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Diffstat (limited to 'Documentation/dev-tools/checkpatch.rst')
| -rw-r--r-- | Documentation/dev-tools/checkpatch.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/dev-tools/checkpatch.rst b/Documentation/dev-tools/checkpatch.rst index b7a1288e96a9..891779c7f0bf 100644 --- a/Documentation/dev-tools/checkpatch.rst +++ b/Documentation/dev-tools/checkpatch.rst @@ -851,6 +851,27 @@ Macros, Attributes and Symbols Use the `fallthrough;` pseudo keyword instead of `/* fallthrough */` like comments. + **TRAILING_SEMICOLON** + Macro definition should not end with a semicolon. The macro + invocation style should be consistent with function calls. + This can prevent any unexpected code paths:: + + #define MAC do_something; + + If this macro is used within a if else statement, like:: + + if (some_condition) + MAC; + + else + do_something; + + Then there would be a compilation error, because when the macro is + expanded there are two trailing semicolons, so the else branch gets + orphaned. + + See: https://lore.kernel.org/lkml/1399671106.2912.21.camel@joe-AO725/ + **WEAK_DECLARATION** Using weak declarations like __attribute__((weak)) or __weak can have unintended link defects. Avoid using them. |