Makefile.ksplice

   1 ksplice-makefile := $(word $(words $(MAKEFILE_LIST)), $(MAKEFILE_LIST))
   2 ksplice-script = $(dir $(ksplice-makefile))ksplice-obj.pl
   3
   4 KSPLICE_MODE ?= diff
   5 $(if $(filter_out snap diff,$(KSPLICE_MODE)), \
   6   $(error Invalid KSPLICE_MODE $(KSPLICE_MODE).))
   7 ksplice-mode-$(KSPLICE_MODE) = y
   8
   9 KSPLICE_ONLY_TARGETS ?= %
  10
  11 PHONY := __ksplice
  12 __ksplice:
  13
  14 ksplice-extra = $(filter $(KSPLICE_EXTRA_MATCH),$(lib-y) $(real-objs-m) $(real-objs-y))
  15 ksplice-objs = $(foreach o,$(1),$(o:=.KSPLICE) $(addsuffix .KSPLICE_helper,$(filter $(ksplice-extra),$(o))))
  16
  17 quiet_cmd_ksplice-combine = COMBINE $(@:.KSPLICE=)
  18 cmd_ksplice-combine = $(ksplice-script) combine $@ $(filter $(call ksplice-objs,$(ksplice-link-deps)),$^)
  19 quiet_cmd_ksplice-snap = SNAP    $(@:.KSPLICE=)
  20 cmd_ksplice-snap = $(ksplice-script) snap $@
  21 quiet_cmd_ksplice-diff = DIFF    $(@:.KSPLICE=)
  22 cmd_ksplice-diff = $(ksplice-script) diff $@
  23 quiet_cmd_ksplice-ignore = IGNORE  $(@:.KSPLICE=)
  24 cmd_ksplice-ignore = touch $@
  25 quiet_cmd_ksplice-cow = COW     $@
  26 cmd_ksplice-cow = cp -a $@ $@.KSPLICE_pre
  27 rule_ksplice-mod = $(Q)if [ -s $< ]; then echo $(<:.o.KSPLICE=) > $@; elif [ -e $@ ]; then rm -f $@; fi
  28 quiet_cmd_ksplice-helper = HELPER  $(@:.KSPLICE_helper=)
  29 cmd_ksplice-helper = $(ksplice-script) helper $@
  30
  31 ifeq ($(KERNELRELEASE),)
  32
  33 ifneq ($(wildcard include/linux/compile.h),)
  34 MAKE += --old-file=include/linux/compile.h
  35 endif
  36 # Makefile.lib must be included before Makefile because they contain
  37 # different filechk definitions in 2.6.12.
  38 include scripts/Makefile.lib
  39 include Makefile
  40 CC := ksplice-cc.pl $(CC)
  41 CFLAGS_KSPLICE = -ffunction-sections -fdata-sections -ksplice-cflags-api=1
  42 CFLAGS_KERNEL += $(CFLAGS_KSPLICE)
  43 CFLAGS_MODULE += $(CFLAGS_KSPLICE)
  44 ksplice-mods += vmlinux
  45 ifdef KSPLICE_BUILD_MODULES
  46 ksplice-deps += ksplice_modpost
  47 endif
  48 ksplice-dirs += $(vmlinux-dirs:%=_ksplice_%)
  49 ifdef ksplice-mode-snap
  50 ksplice-before += prepare0 prepare scripts
  51 endif
  52
  53 ksplice-vmlinux-objs = $(filter-out $(head-y),$(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs)))
  54 $(obj)/vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs)
  55 $(obj)/vmlinux.o.KSPLICE: $(call ksplice-objs,$(ksplice-vmlinux-objs)) FORCE
  56         $(call if_changed,ksplice-combine)
  57 ksplice-targets += $(obj)/vmlinux.o.KSPLICE
  58 $(ksplice-vmlinux-objs:=.KSPLICE): $(ksplice-dirs) ;
  59
  60 PHONY += ksplice_modpost ksplice_modinst
  61 ksplice_modpost: $(ksplice-dirs)
  62         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  63 ksplice_modinst: $(ksplice-dirs)
  64         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  65
  66 else    # KERNELRELEASE
  67
  68 ifdef KSPLICE_BUILD_MODULES
  69 KBUILD_MODULES = 1
  70 endif
  71
  72 include $(srctree)/scripts/Makefile.build
  73 ksplice-mods += $(obj-m:.o=)
  74 ksplice-deps += $(if $(filter $(KSPLICE_ONLY_TARGETS),vmlinux),$(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE))
  75 ifdef KSPLICE_BUILD_MODULES
  76 ksplice-deps += $(obj-m)
  77 endif
  78 ksplice-dirs += $(subdir-ym:%=_ksplice_%)
  79
  80 ifdef builtin-target
  81 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y)
  82 $(builtin-target:=.KSPLICE): $(call ksplice-objs,$(obj-y)) FORCE
  83         $(call if_changed,ksplice-combine)
  84 ksplice-targets += $(builtin-target:=.KSPLICE)
  85 endif
  86
  87 ifdef lib-target
  88 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y)
  89 $(lib-target:=.KSPLICE): $(call ksplice-objs,$(lib-y)) FORCE
  90         $(call if_changed,ksplice-combine)
  91 ksplice-targets += $(lib-target:=.KSPLICE)
  92 endif
  93
  94 $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE)): ksplice-link-deps = $($(@:$(obj)/%.o.KSPLICE=%-objs):%=$(obj)/%) $($(@:$(obj)/%.o.KSPLICE=%-y):%=$(obj)/%)
  95 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-y)) FORCE
  96         $(call if_changed,ksplice-combine)
  97 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-m)) FORCE
  98         $(call if_changed,ksplice-combine)
  99 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
 100
 101 ifdef ksplice-mode-snap
 102 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
 103         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
 104           $(call cmd,ksplice-snap))
 105 else
 106 $(obj)/%.o.KSPLICE: $(obj)/%.o
 107         $(call cmd,ksplice-diff)
 108 endif
 109
 110 $(obj)/%.lds.KSPLICE:
 111         $(call cmd,ksplice-ignore)
 112
 113 $(sort $(subdir-obj-y:=.KSPLICE)): $(ksplice-dirs) ;
 114
 115 endif   # KERNELRELEASE
 116
 117 ksplice-modnames = $(filter $(KSPLICE_ONLY_TARGETS),$(notdir $(ksplice-mods)))
 118 ksplice-deps += $(ksplice-modnames:%=$(MODVERDIR)/%.mod.KSPLICE)
 119 $(MODVERDIR)/%.mod.KSPLICE: $(obj)/%.o.KSPLICE
 120         $(rule_ksplice-mod)
 121 .PRECIOUS: $(obj)/%.o.KSPLICE
 122
 123 $(obj)/%.o.KSPLICE_helper: $(obj)/%.o.KSPLICE
 124         $(call cmd,ksplice-helper)
 125
 126 ifdef ksplice-mode-diff
 127
 128 define ksplice-cow-check
 129         $(if $(filter-out %.KSPLICE,$@), \
 130           $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
 131             $(if $(wildcard $@), \
 132               $(if $(wildcard $@.KSPLICE_pre),, \
 133                 $(call cmd,ksplice-cow)))))
 134
 135 endef
 136
 137 define ksplice-add-cow-check
 138 $(v) = $$(ksplice-cow-check)$(value $(v))
 139
 140 endef
 141
 142 ksplice-cow-eval += $(foreach v,if_changed if_changed_dep if_changed_rule,$(ksplice-add-cow-check))
 143
 144 endif   # ksplice-mode-diff
 145
 146 __ksplice: $(ksplice-deps) $(ksplice-dirs)
 147         @:
 148
 149 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
 150 ifneq ($(ksplice-cmd-files),)
 151 $(ksplice-cmd-files): ;
 152 include $(ksplice-cmd-files)
 153 endif
 154
 155 PHONY += $(ksplice-dirs)
 156 $(ksplice-dirs): $(ksplice-before)
 157         $(Q)$(MAKE) -f $(ksplice-makefile) obj=$(@:_ksplice_%=%)
 158
 159 $(eval $(ksplice-cow-eval))
 160
 161 PHONY += FORCE
 162 FORCE:
 163
 164 .PHONY: $(PHONY)