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 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-ignore = IGNORE  $(@:.KSPLICE=)
  19 cmd_ksplice-ignore = touch $@
  20 quiet_cmd_ksplice-cow = COW     $@
  21 cmd_ksplice-cow = cp -a $@ $@.KSPLICE_pre
  22 rule_ksplice-mod = $(Q)if [ -s $< ]; then echo $(<:.o.KSPLICE=) > $@; elif [ -e $@ ]; then rm -f $@; fi
  23
  24 ifeq ($(KERNELRELEASE),)
  25
  26 # Makefile.lib must be included before Makefile because they contain
  27 # different filechk definitions in 2.6.12.
  28 include scripts/Makefile.lib
  29 include Makefile
  30 CFLAGS_KERNEL += -ffunction-sections -fdata-sections
  31 CFLAGS_MODULE += -ffunction-sections -fdata-sections
  32 ksplice-deps += $(MODVERDIR)/vmlinux.mod.KSPLICE
  33 ksplice-dirs += $(addprefix _ksplice_,$(vmlinux-dirs))
  34 ifdef ksplice-mode-snap
  35 ksplice-before += prepare0 prepare scripts
  36 endif
  37
  38 ksplice-vmlinux-objs = $(filter-out $(head-y),$(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs)))
  39 vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs:=.KSPLICE)
  40 vmlinux.o.KSPLICE: $(ksplice-vmlinux-objs:=.KSPLICE) FORCE
  41         $(call if_changed,ksplice-combine)
  42 ksplice-targets += vmlinux.o.KSPLICE
  43 $(ksplice-vmlinux-objs:=.KSPLICE): $(ksplice-dirs) ;
  44
  45 $(MODVERDIR)/vmlinux.mod.KSPLICE: vmlinux.o.KSPLICE
  46         $(rule_ksplice-mod)
  47
  48 else    # KERNELRELEASE
  49
  50 include $(srctree)/scripts/Makefile.build
  51 ksplice-deps += $(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE) $(addprefix $(MODVERDIR)/,$(notdir $(obj-m:.o=.mod.KSPLICE)))
  52 ksplice-dirs += $(addprefix _ksplice_,$(subdir-ym))
  53
  54 ifdef builtin-target
  55 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y:=.KSPLICE)
  56 $(builtin-target:=.KSPLICE): $(obj-y:=.KSPLICE) FORCE
  57         $(call if_changed,ksplice-combine)
  58 ksplice-targets += $(builtin-target:=.KSPLICE)
  59 endif
  60
  61 ifdef lib-target
  62 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y:=.KSPLICE)
  63 $(lib-target:=.KSPLICE): $(lib-y:=.KSPLICE) FORCE
  64         $(call if_changed,ksplice-combine)
  65 ksplice-targets += $(lib-target:=.KSPLICE)
  66 endif
  67
  68 $(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)))))
  69 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(multi-objs-y:=.KSPLICE) FORCE
  70         $(call if_changed,ksplice-combine)
  71 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(multi-objs-m:=.KSPLICE) FORCE
  72         $(call if_changed,ksplice-combine)
  73 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
  74
  75 ifdef ksplice-mode-snap
  76 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
  77         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
  78           $(call cmd,ksplice-snap))
  79 else
  80 $(obj)/%.o.KSPLICE: $(obj)/%.o
  81         $(call cmd,ksplice-diff)
  82 endif
  83
  84 $(obj)/%.lds.KSPLICE:
  85         $(call cmd,ksplice-ignore)
  86
  87 $(sort $(subdir-obj-y:=.KSPLICE)): $(ksplice-dirs) ;
  88
  89 $(MODVERDIR)/%.mod.KSPLICE: $(obj)/%.o.KSPLICE
  90         $(rule_ksplice-mod)
  91 .PRECIOUS: $(obj)/%.o.KSPLICE
  92
  93 endif   # KERNELRELEASE
  94
  95 define ksplice-cow-check
  96         $(if $(filter-out %.KSPLICE,$@), \
  97           $(if $(ksplice-mode-diff), \
  98             $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
  99               $(if $(wildcard $@), \
 100                 $(if $(wildcard $@.KSPLICE_pre),, \
 101                   $(call cmd,ksplice-cow))))))
 102
 103 endef
 104
 105 $(foreach v,if_changed if_changed_dep if_changed_rule, \
 106   $(eval $(v)=$$(ksplice-cow-check)$(value $(v))))
 107
 108 __ksplice: $(ksplice-deps) $(ksplice-dirs)
 109         @:
 110
 111 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
 112 ifneq ($(ksplice-cmd-files),)
 113 include $(ksplice-cmd-files)
 114 endif
 115
 116 ksplice := -f $(ksplice-makefile) obj
 117
 118 PHONY += $(ksplice-dirs)
 119 $(ksplice-dirs): $(ksplice-before)
 120         $(Q)$(MAKE) $(ksplice)=$(patsubst _ksplice_%,%,$@)
 121
 122 PHONY += FORCE
 123 FORCE:
 124
 125 .PHONY: $(PHONY)