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linux/drivers/md/dm-vdo/Makefile
Masahiro Yamada b1992c3772 kbuild: use $(src) instead of $(srctree)/$(src) for source directory
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:

    src := $(obj)

When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.

This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.

To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.

Going forward, the variables used in Makefiles will have the following
meanings:

  $(obj)     - directory in the object tree
  $(src)     - directory in the source tree  (changed by this commit)
  $(objtree) - the top of the kernel object tree
  $(srctree) - the top of the kernel source tree

Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2024-05-10 04:34:52 +09:00

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1.0 KiB
Makefile

# SPDX-License-Identifier: GPL-2.0-only
ccflags-y := -I$(src) -I$(src)/indexer
obj-$(CONFIG_DM_VDO) += dm-vdo.o
dm-vdo-objs := \
action-manager.o \
admin-state.o \
block-map.o \
completion.o \
data-vio.o \
dedupe.o \
dm-vdo-target.o \
dump.o \
encodings.o \
errors.o \
flush.o \
funnel-queue.o \
funnel-workqueue.o \
int-map.o \
io-submitter.o \
logger.o \
logical-zone.o \
memory-alloc.o \
message-stats.o \
murmurhash3.o \
packer.o \
permassert.o \
physical-zone.o \
priority-table.o \
recovery-journal.o \
repair.o \
slab-depot.o \
status-codes.o \
string-utils.o \
thread-device.o \
thread-registry.o \
thread-utils.o \
vdo.o \
vio.o \
wait-queue.o \
indexer/chapter-index.o \
indexer/config.o \
indexer/delta-index.o \
indexer/funnel-requestqueue.o \
indexer/geometry.o \
indexer/index.o \
indexer/index-layout.o \
indexer/index-page-map.o \
indexer/index-session.o \
indexer/io-factory.o \
indexer/open-chapter.o \
indexer/radix-sort.o \
indexer/sparse-cache.o \
indexer/volume.o \
indexer/volume-index.o