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Subject[PATCH] Discuss a couple common errors in kernel-doc usage.

Explain a couple of the most common errors in kernel-doc usage.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>

---

seems useful to emphasize these issues since they occur occasionally
in the source.

diff --git a/Documentation/kernel-doc-nano-HOWTO.txt b/Documentation/kernel-doc-nano-HOWTO.txt
index 284e7e1..ba50129 100644
--- a/Documentation/kernel-doc-nano-HOWTO.txt
+++ b/Documentation/kernel-doc-nano-HOWTO.txt
@@ -107,10 +107,14 @@ The format of the block comment is like this:
* (section header: (section description)? )*
(*)?*/

-The short function description cannot be multiline, but the other
-descriptions can be (and they can contain blank lines). Avoid putting a
-spurious blank line after the function name, or else the description will
-be repeated!
+The short function description ***cannot be multiline***, but the other
+descriptions can be (and they can contain blank lines). If you continue
+that initial short description onto a second line, that second line will
+appear further down at the beginning of the description section, which is
+almost certainly not what you had in mind.
+
+Avoid putting a spurious blank line after the function name, or else the
+description will be repeated!

All descriptive text is further processed, scanning for the following special
patterns, which are highlighted appropriately.
@@ -121,6 +125,31 @@ patterns, which are highlighted appropriately.
'@parameter' - name of a parameter
'%CONST' - name of a constant.

+NOTE 1: The multi-line descriptive text you provide does *not* recognize
+line breaks, so if you try to format some text nicely, as in:
+
+ Return codes
+ 0 - cool
+ 1 - invalid arg
+ 2 - out of memory
+
+this will all run together and produce:
+
+ Return codes 0 - cool 1 - invalid arg 2 - out of memory
+
+NOTE 2: If the descriptive text you provide has lines that begin with
+some phrase followed by a colon, each of those phrases will be taken as
+a new section heading, which means you should similarly try to avoid text
+like:
+
+ Return codes:
+ 0: cool
+ 1: invalid arg
+ 2: out of memory
+
+every line of which would start a new section. Again, probably not
+what you were after.
+
Take a look around the source tree for examples.


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