Re: [RFC] Splitting kernel headers and deprecating __KERNEL__
From: Kyle Moffett
Date: Fri Nov 26 2004 - 22:14:11 EST
On Nov 25, 2004, at 10:13, David Howells wrote:
We've been discussing splitting the kernel headers into userspace API
headers
and kernel internal headers and deprecating the __KERNEL__ macro. This
will
permit a cleaner interface between the kernel and userspace; and one
that's
easier to keep up to date.
Yay!!! Finally!!!
NEW DIRECTORY DIRECTORY SHADOWED
============= ==================
include/user/ include/linux/
include/user-*/ include/asm-*/
How about include/abi for the platform-independent headers and
include/arch-*
for the platform-specific headers? Then include/arch would be
symlinked to the
correct arch-* directory.
Note that this doesn't take account of the other directories under
include/, but I don't think they're relevant.
Perhaps such directories should either be broken out into
abi/foo<->linux/foo
pieces, or put into their own top-level directories.
(2) Take each file from the shadowed directory. If it has any
userspace
relevant stuff, then:
[...snip...]
Something like this would warn about incorrect uses of the linux/
headers, yet
still allow for a period of backwards compatibility. Once such period
has passed,
then linux/* would not even be installed, only abi/* and arch/*
include/linux/foo.h:
#ifndef _LINUX_FOO_H
#define _LINUX_FOO_H 1
#ifndef __KERNEL__
# warning "Directly including <kernel/foo.h> is deprecated!!!"
# warning "Please change your program to include <abi/foo.h> instead!!!"
#endif
#include <abi/foo.h>
#ifdef __KERNEL__
/* Old __KERNEL__ contents of include/linux/foo.h */
#endif
#endif /* not _LINUX_FOO_H */
include/abi/foo.h:
#ifndef _ABI_FOO_H
#define_ABI_FOO_H 1
#include <abi/bar.h>
#include <arch/baz.h>
/* Old non-__KERNEL__ contents of include/linux/foo.h */
#endif /* not _ABI_FOO_H */
Cheers,
Kyle Moffett
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