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docs: ftrace-uses.rst fix varios code-block directives

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ftrace-uses.rst is not yet included into any toctree, but since it is
a .rst file, it is parsed by the Sphinx build. Thats, why we see some
WARNINGS:

- trace/ftrace-uses.rst:53: WARNING: Definition list ends without a blank line; unexpected unindent.
- trace/ftrace-uses.rst:89: WARNING: Inline emphasis start-string without end-string.
- trace/ftrace-uses.rst:89: WARNING: Inline emphasis start-string without end-strin

Fixing the code-block directives results in a less noisy build, but the 'not
included' WARNING will be stay:

- trace/ftrace-uses.rst: WARNING: document isn't included in any toctree

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Markus Heiser 2017-12-12 11:22:25 +01:00 committed by Jonathan Corbet
parent 27e7c0e813
commit 2cd6ff4ac0
1 changed files with 30 additions and 30 deletions
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60
Documentation/trace/ftrace-uses.rst
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@ -42,9 +42,9 @@ as well as what protections the callback will perform and not require
ftrace to handle.
There is only one field that is needed to be set when registering
an ftrace_ops with ftrace::
an ftrace_ops with ftrace:
.. code-block: c
.. code-block:: c
struct ftrace_ops ops = {
.func = my_callback_func,
@ -81,12 +81,12 @@ may take some time to finish.
The callback function
=====================
The prototype of the callback function is as follows (as of v4.14)::
The prototype of the callback function is as follows (as of v4.14):
.. code-block: c
.. code-block:: c
void callback_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs);
void callback_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs);
@ip
This is the instruction pointer of the function that is being traced.
@ -176,10 +176,10 @@ Filtering which functions to trace
If a callback is only to be called from specific functions, a filter must be
set up. The filters are added by name, or ip if it is known.
.. code-block: c
.. code-block:: c
int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
int len, int reset);
int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
int len, int reset);
@ops
The ops to set the filter with
@ -202,9 +202,9 @@ See Filter Commands in :file:`Documentation/trace/ftrace.txt`.
To just trace the schedule function::
.. code-block: c
.. code-block:: c
ret = ftrace_set_filter(&ops, "schedule", strlen("schedule"), 0);
ret = ftrace_set_filter(&ops, "schedule", strlen("schedule"), 0);
To add more functions, call the ftrace_set_filter() more than once with the
@reset parameter set to zero. To remove the current filter set and replace it
@ -212,17 +212,17 @@ with new functions defined by @buf, have @reset be non-zero.
To remove all the filtered functions and trace all functions::
.. code-block: c
.. code-block:: c
ret = ftrace_set_filter(&ops, NULL, 0, 1);
ret = ftrace_set_filter(&ops, NULL, 0, 1);
Sometimes more than one function has the same name. To trace just a specific
function in this case, ftrace_set_filter_ip() can be used.
.. code-block: c
.. code-block:: c
ret = ftrace_set_filter_ip(&ops, ip, 0, 0);
ret = ftrace_set_filter_ip(&ops, ip, 0, 0);
Although the ip must be the address where the call to fentry or mcount is
located in the function. This function is used by perf and kprobes that
@ -237,10 +237,10 @@ be called by any function.
An empty "notrace" list means to allow all functions defined by the filter
to be traced.
.. code-block: c
.. code-block:: c
int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
int len, int reset);
int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
int len, int reset);
This takes the same parameters as ftrace_set_filter() but will add the
functions it finds to not be traced. This is a separate list from the
@ -251,7 +251,7 @@ that match @buf to it.
Clearing the "notrace" list is the same as clearing the filter list
.. code-block: c
.. code-block:: c
ret = ftrace_set_notrace(&ops, NULL, 0, 1);
@ -264,29 +264,29 @@ If a filter is in place, and the @reset is non-zero, and @buf contains a
matching glob to functions, the switch will happen during the time of
the ftrace_set_filter() call. At no time will all functions call the callback.
.. code-block: c
.. code-block:: c
ftrace_set_filter(&ops, "schedule", strlen("schedule"), 1);
ftrace_set_filter(&ops, "schedule", strlen("schedule"), 1);
register_ftrace_function(&ops);
register_ftrace_function(&ops);
msleep(10);
msleep(10);
ftrace_set_filter(&ops, "try_to_wake_up", strlen("try_to_wake_up"), 1);
ftrace_set_filter(&ops, "try_to_wake_up", strlen("try_to_wake_up"), 1);
is not the same as:
.. code-block: c
.. code-block:: c
ftrace_set_filter(&ops, "schedule", strlen("schedule"), 1);
ftrace_set_filter(&ops, "schedule", strlen("schedule"), 1);
register_ftrace_function(&ops);
register_ftrace_function(&ops);
msleep(10);
msleep(10);
ftrace_set_filter(&ops, NULL, 0, 1);
ftrace_set_filter(&ops, NULL, 0, 1);
ftrace_set_filter(&ops, "try_to_wake_up", strlen("try_to_wake_up"), 0);
ftrace_set_filter(&ops, "try_to_wake_up", strlen("try_to_wake_up"), 0);
As the latter will have a short time where all functions will call
the callback, between the time of the reset, and the time of the