The majority of this patch was created by the following script:

***
ASM=arch/sparc/include/asm
mkdir -p $ASM
git mv include/asm-sparc64/ftrace.h $ASM
git rm include/asm-sparc64/*
git mv include/asm-sparc/* $ASM
sed -ie 's/asm-sparc64/asm/g' $ASM/*
sed -ie 's/asm-sparc/asm/g' $ASM/*
***

The rest was an update of the top-level Makefile to use sparc
for header files when sparc64 is being build.
And a small fixlet to pick up the correct unistd.h from
sparc64 code.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Padding from 32 bit sparc kept using preprocessor magic

:$ diff -u include/asm-sparc/msgbuf.h include/asm-sparc64/msgbuf.h
:-- include/asm-sparc/msgbuf.h	2008-06-13 06:42:07.000000000 +0200
:++ include/asm-sparc64/msgbuf.h	2008-06-13 06:42:07.000000000 +0200
:@@ -7,17 +7,13 @@
:  * between kernel and user space.
:  *
:  * Pad space is left for:
:- * - 64-bit time_t to solve y2038 problem
:- * - 2 miscellaneous 32-bit values
:+ * - 2 miscellaneous 64-bit values
:  */
:
: struct msqid64_ds {
: 	struct ipc64_perm msg_perm;
:-	unsigned int   __pad1;
: 	__kernel_time_t msg_stime;	/* last msgsnd time */
:-	unsigned int   __pad2;
: 	__kernel_time_t msg_rtime;	/* last msgrcv time */
:-	unsigned int   __pad3;
: 	__kernel_time_t msg_ctime;	/* last change time */
: 	unsigned long  msg_cbytes;	/* current number of bytes on queue */
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!