Makefile.ksplice

   1 ksplice-makefile := $(word $(words $(MAKEFILE_LIST)), $(MAKEFILE_LIST))
   2 ksplice-script = $(dir $(ksplice-makefile))ksplice.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 PHONY := __ksplice
  10 __ksplice:
  11
  12 quiet_cmd_ksplice-combine = COMBINE $(@:.KSPLICE=)
  13 cmd_ksplice-combine = $(ksplice-script) combine $@ $(filter $(ksplice-link-deps),$^)
  14 quiet_cmd_ksplice-snap = SNAP    $(@:.KSPLICE=)
  15 cmd_ksplice-snap = $(ksplice-script) snap $@
  16 quiet_cmd_ksplice-diff = DIFF    $(@:.KSPLICE=)
  17 cmd_ksplice-diff = $(ksplice-script) diff $@
  18 quiet_cmd_ksplice-cow = COW     $@
  19 cmd_ksplice-cow = cp -a $@ $@.KSPLICE_pre
  20
  21 ifeq ($(KERNELRELEASE),)
  22
  23 # Makefile.lib must be included before Makefile because they contain
  24 # different filechk definitions in 2.6.12.
  25 include scripts/Makefile.lib
  26 include Makefile
  27 CFLAGS_KERNEL += -ffunction-sections -fdata-sections
  28 CFLAGS_MODULE += -ffunction-sections -fdata-sections
  29 ksplice-deps += vmlinux.o.KSPLICE
  30 ksplice-dirs += $(addprefix _ksplice_,$(vmlinux-dirs))
  31 ksplice-before += prepare0 prepare scripts
  32
  33 ksplice-vmlinux-objs = $(filter-out $(head-y),$(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs)))
  34 vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs:=.KSPLICE)
  35 vmlinux.o.KSPLICE: $(ksplice-vmlinux-objs:=.KSPLICE) FORCE
  36         $(call if_changed,ksplice-combine)
  37 ksplice-targets += vmlinux.o.KSPLICE
  38 $(ksplice-vmlinux-objs:=.KSPLICE): $(ksplice-dirs) ;
  39
  40 else    # KERNELRELEASE
  41
  42 include $(srctree)/scripts/Makefile.build
  43 ksplice-deps += $(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE) $(obj-m:=.KSPLICE)
  44 ksplice-dirs += $(addprefix _ksplice_,$(subdir-ym))
  45
  46 ifdef builtin-target
  47 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y:=.KSPLICE)
  48 $(builtin-target:=.KSPLICE): $(obj-y:=.KSPLICE) FORCE
  49         $(call if_changed,ksplice-combine)
  50 ksplice-targets += $(builtin-target:=.KSPLICE)
  51 endif
  52
  53 ifdef lib-target
  54 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y:=.KSPLICE)
  55 $(lib-target:=.KSPLICE): $(lib-y:=.KSPLICE) FORCE
  56         $(call if_changed,ksplice-combine)
  57 ksplice-targets += $(lib-target:=.KSPLICE)
  58 endif
  59
  60 $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE)): ksplice-link-deps = $(addsuffix .KSPLICE,$(addprefix $(obj)/,$($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-objs))) $($(patsubst $(obj)/%,%,$(@:.o.KSPLICE=-y)))))
  61 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(multi-objs-y:=.KSPLICE) FORCE
  62         $(call if_changed,ksplice-combine)
  63 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(multi-objs-m:=.KSPLICE) FORCE
  64         $(call if_changed,ksplice-combine)
  65 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
  66
  67 ifdef ksplice-mode-snap
  68 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
  69         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
  70           $(call cmd,ksplice-snap))
  71 else
  72 $(obj)/%.o.KSPLICE: $(obj)/%.o
  73         $(call cmd,ksplice-diff)
  74 endif
  75
  76 $(sort $(subdir-obj-y:=.KSPLICE)): $(ksplice-dirs) ;
  77
  78 endif   # KERNELRELEASE
  79
  80 define ksplice-cow-check
  81         $(if $(filter-out %.KSPLICE,$@), \
  82           $(if $(ksplice-mode-diff), \
  83             $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
  84               $(if $(wildcard $@), \
  85                 $(if $(wildcard $@.KSPLICE_pre),, \
  86                   $(call cmd,ksplice-cow))))))
  87
  88 endef
  89
  90 $(foreach v,if_changed if_changed_dep if_changed_rule, \
  91   $(eval $(v)=$$(ksplice-cow-check)$(value $(v))))
  92
  93 __ksplice: $(ksplice-deps) $(ksplice-dirs)
  94         @:
  95
  96 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
  97 ifneq ($(ksplice-cmd-files),)
  98 include $(ksplice-cmd-files)
  99 endif
 100
 101 ksplice := -f $(ksplice-makefile) obj
 102
 103 PHONY += $(ksplice-dirs)
 104 $(ksplice-dirs): $(ksplice-before)
 105         $(Q)$(MAKE) $(ksplice)=$(patsubst _ksplice_%,%,$@)
 106
 107 PHONY += FORCE
 108 FORCE:
 109
 110 .PHONY: $(PHONY)