linux-kernel - Re: Byteorder conditional compilation problems

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Message-ID: <CA+55aFw5aqVCpsSAyy5VFhk4UwgBxKpOikVz-AC3kLJsxe0Ygw@mail.gmail.com>
Date:	Wed, 6 Mar 2013 09:37:35 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Joakim.Tjernlund@...nsmode.se,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Byteorder conditional compilation problems

On Wed, Mar 6, 2013 at 8:43 AM, David Howells <dhowells@...hat.com> wrote:
>
> Scripting a change from "defined(__XXX_ENDIAN)" to "(__XXX_ENDIAN==__BYTEORDER)"
> should be easy to script.

How about we just make the rule be that we shouldn't test __xyz_ENDIAN
at all, and instead always use CONFIG_xyz_ENDIAN, which isn't
ambiguous. And then have the exporter of the uapi header files just
sed-script that into __xyz_ENDIAN == __BYTEORDER.

The whole __xyz_ENDIAN == __BYTE_ORDER syntax is moronic, and the
standard under BSD seems to be single-underscore "_BYTE_ORDER", while
glibc uses double underscore __BYTE_ORDER. The whole thing is a
f*cking mess, and I really don't want to get the idiotic mess into the
kernel any more than I have to.

In fact, I'd prefer to let it just be. Changing it in the kernel to
the idiotic and non-standard user mode format is pointless. Just fix
up the (few) entries in the uapi header files.

                  Linus
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