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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/scripts/Makefile.modpost
....@@ -6,23 +6,22 @@
66 # Stage one of module building created the following:
77 # a) The individual .o files used for the module
88 # b) A <module>.o file which is the .o files above linked together
9
-# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
10
-#    the preliminary <module>.o file, plus all .o files
9
+# c) A <module>.mod file, listing the name of the preliminary <module>.o file,
10
+#    plus all .o files
11
+# d) modules.order, which lists all the modules
1112 
1213 # Stage 2 is handled by this file and does the following
13
-# 1) Find all modules from the files listed in $(MODVERDIR)/
14
+# 1) Find all modules listed in modules.order
1415 # 2) modpost is then used to
1516 # 3)  create one <module>.mod.c file pr. module
1617 # 4)  create one Module.symvers file with CRC for all exported symbols
17
-# 5) compile all <module>.mod.c files
18
-# 6) final link of the module to a <module.ko> file
1918 
2019 # Step 3 is used to place certain information in the module's ELF
2120 # section, including information such as:
2221 #   Version magic (see include/linux/vermagic.h for full details)
2322 #     - Kernel release
2423 #     - SMP is CONFIG_SMP
25
-#     - PREEMPT is CONFIG_PREEMPT
24
+#     - PREEMPT is CONFIG_PREEMPT[_RT]
2625 #     - GCC Version
2726 #   Module info
2827 #     - Module version (MODULE_VERSION)
....@@ -37,146 +36,151 @@
3736 # symbols in the final module linking stage
3837 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
3938 # This is solely useful to speed up test compiles
40
-PHONY := _modpost
41
-_modpost: __modpost
39
+
40
+PHONY := __modpost
41
+__modpost:
4242 
4343 include include/config/auto.conf
4444 include scripts/Kbuild.include
4545 
46
-# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info
47
-ifneq ($(KBUILD_EXTMOD),)
46
+# for ld_flags
47
+include scripts/Makefile.lib
4848 
49
-# set src + obj - they may be used when building the .mod.c file
49
+mixed-build-prefix = $(if $(KBUILD_MIXED_TREE),$(KBUILD_MIXED_TREE)/)
50
+
51
+MODPOST = scripts/mod/modpost								\
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+	$(if $(CONFIG_MODVERSIONS),-m)							\
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+	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)					\
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+	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)					\
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+	$(if $(KBUILD_MODPOST_WARN),-w) \
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+	-o $@
57
+
58
+ifdef MODPOST_VMLINUX
59
+
60
+quiet_cmd_modpost = MODPOST $@
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+      cmd_modpost = $(MODPOST) $<
62
+
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+vmlinux.symvers: vmlinux.o
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+	$(call cmd,modpost)
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+
66
+__modpost: vmlinux.symvers
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+
68
+else
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+
70
+ifeq ($(KBUILD_EXTMOD),)
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+
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+input-symdump := $(mixed-build-prefix)vmlinux.symvers
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+output-symdump := modules-only.symvers
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+module_srcpath := $(srctree)
75
+
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+quiet_cmd_cat = GEN     $@
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+      cmd_cat = cat $(real-prereqs) > $@
78
+
79
+ifneq ($(wildcard $(mixed-build-prefix)vmlinux.symvers),)
80
+
81
+__modpost: Module.symvers
82
+Module.symvers: $(mixed-build-prefix)vmlinux.symvers modules-only.symvers FORCE
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+	$(call if_changed,cat)
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+
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+targets += Module.symvers
86
+
87
+endif
88
+
89
+else
90
+
91
+# set src + obj - they may be used in the modules's Makefile
5092 obj := $(KBUILD_EXTMOD)
5193 src := $(obj)
5294 
5395 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
54
-include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
55
-             $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
96
+include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, $(src)/Makefile)
97
+
98
+# modpost option for external modules
99
+MODPOST += -e
100
+
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+input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)
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+output-symdump := $(KBUILD_EXTMOD)/Module.symvers
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+
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+# Get the external module's source path. KBUILD_EXTMOD could either be an
105
+# absolute path or relative path from $(srctree). This makes sure that we
106
+# aren't using a relative path from a separate working directory (O= or
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+# KBUILD_OUTPUT) since that may not be the actual module's SCM project path. So
108
+# check the path relative to $(srctree) first.
109
+ifneq ($(realpath $(srctree)/$(KBUILD_EXTMOD) 2>/dev/null),)
110
+	module_srcpath := $(srctree)/$(KBUILD_EXTMOD)
111
+else
112
+	module_srcpath := $(KBUILD_EXTMOD)
56113 endif
57114 
58
-include scripts/Makefile.lib
115
+endif
59116 
60
-kernelsymfile := $(objtree)/Module.symvers
61
-modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
117
+ifeq ($(CONFIG_MODULE_SCMVERSION),y)
118
+# Get the SCM version of the module. `sed` verifies setlocalversion returns
119
+# a proper revision based on the SCM type, e.g. git, mercurial, or svn.
120
+module_scmversion := $(shell $(srctree)/scripts/setlocalversion $(module_srcpath) | \
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+	sed -n 's/.*-\(\(g\|hg\)[a-fA-F0-9]\+\(-dirty\)\?\|svn[0-9]\+\).*/\1/p')
122
+ifneq ($(module_scmversion),)
123
+MODPOST += -v $(module_scmversion)
124
+endif
125
+endif
62126 
63
-# Step 1), find all modules listed in $(MODVERDIR)/
64
-MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
65
-__modules := $(shell $(MODLISTCMD))
66
-modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
127
+# modpost options for modules (both in-kernel and external)
128
+MODPOST += \
129
+	$(addprefix -i ,$(wildcard $(input-symdump))) \
130
+	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
131
+	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
67132 
68
-# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
69
-_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
133
+# 'make -i -k' ignores compile errors, and builds as many modules as possible.
134
+ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
135
+MODPOST += -n
136
+endif
70137 
71
-# Step 2), invoke modpost
72
-#  Includes step 3,4
73
-modpost = scripts/mod/modpost                    \
74
- $(if $(CONFIG_MODVERSIONS),-m)                  \
75
- $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,)       \
76
- $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)   \
77
- $(if $(KBUILD_EXTMOD),-I $(modulesymfile))      \
78
- $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \
79
- $(if $(KBUILD_EXTMOD),-o $(modulesymfile))      \
80
- $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S)      \
81
- $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)  \
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- $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
83
-
84
-MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
85
-
86
-# If CONFIG_LTO_CLANG is enabled, .o files are either LLVM IR, or empty, so we
87
-# need to link them into actual objects before passing them to modpost
88
-modpost-ext = $(if $(CONFIG_LTO_CLANG),.lto,)
138
+# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
139
+VPATH :=
140
+$(input-symdump):
141
+	@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
142
+	@echo >&2 '         Modules may not have dependencies or modversions.'
89143 
90144 ifdef CONFIG_LTO_CLANG
91
-quiet_cmd_cc_lto_link_modules = LD [M]  $@
92
-cmd_cc_lto_link_modules =						\
93
-	$(LD) $(ld_flags) -r -o $(@)					\
94
-		$(shell [ -s $(@:$(modpost-ext).o=.o.symversions) ] &&	\
95
-			echo -T $(@:$(modpost-ext).o=.o.symversions))	\
96
-		--whole-archive $(filter-out FORCE,$^)
145
+# With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run
146
+# LTO to compile them into native code before running modpost
147
+prelink-ext := .lto
97148 
98
-$(modules:.ko=$(modpost-ext).o): %$(modpost-ext).o: %.o FORCE
149
+quiet_cmd_cc_lto_link_modules = LTO [M] $@
150
+cmd_cc_lto_link_modules =						\
151
+	$(LD) $(ld_flags) -r -o $@					\
152
+		$(shell [ -s $(@:.lto.o=.o.symversions) ] &&		\
153
+			echo -T $(@:.lto.o=.o.symversions))		\
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+		--whole-archive $^
155
+
156
+%.lto.o: %.o
99157 	$(call if_changed,cc_lto_link_modules)
100158 endif
101159 
102
-# We can go over command line length here, so be careful.
103
-quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
104
-      cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/$(modpost-ext)\.o/' | $(modpost) $(MODPOST_OPT) -s -T -
160
+modules := $(sort $(shell cat $(MODORDER)))
105161 
106
-PHONY += __modpost
107
-__modpost: $(modules:.ko=$(modpost-ext).o) FORCE
108
-	$(call cmd,modpost) $(wildcard vmlinux)
162
+# Read out modules.order to pass in modpost.
163
+# Otherwise, allmodconfig would fail with "Argument list too long".
164
+quiet_cmd_modpost = MODPOST $@
165
+      cmd_modpost = sed 's/\.ko$$/$(prelink-ext)\.o/' $< | $(MODPOST) -T -
109166 
110
-quiet_cmd_kernel-mod = MODPOST $@
111
-      cmd_kernel-mod = $(modpost) $@
167
+$(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(prelink-ext).o) FORCE
168
+	$(call if_changed,modpost)
112169 
113
-vmlinux.o: FORCE
114
-	$(call cmd,kernel-mod)
170
+targets += $(output-symdump)
115171 
116
-# Declare generated files as targets for modpost
117
-$(modules:.ko=.mod.c): __modpost ;
118
-
119
-# Step 5), compile all *.mod.c files
120
-
121
-# modname is set to make c_flags define KBUILD_MODNAME
122
-modname = $(notdir $(@:.mod.o=))
123
-
124
-quiet_cmd_cc_o_c = CC      $@
125
-      cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
126
-		   -c -o $@ $<
127
-
128
-$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
129
-	$(call if_changed_dep,cc_o_c)
130
-
131
-targets += $(modules:.ko=.mod.o)
132
-
133
-ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
134
-
135
-# Step 6), final link of the modules with optional arch pass after final link
136
-quiet_cmd_ld_ko_o = LD [M]  $@
137
-
138
-ifdef CONFIG_LTO_CLANG
139
-      cmd_ld_ko_o = 							\
140
-	$(LD) -r $(LDFLAGS)                                 		\
141
-		 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) 		\
142
-		 $(shell [ -s $(@:.ko=.o.symversions) ] &&		\
143
-			echo -T $(@:.ko=.o.symversions))  		\
144
-		 -o $@ --whole-archive					\
145
-		 $(filter-out FORCE,$(^:$(modpost-ext).o=.o))
146
-
147
-  ifdef CONFIG_FTRACE_MCOUNT_RECORD
148
-      cmd_ld_ko_o += ; $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) $@
149
-  endif
150
-else
151
-      cmd_ld_ko_o =                                                     \
152
-	$(LD) -r $(KBUILD_LDFLAGS)                                      \
153
-                 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)             \
154
-                 -o $@ $(filter-out FORCE,$^) ;                         \
155
-	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
172
+__modpost: $(output-symdump)
173
+ifneq ($(KBUILD_MODPOST_NOFINAL),1)
174
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
156175 endif
157176 
158
-$(modules): %.ko: %$(modpost-ext).o %.mod.o FORCE
159
-	+$(call if_changed,ld_ko_o)
160
-
161
-targets += $(modules)
162
-
163
-
164
-# Add FORCE to the prequisites of a target to force it to be always rebuilt.
165
-# ---------------------------------------------------------------------------
166
-
167177 PHONY += FORCE
168
-
169178 FORCE:
170179 
171
-# Read all saved command lines and dependencies for the $(targets) we
172
-# may be building above, using $(if_changed{,_dep}). As an
173
-# optimization, we don't need to read them if the target does not
174
-# exist, we will rebuild anyway in that case.
180
+existing-targets := $(wildcard $(sort $(targets)))
175181 
176
-cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
182
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
177183 
178
-ifneq ($(cmd_files),)
179
-  include $(cmd_files)
180184 endif
181185 
182186 .PHONY: $(PHONY)