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Subject[PATCH v2] kbuild: Consolidate header generation from ASM offset information
Date
Largely redundant code is used in different places to generate C headers
from offset information extracted from assembly language output.
Consolidate the code in Makefile.lib and use this instead.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v2:
- Move common stuff to Makefile.lib instead of adding a new include
- Make entire filechk_offsets macro common
- Remove wrapper from ia64 and mod Makefiles and call filechk_offsets
directly

Kbuild | 25 -------------------------
arch/ia64/kernel/Makefile | 26 ++------------------------
scripts/Makefile.lib | 28 ++++++++++++++++++++++++++++
scripts/mod/Makefile | 28 ++--------------------------
4 files changed, 32 insertions(+), 75 deletions(-)

diff --git a/Kbuild b/Kbuild
index 3d0ae152af7c..94c752762bc2 100644
--- a/Kbuild
+++ b/Kbuild
@@ -7,31 +7,6 @@
# 4) Check for missing system calls
# 5) Generate constants.py (may need bounds.h)

-# Default sed regexp - multiline due to syntax constraints
-define sed-y
- "/^->/{s:->#\(.*\):/* \1 */:; \
- s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
- s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
- s:->::; p;}"
-endef
-
-# Use filechk to avoid rebuilds when a header changes, but the resulting file
-# does not
-define filechk_offsets
- (set -e; \
- echo "#ifndef $2"; \
- echo "#define $2"; \
- echo "/*"; \
- echo " * DO NOT MODIFY."; \
- echo " *"; \
- echo " * This file was generated by Kbuild"; \
- echo " */"; \
- echo ""; \
- sed -ne $(sed-y); \
- echo ""; \
- echo "#endif" )
-endef
-
#####
# 1) Generate bounds.h

diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 3686d6abafde..9edda5466020 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -50,32 +50,10 @@ CFLAGS_traps.o += -mfixed-range=f2-f5,f16-f31
# The gate DSO image is built using a special linker script.
include $(src)/Makefile.gate

-# Calculate NR_IRQ = max(IA64_NATIVE_NR_IRQS, XEN_NR_IRQS, ...) based on config
-define sed-y
- "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
-endef
-quiet_cmd_nr_irqs = GEN $@
-define cmd_nr_irqs
- (set -e; \
- echo "#ifndef __ASM_NR_IRQS_H__"; \
- echo "#define __ASM_NR_IRQS_H__"; \
- echo "/*"; \
- echo " * DO NOT MODIFY."; \
- echo " *"; \
- echo " * This file was generated by Kbuild"; \
- echo " *"; \
- echo " */"; \
- echo ""; \
- sed -ne $(sed-y) $<; \
- echo ""; \
- echo "#endif" ) > $@
-endef
-
# We use internal kbuild rules to avoid the "is up to date" message from make
arch/$(SRCARCH)/kernel/nr-irqs.s: arch/$(SRCARCH)/kernel/nr-irqs.c
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)

-include/generated/nr-irqs.h: arch/$(SRCARCH)/kernel/nr-irqs.s
- $(Q)mkdir -p $(dir $@)
- $(call cmd,nr_irqs)
+include/generated/nr-irqs.h: arch/$(SRCARCH)/kernel/nr-irqs.s FORCE
+ $(call filechk,offsets,__ASM_NR_IRQS_H__)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 0a07f9014944..dd567e5d59e0 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -408,3 +408,31 @@ quiet_cmd_xzmisc = XZMISC $@
cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
(rm -f $@ ; false)
+
+# ASM offsets
+# ---------------------------------------------------------------------------
+
+# Default sed regexp - multiline due to syntax constraints
+define sed-offsets
+ "/^->/{s:->#\(.*\):/* \1 */:; \
+ s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
+ s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
+ s:->::; p;}"
+endef
+
+# Use filechk to avoid rebuilds when a header changes, but the resulting file
+# does not
+define filechk_offsets
+ (set -e; \
+ echo "#ifndef $2"; \
+ echo "#define $2"; \
+ echo "/*"; \
+ echo " * DO NOT MODIFY."; \
+ echo " *"; \
+ echo " * This file was generated by Kbuild"; \
+ echo " */"; \
+ echo ""; \
+ sed -ne $(sed-offsets); \
+ echo ""; \
+ echo "#endif" )
+endef
diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
index 19d9bcadc0cc..b497d9764dcf 100644
--- a/scripts/mod/Makefile
+++ b/scripts/mod/Makefile
@@ -7,32 +7,8 @@ modpost-objs := modpost.o file2alias.o sumversion.o

devicetable-offsets-file := devicetable-offsets.h

-define sed-y
- "/^->/{s:->#\(.*\):/* \1 */:; \
- s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
- s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
- s:->::; p;}"
-endef
-
-quiet_cmd_offsets = GEN $@
-define cmd_offsets
- (set -e; \
- echo "#ifndef __DEVICETABLE_OFFSETS_H__"; \
- echo "#define __DEVICETABLE_OFFSETS_H__"; \
- echo "/*"; \
- echo " * DO NOT MODIFY."; \
- echo " *"; \
- echo " * This file was generated by Kbuild"; \
- echo " *"; \
- echo " */"; \
- echo ""; \
- sed -ne $(sed-y) $<; \
- echo ""; \
- echo "#endif" ) > $@
-endef
-
-$(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s
- $(call if_changed,offsets)
+$(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s FORCE
+ $(call filechk,offsets,__DEVICETABLE_OFFSETS_H__)

targets += $(devicetable-offsets-file) devicetable-offsets.s

--
2.12.2.715.g7642488e1d-goog
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