]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - Kbuild
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-zesty-kernel.git] / Kbuild
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1#
2# Kbuild for top-level directory of the kernel
3# This file takes care of the following:
1cdf25d7 4# 1) Generate bounds.h
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5# 2) Generate timeconst.h
6# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
7# 4) Check for missing system calls
f197d75f 8# 5) Generate constants.py (may need bounds.h)
86feeaa8 9
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10# Default sed regexp - multiline due to syntax constraints
11define sed-y
12 "/^->/{s:->#\(.*\):/* \1 */:; \
13 s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
14 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
15 s:->::; p;}"
16endef
1cdf25d7 17
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18# Use filechk to avoid rebuilds when a header changes, but the resulting file
19# does not
20define filechk_offsets
1cdf25d7 21 (set -e; \
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22 echo "#ifndef $2"; \
23 echo "#define $2"; \
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24 echo "/*"; \
25 echo " * DO NOT MODIFY."; \
26 echo " *"; \
27 echo " * This file was generated by Kbuild"; \
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28 echo " */"; \
29 echo ""; \
70a4fd6c 30 sed -ne $(sed-y); \
1cdf25d7 31 echo ""; \
70a4fd6c 32 echo "#endif" )
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33endef
34
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35#####
36# 1) Generate bounds.h
37
38bounds-file := include/generated/bounds.h
39
40always := $(bounds-file)
8a58e162 41targets := kernel/bounds.s
39664e2f 42
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43# We use internal kbuild rules to avoid the "is up to date" message from make
44kernel/bounds.s: kernel/bounds.c FORCE
45 $(Q)mkdir -p $(dir $@)
46 $(call if_changed_dep,cc_s_c)
47
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48$(obj)/$(bounds-file): kernel/bounds.s FORCE
49 $(call filechk,offsets,__LINUX_BOUNDS_H__)
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50
51#####
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52# 2) Generate timeconst.h
53
54timeconst-file := include/generated/timeconst.h
55
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56targets += $(timeconst-file)
57
58quiet_cmd_gentimeconst = GEN $@
59define cmd_gentimeconst
60 (echo $(CONFIG_HZ) | bc -q $< ) > $@
61endef
62define filechk_gentimeconst
63 (echo $(CONFIG_HZ) | bc -q $< )
64endef
65
66$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
67 $(call filechk,gentimeconst)
68
69#####
70# 3) Generate asm-offsets.h
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71#
72
559df2e0 73offsets-file := include/generated/asm-offsets.h
86feeaa8 74
1cdf25d7 75always += $(offsets-file)
6752ed90 76targets += arch/$(SRCARCH)/kernel/asm-offsets.s
1cdf25d7 77
86feeaa8 78# We use internal kbuild rules to avoid the "is up to date" message from make
1cdf25d7 79arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
0a227985 80 $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
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81 $(Q)mkdir -p $(dir $@)
82 $(call if_changed_dep,cc_s_c)
83
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84$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
85 $(call filechk,offsets,__ASM_OFFSETS_H__)
86feeaa8 86
c53aeca0 87#####
0a227985 88# 4) Check for missing system calls
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89#
90
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91always += missing-syscalls
92targets += missing-syscalls
93
c53aeca0 94quiet_cmd_syscalls = CALL $<
44656fa0 95 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
c53aeca0 96
5f7efb4c 97missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
c53aeca0 98 $(call cmd,syscalls)
1cdf25d7 99
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100#####
101# 5) Generate constants for Python GDB integration
102#
103
104extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
105
106build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
107 @$(MAKE) $(build)=scripts/gdb/linux $@
108
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109# Keep these three files during make clean
110no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)