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 ksplice-dirs += $(addprefix _ksplice_,$(vmlinux-dirs))
  46 ifdef ksplice-mode-snap
  47 ksplice-before += prepare0 prepare scripts
  48 endif
  49
  50 ksplice-vmlinux-objs = $(filter-out $(head-y),$(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs)))
  51 $(obj)/vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs)
  52 $(obj)/vmlinux.o.KSPLICE: $(call ksplice-objs,$(ksplice-vmlinux-objs)) FORCE
  53         $(call if_changed,ksplice-combine)
  54 ksplice-targets += $(obj)/vmlinux.o.KSPLICE
  55 $(ksplice-vmlinux-objs:=.KSPLICE): $(ksplice-dirs) ;
  56
  57 else    # KERNELRELEASE
  58
  59 include $(srctree)/scripts/Makefile.build
  60 ksplice-mods += $(obj-m:.o=)
  61 ksplice-deps += $(if $(filter $(KSPLICE_ONLY_TARGETS),vmlinux),$(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE))
  62 ksplice-dirs += $(addprefix _ksplice_,$(subdir-ym))
  63
  64 ifdef builtin-target
  65 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y)
  66 $(builtin-target:=.KSPLICE): $(call ksplice-objs,$(obj-y)) FORCE
  67         $(call if_changed,ksplice-combine)
  68 ksplice-targets += $(builtin-target:=.KSPLICE)
  69 endif
  70
  71 ifdef lib-target
  72 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y)
  73 $(lib-target:=.KSPLICE): $(call ksplice-objs,$(lib-y)) FORCE
  74         $(call if_changed,ksplice-combine)
  75 ksplice-targets += $(lib-target:=.KSPLICE)
  76 endif
  77
  78 $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE)): ksplice-link-deps = $(addprefix $(obj)/,$($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-objs))) $($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-y))))
  79 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-y)) FORCE
  80         $(call if_changed,ksplice-combine)
  81 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-m)) FORCE
  82         $(call if_changed,ksplice-combine)
  83 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
  84
  85 ifdef ksplice-mode-snap
  86 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
  87         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
  88           $(call cmd,ksplice-snap))
  89 else
  90 $(obj)/%.o.KSPLICE: $(obj)/%.o
  91         $(call cmd,ksplice-diff)
  92 endif
  93
  94 $(obj)/%.lds.KSPLICE:
  95         $(call cmd,ksplice-ignore)
  96
  97 $(sort $(subdir-obj-y:=.KSPLICE)): $(ksplice-dirs) ;
  98
  99 endif   # KERNELRELEASE
 100
 101 ksplice-modnames = $(filter $(KSPLICE_ONLY_TARGETS),$(notdir $(ksplice-mods)))
 102 ksplice-deps += $(ksplice-modnames:%=$(MODVERDIR)/%.mod.KSPLICE)
 103 $(MODVERDIR)/%.mod.KSPLICE: $(obj)/%.o.KSPLICE
 104         $(rule_ksplice-mod)
 105 .PRECIOUS: $(obj)/%.o.KSPLICE
 106
 107 $(obj)/%.o.KSPLICE_helper: $(obj)/%.o.KSPLICE
 108         $(call cmd,ksplice-helper)
 109
 110 define ksplice-cow-check
 111         $(if $(filter-out %.KSPLICE,$@), \
 112           $(if $(ksplice-mode-diff), \
 113             $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
 114               $(if $(wildcard $@), \
 115                 $(if $(wildcard $@.KSPLICE_pre),, \
 116                   $(call cmd,ksplice-cow))))))
 117
 118 endef
 119
 120 $(foreach v,if_changed if_changed_dep if_changed_rule, \
 121   $(eval $(v)=$$(ksplice-cow-check)$(value $(v))))
 122
 123 __ksplice: $(ksplice-deps) $(ksplice-dirs)
 124         @:
 125
 126 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
 127 ifneq ($(ksplice-cmd-files),)
 128 include $(ksplice-cmd-files)
 129 endif
 130
 131 ksplice := -f $(ksplice-makefile) obj
 132
 133 PHONY += $(ksplice-dirs)
 134 $(ksplice-dirs): $(ksplice-before)
 135         $(Q)$(MAKE) $(ksplice)=$(patsubst _ksplice_%,%,$@)
 136
 137 PHONY += FORCE
 138 FORCE:
 139
 140 .PHONY: $(PHONY)