drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / scripts / Makefile.modpost
1 # ===========================================================================
2 # Module versions
3 # ===========================================================================
4 #
5 # Stage one of module building created the following:
6 # a) The individual .o files used for the module
7 # b) A <module>.o file which is the .o files above linked together
8 # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
9 # the preliminary <module>.o file, plus all .o files
10
11 # Stage 2 is handled by this file and does the following
12 # 1) Find all modules from the files listed in $(MODVERDIR)/
13 # 2) modpost is then used to
14 # 3) create one <module>.mod.c file pr. module
15 # 4) create one Module.symvers file with CRC for all exported symbols
16 # 5) compile all <module>.mod.c files
17 # 6) final link of the module to a <module.ko> file
18
19 # Step 3 is used to place certain information in the module's ELF
20 # section, including information such as:
21 # Version magic (see include/linux/vermagic.h for full details)
22 # - Kernel release
23 # - SMP is CONFIG_SMP
24 # - PREEMPT is CONFIG_PREEMPT
25 # - GCC Version
26 # Module info
27 # - Module version (MODULE_VERSION)
28 # - Module alias'es (MODULE_ALIAS)
29 # - Module license (MODULE_LICENSE)
30 # - See include/linux/module.h for more details
31
32 # Step 4 is solely used to allow module versioning in external modules,
33 # where the CRC of each module is retrieved from the Module.symvers file.
34
35 # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
36 # symbols in the final module linking stage
37 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
38 # This is solely useful to speed up test compiles
39 PHONY := _modpost
40 _modpost: __modpost
41
42 include include/config/auto.conf
43 include scripts/Kbuild.include
44
45 # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
46 ifneq ($(KBUILD_EXTMOD),)
47
48 # set src + obj - they may be used when building the .mod.c file
49 obj := $(KBUILD_EXTMOD)
50 src := $(obj)
51
52 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
53 include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
54 $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
55 endif
56
57 include scripts/Makefile.lib
58
59 kernelsymfile := $(objtree)/Module.symvers
60 modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
61
62 # Step 1), find all modules listed in $(MODVERDIR)/
63 MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
64 __modules := $(shell $(MODLISTCMD))
65 modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
66
67 # Stop after building .o files if NOFINAL is set. Makes compile tests quicker
68 _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
69
70 # Step 2), invoke modpost
71 # Includes step 3,4
72 modpost = scripts/mod/modpost \
73 $(if $(CONFIG_MODVERSIONS),-m) \
74 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
75 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
76 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
77 $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
78 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
79 $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
80 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
81
82 # We can go over command line length here, so be careful.
83 quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
84 cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) -s -T -
85
86 PHONY += __modpost
87 __modpost: $(modules:.ko=.o) FORCE
88 $(call cmd,modpost) $(wildcard vmlinux)
89
90 quiet_cmd_kernel-mod = MODPOST $@
91 cmd_kernel-mod = $(modpost) $@
92
93 vmlinux.o: FORCE
94 $(call cmd,kernel-mod)
95
96 # Declare generated files as targets for modpost
97 $(symverfile): __modpost ;
98 $(modules:.ko=.mod.c): __modpost ;
99
100
101 # Step 5), compile all *.mod.c files
102
103 # modname is set to make c_flags define KBUILD_MODNAME
104 modname = $(notdir $(@:.mod.o=))
105
106 quiet_cmd_cc_o_c = CC $@
107 cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
108 -c -o $@ $<
109
110 $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
111 $(call if_changed_dep,cc_o_c)
112
113 targets += $(modules:.ko=.mod.o)
114
115 # Step 6), final link of the modules
116 quiet_cmd_ld_ko_o = LD [M] $@
117 cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \
118 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
119 -o $@ $(filter-out FORCE,$^)
120
121 $(modules): %.ko :%.o %.mod.o FORCE
122 $(call if_changed,ld_ko_o)
123
124 targets += $(modules)
125
126
127 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
128 # ---------------------------------------------------------------------------
129
130 PHONY += FORCE
131
132 FORCE:
133
134 # Read all saved command lines and dependencies for the $(targets) we
135 # may be building above, using $(if_changed{,_dep}). As an
136 # optimization, we don't need to read them if the target does not
137 # exist, we will rebuild anyway in that case.
138
139 targets := $(wildcard $(sort $(targets)))
140 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
141
142 ifneq ($(cmd_files),)
143 include $(cmd_files)
144 endif
145
146
147 # Declare the contents of the .PHONY variable as phony. We keep that
148 # information in a variable se we can use it in if_changed and friends.
149
150 .PHONY: $(PHONY)