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