jump_label: Add comment about initialization order for anonymous unions
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Thu, 2 Mar 2017 22:28:45 +0000 (17:28 -0500)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Fri, 3 Mar 2017 14:45:00 +0000 (09:45 -0500)
commitb17ef2ed624aa7c1f68ed11acd16ecbf80fe01d7
treebcad6c5b7af4f880d1f52370cfa84632ba94cef9
parentcd8d860dcce906cd477be7d0648ba6f56a52eaa6
jump_label: Add comment about initialization order for anonymous unions

Commit 3821fd35b58d ("jump_label: Reduce the size of struct static_key")
broke old compilers that could not handle static initialization of anonymous
unions. Boris fixed it with a patch that added brackets around the static
initializer. But this creates a dependency between those initializers and
the structure's order of its fields. Document this dependency in case new
fields are added to struct static_key in the future.

Noted-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Suggested-by: Chris Mason <clm@fb.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
include/linux/jump_label.h