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

[David Howells <dhowells@xxxxxxxxxx>]

Chen Gang <gang.chen@xxxxxxxxxxx> 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

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