> On Mon, 2024-04-01 at 14:21 +1300, Barry Song wrote:
> > From: Xining Xu <mac.xxn@xxxxxxxxxxx>
> >
> > If function-like macros do not utilize a parameter, it might result in a
> > build warning. In our coding style guidelines, we advocate for utilizing
> > static inline functions to replace such macros. This patch verifies
> > compliance with the new rule.
> >
> > For a macro such as the one below,
> >
> > #define test(a) do { } while (0)
> >
> > The test result is as follows.
> >
> > ERROR: Parameter 'a' is not used in function-like macro, please use static
> > inline instead
> > #21: FILE: mm/init-mm.c:20:
> > +#define test(a) do { } while (0)
>
> This is no longer true.
> Please update the ERROR->WARN and message as below
>
> Ideally, this would have an update to
> Documentation/dev-tools/checkpatch.rst
>
> to describe the new --verbose message type
Hi Joe,
Thank you for the comments, here's the code:
+# check if this is an unused argument
+if ($define_stmt !~ /\b$arg\b/) {
+ WARN("MACRO_ARG_UNUSED",
+ "Argument '$arg' is not used in function-like macro\n" . "$herectx");
+}
and here's the document for it which is inserted into the "Macros, Attributes and
Symbols" section of checkpatch.rst starting from line 909:
+
+ **MACRO_ARG_UNUSED**
+ If function-like macros do not utilize a parameter, it might result
+ in a build warning. We advocate for utilizing static inline functions
+ to replace such macros.
+ For example, for a macro as below::
+
+ #define test(a) do { } while (0)
+
+ there would be a warning as below::
+
+ WARNING: Parameter 'a' is not used in function-like macro, please use
+ static inline instead.
Please let me know if the document needs further re-wording to make it helpful enough
to the readers.
Thanks,
Xining
