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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | # SPDX-License-Identifier: GPL-2.0 # =========================================================================== # Module versions # =========================================================================== # # Stage one of module building created the following: # a) The individual .o files used for the module # b) A <module>.o file which is the .o files above linked together # c) A <module>.mod file, listing the name of the preliminary <module>.o file, # plus all .o files # d) modules.order, which lists all the modules # Stage 2 is handled by this file and does the following # 1) Find all modules listed in modules.order # 2) modpost is then used to # 3) create one <module>.mod.c file per module # 4) create one Module.symvers file with CRC for all exported symbols # Step 3 is used to place certain information in the module's ELF # section, including information such as: # Version magic (see include/linux/vermagic.h for full details) # - Kernel release # - SMP is CONFIG_SMP # - PREEMPT is CONFIG_PREEMPT[_RT] # - GCC Version # Module info # - Module version (MODULE_VERSION) # - Module alias'es (MODULE_ALIAS) # - Module license (MODULE_LICENSE) # - See include/linux/module.h for more details # Step 4 is solely used to allow module versioning in external modules, # where the CRC of each module is retrieved from the Module.symvers file. # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. # This is solely useful to speed up test compiles PHONY := __modpost __modpost: include include/config/auto.conf include $(srctree)/scripts/Kbuild.include # for mod-prelink-ext include $(srctree)/scripts/Makefile.lib MODPOST = scripts/mod/modpost \ $(if $(CONFIG_MODVERSIONS),-m) \ $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ -o $@ ifdef MODPOST_VMLINUX quiet_cmd_modpost = MODPOST $@ cmd_modpost = $(MODPOST) $< vmlinux.symvers: __KEEPMAKEFILEO__B.o $(call cmd,modpost) __modpost: vmlinux.symvers else ifeq ($(KBUILD_EXTMOD),) input-symdump := vmlinux.symvers output-symdump := modules-only.symvers quiet_cmd_cat = GEN $@ cmd_cat = cat $(real-prereqs) > $@ ifneq ($(wildcard vmlinux.symvers),) __modpost: Module.symvers Module.symvers: vmlinux.symvers modules-only.symvers FORCE $(call if_changed,cat) targets += Module.symvers endif else # set src + obj - they may be used in the modules's Makefile obj := $(KBUILD_EXTMOD) src := $(obj) # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, $(src)/Makefile) # modpost option for external modules MODPOST += -e input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS) output-symdump := $(KBUILD_EXTMOD)/Module.symvers endif existing-input-symdump := $(wildcard $(input-symdump)) # modpost options for modules (both in-kernel and external) MODPOST += \ $(addprefix -i ,$(existing-input-symdump)) \ $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) # 'make -i -k' ignores compile errors, and builds as many modules as possible. ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) MODPOST += -n endif # Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree). VPATH := $(input-symdump): @echo >&2 'WARNING: Symbol version dump "$@" is missing.' @echo >&2 ' Modules may not have dependencies or modversions.' @echo >&2 ' You may get many unresolved symbol warnings.' modules := $(sort $(shell cat $(MODORDER))) # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),) MODPOST += -w endif # Read out modules.order to pass in modpost. # Otherwise, allmodconfig would fail with "Argument list too long". quiet_cmd_modpost = MODPOST $@ cmd_modpost = sed 's/\.ko$$/$(mod-prelink-ext)\.o/' $< | $(MODPOST) -T - $(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(mod-prelink-ext).o) FORCE $(call if_changed,modpost) targets += $(output-symdump) __modpost: $(output-symdump) ifneq ($(KBUILD_MODPOST_NOFINAL),1) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal endif PHONY += FORCE FORCE: existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) endif .PHONY: $(PHONY) |