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| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2015-04-16 12:43:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 09:03:54 -0400 |
| commit | f2027543b9cb47e1853d8c34fe931e2fcee5cb65 (patch) | |
| tree | 75f849fec3effd981186b501974ea7367d346f0d /Documentation/CodingStyle | |
| parent | 95d119528b0b8440a63bc13904e9873fc3a70503 (diff) | |
| download | lwn-f2027543b9cb47e1853d8c34fe931e2fcee5cb65.tar.gz lwn-f2027543b9cb47e1853d8c34fe931e2fcee5cb65.zip | |
documentation: update CodingStyle on local variables naming in macros
Describe proper naming convention for local variables in macros
resembling functions.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/CodingStyle')
| -rw-r--r-- | Documentation/CodingStyle | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/CodingStyle b/Documentation/CodingStyle index 449a8a19fc21..4d4f06d47e06 100644 --- a/Documentation/CodingStyle +++ b/Documentation/CodingStyle @@ -659,6 +659,19 @@ macros using parameters. #define CONSTANT 0x4000 #define CONSTEXP (CONSTANT | 3) +5) namespace collisions when defining local variables in macros resembling +functions: + +#define FOO(x) \ +({ \ + typeof(x) ret; \ + ret = calc_ret(x); \ + (ret); \ +)} + +ret is a common name for a local variable - __foo_ret is less likely +to collide with an existing variable. + The cpp manual deals with macros exhaustively. The gcc internals manual also covers RTL which is used frequently with assembly language in the kernel. |