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| -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. |