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 # Makefile.lib must be included before Makefile because they contain
  34 # different filechk definitions in 2.6.12.
  35 include scripts/Makefile.lib
  36 include Makefile
  37 CFLAGS_KERNEL += -ffunction-sections -fdata-sections
  38 CFLAGS_MODULE += -ffunction-sections -fdata-sections
  39 ksplice-mods += vmlinux
  40 ksplice-dirs += $(addprefix _ksplice_,$(vmlinux-dirs))
  41 ifdef ksplice-mode-snap
  42 ksplice-before += prepare0 prepare scripts
  43 endif
  44
  45 ksplice-vmlinux-objs = $(filter-out $(head-y),$(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs)))
  46 $(obj)/vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs)
  47 $(obj)/vmlinux.o.KSPLICE: $(call ksplice-objs,$(ksplice-vmlinux-objs)) FORCE
  48         $(call if_changed,ksplice-combine)
  49 ksplice-targets += $(obj)/vmlinux.o.KSPLICE
  50 $(ksplice-vmlinux-objs:=.KSPLICE): $(ksplice-dirs) ;
  51
  52 else    # KERNELRELEASE
  53
  54 include $(srctree)/scripts/Makefile.build
  55 ksplice-mods += $(obj-m:.o=)
  56 ksplice-deps += $(if $(filter $(KSPLICE_ONLY_TARGETS),vmlinux),$(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE))
  57 ksplice-dirs += $(addprefix _ksplice_,$(subdir-ym))
  58
  59 ifdef builtin-target
  60 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y)
  61 $(builtin-target:=.KSPLICE): $(call ksplice-objs,$(obj-y)) FORCE
  62         $(call if_changed,ksplice-combine)
  63 ksplice-targets += $(builtin-target:=.KSPLICE)
  64 endif
  65
  66 ifdef lib-target
  67 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y)
  68 $(lib-target:=.KSPLICE): $(call ksplice-objs,$(lib-y)) FORCE
  69         $(call if_changed,ksplice-combine)
  70 ksplice-targets += $(lib-target:=.KSPLICE)
  71 endif
  72
  73 $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE)): ksplice-link-deps = $(addprefix $(obj)/,$($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-objs))) $($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-y))))
  74 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-y)) FORCE
  75         $(call if_changed,ksplice-combine)
  76 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-m)) FORCE
  77         $(call if_changed,ksplice-combine)
  78 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
  79
  80 ifdef ksplice-mode-snap
  81 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
  82         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
  83           $(call cmd,ksplice-snap))
  84 else
  85 $(obj)/%.o.KSPLICE: $(obj)/%.o
  86         $(call cmd,ksplice-diff)
  87 endif
  88
  89 $(obj)/%.lds.KSPLICE:
  90         $(call cmd,ksplice-ignore)
  91
  92 $(sort $(subdir-obj-y:=.KSPLICE)): $(ksplice-dirs) ;
  93
  94 endif   # KERNELRELEASE
  95
  96 ksplice-modnames = $(filter $(KSPLICE_ONLY_TARGETS),$(notdir $(ksplice-mods)))
  97 ksplice-deps += $(ksplice-modnames:%=$(MODVERDIR)/%.mod.KSPLICE)
  98 $(MODVERDIR)/%.mod.KSPLICE: $(obj)/%.o.KSPLICE
  99         $(rule_ksplice-mod)
 100 .PRECIOUS: $(obj)/%.o.KSPLICE
 101
 102 $(obj)/%.o.KSPLICE_helper: $(obj)/%.o.KSPLICE
 103         $(call cmd,ksplice-helper)
 104
 105 define ksplice-cow-check
 106         $(if $(filter-out %.KSPLICE,$@), \
 107           $(if $(ksplice-mode-diff), \
 108             $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
 109               $(if $(wildcard $@), \
 110                 $(if $(wildcard $@.KSPLICE_pre),, \
 111                   $(call cmd,ksplice-cow))))))
 112
 113 endef
 114
 115 $(foreach v,if_changed if_changed_dep if_changed_rule, \
 116   $(eval $(v)=$$(ksplice-cow-check)$(value $(v))))
 117
 118 __ksplice: $(ksplice-deps) $(ksplice-dirs)
 119         @:
 120
 121 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
 122 ifneq ($(ksplice-cmd-files),)
 123 include $(ksplice-cmd-files)
 124 endif
 125
 126 ksplice := -f $(ksplice-makefile) obj
 127
 128 PHONY += $(ksplice-dirs)
 129 $(ksplice-dirs): $(ksplice-before)
 130         $(Q)$(MAKE) $(ksplice)=$(patsubst _ksplice_%,%,$@)
 131
 132 PHONY += FORCE
 133 FORCE:
 134
 135 .PHONY: $(PHONY)