Re: [alsa-devel] [PATCH trivial] include: uapi: standard all files' macro prefix and suffix, excluding "linux/" sub-directory

Chen Gang gang.chen@asianux.com wrote:

...

Userspace sometimes depends on the name in the guard macro:-/

"the guard macro" is only for prevent itself from being included by multiple times (an id used by itself -- like a handle), it is not an id to let other files know about it (it is not a normal using way).

Whilst that *should* be true, it isn't actually true. See:

grep -r _LINUX_.*_H /usr/include/ | grep -v ^/usr/include/linux/

for example. Also who knows what all those autoconf scripts out there look for?

However, thinking about it some more, you're probably safe with respect to userspace as scripts/headers_install.h strips off the _UAPI prefix on the guard macros - just as long as you don't change the rest of the macro name.

David