: adc: mcp3422: fix locking scope
  iio: adc: meson-saradc: Use the parent device to look up the calib data
  iio:adc:max1118 Fix alignment of timestamp and data leak issues
  iio:adc:ina2xx Fix timestamp alignment issue.
  iio:adc:ti-adc084s021 Fix alignment and data leak issues.
  iio:adc:ti-adc081c Fix alignment and data leak issues
  iio:magnetometer:ak8975 Fix alignment and data leak issues.
  iio:light:ltr501 Fix timestamp alignment issue.
  iio:light:max44000 Fix timestamp alignment and prevent data leak.
  iio:chemical:ccs811: Fix timestamp alignment and prevent data leak.
  iio:proximity:mb1232: Fix timestamp alignment and prevent data leak.
  iio:accel:mma7455: Fix timestamp alignment and prevent data leak.
  iio:accel:bmc150-accel: Fix timestamp alignment and prevent data leak.
  iio:accel:mma8452: Fix timestamp alignment and prevent data leak.
  iio: accel: kxsd9: Fix alignment of local buffer.
  iio: adc: rockchip_saradc: select IIO_TRIGGERED_BUFFER
  iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set
  counter: microchip-tcb-capture: check the correct variable
  iio: cros_ec: Set Gyroscope default frequency to 25Hz
  ...
2020-09-13 09:15:20 -07:00
Linus Torvalds
20a7b6be05 Driver core fixes for 5.9-rc5
Here are some small driver core and debugfs fixes for 5.9-rc5
 
 Included in here are:
 	- firmware loader memory leak fix
 	- firmware loader testing fixes for non-EFI systems
 	- device link locking fixes found by lockdep
 	- kobject_del() bugfix that has been affecting some callers
 	- debugfs minor fix
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are some small driver core and debugfs fixes for 5.9-rc5

  Included in here are:

   - firmware loader memory leak fix

   - firmware loader testing fixes for non-EFI systems

   - device link locking fixes found by lockdep

   - kobject_del() bugfix that has been affecting some callers

   - debugfs minor fix

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  test_firmware: Test platform fw loading on non-EFI systems
  PM: <linux/device.h>: fix @em_pd kernel-doc warning
  kobject: Drop unneeded conditional in __kobject_del()
  driver core: Fix device_pm_lock() locking for device links
  MAINTAINERS: Add the security document to SECURITY CONTACT
  driver code: print symbolic error code
  debugfs: Fix module state check condition
  kobject: Restore old behaviour of kobject_del(NULL)
  firmware_loader: fix memory leak for paged buffer
2020-09-13 09:02:59 -07:00
Olof Johansson
a4da411e41 This pull request contains Broadcom ARM-based SoCs Device Tree fixes for
5.9, please pull the following:
 
 - Florian fixes the Broadcom QSPI controller binding such that the most
   specific compatible string is the left most one, and all existing
   in-tree users are updated as well.
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Merge tag 'arm-soc/for-5.9/devicetree-fixes' of https://github.com/Broadcom/stblinux into arm/fixes

This pull request contains Broadcom ARM-based SoCs Device Tree fixes for
5.9, please pull the following:

- Florian fixes the Broadcom QSPI controller binding such that the most
  specific compatible string is the left most one, and all existing
  in-tree users are updated as well.

* tag 'arm-soc/for-5.9/devicetree-fixes' of https://github.com/Broadcom/stblinux:
  arm64: dts: ns2: Fixed QSPI compatible string
  ARM: dts: BCM5301X: Fixed QSPI compatible string
  ARM: dts: NSP: Fixed QSPI compatible string
  ARM: dts: bcm: HR2: Fixed QSPI compatible string
  dt-bindings: spi: Fix spi-bcm-qspi compatible ordering

Link: https://lore.kernel.org/r/20200909211857.4144718-1-f.fainelli@gmail.com
Signed-off-by: Olof Johansson <olof@lixom.net>
2020-09-13 08:57:38 -07:00
Olof Johansson
2aedcb042f i.MX fixes for 5.9, round 2:
- Fix the misspelling of 'interrupts' property in i.MX8MQ TMU DT node.
 - Correct 'ahb' clock for i.MX8MP SDMA1 in device tree.
 - Fix pad QSPI1B_SCLK mux mode for UART3 on i.MX6SX.
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Merge tag 'imx-fixes-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into arm/fixes

i.MX fixes for 5.9, round 2:

- Fix the misspelling of 'interrupts' property in i.MX8MQ TMU DT node.
- Correct 'ahb' clock for i.MX8MP SDMA1 in device tree.
- Fix pad QSPI1B_SCLK mux mode for UART3 on i.MX6SX.

* tag 'imx-fixes-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  ARM: dts: imx6sx: fix the pad QSPI1B_SCLK mux mode for uart3
  arm64: dts: imx8mp: correct sdma1 clk setting
  arm64: dts: imx8mq: Fix TMU interrupt property

Link: https://lore.kernel.org/r/20200909143844.GA25109@dragon
Signed-off-by: Olof Johansson <olof@lixom.net>
2020-09-13 08:56:04 -07:00