From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
This section is mentioned in scripts/kernel-doc, so we should mention it
in doc-guide/kernel-doc.rst. There are close to 500 comments using the
Context section already, and almost 300 using a Locking section which
fulfills much the same purpose (and should probably be converted for
consistency).
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
---
Documentation/doc-guide/kernel-doc.rst | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/Documentation/doc-guide/kernel-doc.rst b/Documentation/doc-guide/kernel-doc.rst
index 722d4525f7cf..315b0ecc7a11 100644
--- a/Documentation/doc-guide/kernel-doc.rst
+++ b/Documentation/doc-guide/kernel-doc.rst
@@ -117,6 +117,7 @@ Example kernel-doc function comment::
*
* Longer description of foobar.
*
+ * Context: Interrupt / locking context of foobar.
* Return: Description of return value of foobar.
*/
int foobar(int argument1, char *argument2)
@@ -216,6 +217,9 @@ The general format of a function and function-like macro kernel-doc comment is::
*
* The longer description may have multiple paragraphs.
*
+ * Context: Describes whether the function can sleep, what locks it takes,
+ * releases, or expects to be held. It can extend over multiple
+ * lines.
* Return: Describe the return value of foobar.
*
* The return value description can also have multiple paragraphs, and should
@@ -226,6 +230,24 @@ The brief description following the function name may span multiple lines, and
ends with an argument description, a blank comment line, or the end of the
comment block.
+Function context
+~~~~~~~~~~~~~~~~
+
+The context in which a function can be called should be described in a
+section named ``Context``. This should include whether the function
+sleeps or can be called from interrupt context, as well as what locks
+it takes, releases and expects to be held by its caller.
+
+Examples::
+
+ * Context: Any context.
+ * Context: Any context. Takes and releases the RCU lock.
+ * Context: Any context. Expects <lock> to be held by caller.
+ * Context: Process context. May sleep if @gfp flags permit.
+ * Context: Process context. Takes and releases <mutex>.
+ * Context: Softirq or process context. Takes and releases <lock>, BH-safe.
+ * Context: Interrupt context.
+
Return values
~~~~~~~~~~~~~
@@ -347,6 +369,9 @@ Typedefs with function prototypes can also be documented::
* @arg2: description of arg2
*
* Description of the type.
+ *
+ * Context: Locking context.
+ * Return: Meaning of the return value.
*/
typedef void (*type_name)(struct v4l2_ctrl *arg1, void *arg2);
--
2.15.1
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
