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Subject[PATCH 3/3] firmware: rewrite Makefile
Date
Clean up the Makefile. Equivalent *.gen.S files are produced.

- Use filechk to remove ugly wordsize_deps

- Get FWNAME, FWSTR, ASM_WORD, ASM_ALIGN, and PROGBITS out of the
recipe for readability

- Move mkdir into the recipe

- Clean up generated directories by 'make clean'

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

For this patch to work correctly,
the following prerequisite is necessary:

https://patchwork.kernel.org/patch/10707461/

So, I will queue this series to kbuild tree.

BTW, my next plan is to move firmware/ to
more relevant place, for example,
drivers/base/firmware_loader/builtin.


firmware/Makefile | 89 ++++++++++++++++++++++---------------------------------
1 file changed, 35 insertions(+), 54 deletions(-)

diff --git a/firmware/Makefile b/firmware/Makefile
index 2964138..18d1c84 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -1,61 +1,42 @@
# SPDX-License-Identifier: GPL-2.0
-#
-# kbuild file for firmware/
-#

-# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
+# Create $(fwdir) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
# leading /, it's relative to $(srctree).
fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR))
-fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
-
-fw-external-y := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE))
-
-quiet_cmd_fwbin = MK_FW $@
- cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
- FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
- firmware/%.gen.S,%,$@))))"; \
- ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
- ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
- PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
- echo "/* Generated by firmware/Makefile */" > $@;\
- echo " .section .rodata" >>$@;\
- echo " .p2align $${ASM_ALIGN}" >>$@;\
- echo "_fw_$${FWSTR}_bin:" >>$@;\
- echo " .incbin \"$(2)\"" >>$@;\
- echo "_fw_end:" >>$@;\
- echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
- echo " .p2align $${ASM_ALIGN}" >>$@;\
- echo "_fw_$${FWSTR}_name:" >>$@;\
- echo " .string \"$$FWNAME\"" >>$@;\
- echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\
- echo " .p2align $${ASM_ALIGN}" >>$@;\
- echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\
- echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\
- echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@;
-
-# One of these files will change, or come into existence, whenever
-# the configuration changes between 32-bit and 64-bit. The .S files
-# need to change when that happens.
-wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
- include/config/ppc32.h include/config/ppc64.h \
- include/config/superh32.h include/config/superh64.h \
- include/config/x86_32.h include/config/x86_64.h \
- firmware/Makefile)
-
-$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
- include/config/extra/firmware/dir.h
- $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
+fwdir := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
+
+obj-y := $(addsuffix .gen.o, $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE)))
+
+FWNAME = $(patsubst $(obj)/%.gen.S,%,$@)
+FWSTR = $(subst /,_,$(subst .,_,$(subst -,_,$(FWNAME))))
+ASM_WORD = $(if $(CONFIG_64BIT),.quad,.long)
+ASM_ALIGN = $(if $(CONFIG_64BIT),3,2)
+PROGBITS = $(if $(CONFIG_ARM),%,@)progbits
+
+filechk_fwbin = { \
+ echo "/* Generated by $(src)/Makefile */" ;\
+ echo " .section .rodata" ;\
+ echo " .p2align $(ASM_ALIGN)" ;\
+ echo "_fw_$(FWSTR)_bin:" ;\
+ echo " .incbin \"$(fwdir)/$(FWNAME)\"" ;\
+ echo "_fw_end:" ;\
+ echo " .section .rodata.str,\"aMS\",$(PROGBITS),1" ;\
+ echo " .p2align $(ASM_ALIGN)" ;\
+ echo "_fw_$(FWSTR)_name:" ;\
+ echo " .string \"$(FWNAME)\"" ;\
+ echo " .section .builtin_fw,\"a\",$(PROGBITS)" ;\
+ echo " .p2align $(ASM_ALIGN)" ;\
+ echo " $(ASM_WORD) _fw_$(FWSTR)_name" ;\
+ echo " $(ASM_WORD) _fw_$(FWSTR)_bin" ;\
+ echo " $(ASM_WORD) _fw_end - _fw_$(FWSTR)_bin" ;\
+}
+
+$(obj)/%.gen.S: FORCE
+ @mkdir -p $(dir $@)
+ $(call filechk,fwbin)

# The .o files depend on the binaries directly; the .S files don't.
-$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
-
-obj-y += $(patsubst %,%.gen.o, $(fw-external-y))
-
-ifeq ($(KBUILD_SRC),)
-# Makefile.build only creates subdirectories for O= builds, but external
-# firmware might live outside the kernel source tree
-_dummy := $(foreach d,$(addprefix $(obj)/,$(dir $(fw-external-y))), $(shell [ -d $(d) ] || mkdir -p $(d)))
-endif
+$(addprefix $(obj)/, $(obj-y)): $(obj)/%.gen.o: $(fwdir)/%

-targets := $(patsubst $(obj)/%,%, \
- $(shell find $(obj) -name \*.gen.S 2>/dev/null))
+targets := $(shell cd $(obj) && find * -name '*.gen.S')
+clean-dirs := $(shell cd $(obj) && find * -maxdepth 0 -type d)
--
2.7.4
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