Re: buffer cache

[David Woodhouse <dwmw2@infradead.org>]

Please don't drop me from the recipients when replying; it's very rude.

On Sun, 2003-09-14 at 12:03 +0200, Jan Hudec wrote:
> > Probably as a result of hacking up his own broken makefiles instead of 
> > 	make -C $KERNELDIR SUBDIRS=`pwd` modules
> 
> Well, I wrote a module to compile off-tree. The correct command to link
> a module is:
> ld -r -o <modname>.o <objects...>

No, that's not always correct. It's completely wrong for 2.6, of course
-- and even for 2.4, if building modules for a 64-bit kernel, you may
find your userspace is 32-bit by default and you need something like
-melf64_sparc on the linker command line. The kernel makefiles get this
right. Use them.

The kernel is also free to screw with its own internal ABI all it likes
-- with cflags affecting global register usage, etc. You must do as it
does in the kernel you happen to be building -- which basically means
you must use the kernel build system.

The correct way to build modules out of the kernel tree is to use the
kernel makefiles and override SUBDIRS to point at your own directory;
it's been that way since 2.0 if not earlier.

-- 
dwmw2