path: root/Documentation/process/deprecated.rst
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authorJoe Perches <joe@perches.com>2019-10-05 09:46:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-11 09:26:05 -0700
commit294f69e662d1570703e9b56e95be37a9fd3afba5 (patch)
tree8138e829d29b3f06e3bc1de49cab4a34e31dc1a7 /Documentation/process/deprecated.rst
parent48f9bcf91461b43249949f4e172b5c0245dde751 (diff)
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@perches.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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