Re: 2.6-test4: mpspec.h:6:25: mach_mpspec.h: Missing file

[Matthew Wilcox <willy@debian.org>]

On Thu, Sep 04, 2003 at 03:19:27PM -0700, John Donnelly wrote:
> I'm trying to build a (add-on) module 
> on a machine booted from a 2.6-test4 kernel,
> And keep running into this error. I've 
> included the  gcc command line, sample
> and the fatal error that mach_mpspec.h can't be found.

I think you'd be much better off integrating your code into the tree as
a drivers/scsi/ subdirectory; see how little Makefile code has to be
written for (eg) sym53c8xx_2/

> My general question is, should I include the 
> 
> -I/work/src/<build>/include/asm-i386/mach-generic/mach_mpspec.h
> 
> in my gcc command line or is my build area incorrect
> is
> some way that the correct mpspec.h file can't be found ?

There are many bits of the 2.6 build system that work differently from 2.4,
see below..

> In file included from /work/src/linux-2.6.0-test4/include/asm/smp.h:18,
>                  from /work/src/linux-2.6.0-test4/include/linux/smp.h:17,
>                  from /work/src/linux-2.6.0-test4/include/linux/topology.h:33,
>                  from /work/src/linux-2.6.0-test4/include/linux/mmzone.h:294,
>                  from /work/src/linux-2.6.0-test4/include/linux/gfp.h:4,
>                  from /work/src/linux-2.6.0-test4/include/linux/slab.h:15,
>                  from test.c:8:
> /work/src/linux-2.6.0-test4/include/asm/mpspec.h:6:25: mach_mpspec.h: No such file or directory
> /work/src/linux-2.6.0-test4/include/asm/mpspec.h:8: `MAX_MP_BUSSES' undeclared here (not in a function)
> 
>  gcc -g -D__KERNEL__ -DMODULE -I/work/src/linux-2.6.0-test4/include \
> 	-I/work/src/linux-2.6.0-test4/drivers/scsi -c test.c

Here's the command line for a normal file (as compiled on my laptop,
your tree will no doubt use subtly diffeent options.  Use `make V=1'
to see the verbose output from make)

  gcc -Wp,-MD,mm/.fadvise.o.d -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=k6 -Iinclude/asm-i386/mach-default -D__KERNEL__ -Iinclude -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=k6 -Iinclude/asm-i386/mach-default -fomit-frame-pointer -nostdinc -iwithprefix include    -DKBUILD_BASENAME=fadvise -DKBUILD_MODNAME=fadvise -c -o mm/fadvise.o mm/fadvise.c

For building outside the tree, I guess you wouldn't need some of it, but
I think your problem is caused by missing -Iinclude/asm-i386/mach-default

But build inside the tree.  You're going to want to do that eventually
anyway and it saves you from this problem and several like it.

-- 
"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk