Re: [RFC PATCH 0/5] kbuild: build modules from code in multiple directories.

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On Mon, Jun 18, 2018 at 02:55:20PM +1000, NeilBrown wrote:
> This set of patches makes it possible to build a module from
> code in multiple directories without needing to list files from one
> directory in the Makefile of another directory.
> 
> The code was developed for lustre (which is now out-of-tree :-( ) but
> can be useful elsewhere, such as for xfs and btrfs and others.
> 
> In fs/xfs/Makefile the section:
> 
> xfs-y				+= $(addprefix libxfs/, \
> 				   xfs_ag.o \
> 				   xfs_alloc.o \
> 				.....
> 
> could become
> 
> xfs-y += libxfs/
> 
> and then in fs/xfs/libxfs/Makefile we would have
> 
> modobj-$(CONFIG_XFS_FS) += xfs_ag.o \
> 			   xfs_alloc.o \
> 			   .....
> 
> A similar process could move filenames for scrub/* from the
> fs/xfs/Makefile to fs/xfs/scrub/Makefile

How about you actually convert it as an example?
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