Linux/linux 294f69einclude/linux compiler_attributes.h

compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use

Reserve the pseudo keyword 'fallthrough' for the ability to convert the
various case block /* fallthrough */ style comments to appear to be an
actual reserved word with the same gcc case block missing fallthrough
warning capability.

All switch/case blocks now should end in one of:

        break;
        fallthrough;
        goto <label>;
        return [expression];
        continue;

In C mode, GCC supports the __fallthrough__ attribute since 7.1,
the same time the warning and the comment parsing were introduced.

fallthrough devolves to an empty "do {} while (0)" if the compiler
version (any version less than gcc 7) does not support the attribute.

Signed-off-by: Joe Perches <joe at perches.com>
Acked-by: Peter Zijlstra (Intel) <peterz at infradead.org>
Suggested-by: Dan Carpenter <dan.carpenter at oracle.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis at gmail.com>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
DeltaFile
+17-0include/linux/compiler_attributes.h
+17-01 files

UnifiedSplitRaw