#
  # Kbuild for top-level directory of the kernel
  # This file takes care of the following:
  # 1) Generate asm-offsets.h

  # 2) Check for missing system calls

  
  #####

  # 1) Generate asm-offsets.h

  #
  
  offsets-file := include/asm-$(ARCH)/asm-offsets.h
  
  always  := $(offsets-file)
  targets := $(offsets-file)
  targets += arch/$(ARCH)/kernel/asm-offsets.s

  clean-files := $(addprefix $(objtree)/,$(targets))

  # Default sed regexp - multiline due to syntax constraints
  define sed-y
  	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
  endef
  # Override default regexp for specific architectures

  sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"

  quiet_cmd_offsets = GEN     $@
  define cmd_offsets

  	(set -e; \
  	 echo "#ifndef __ASM_OFFSETS_H__"; \
  	 echo "#define __ASM_OFFSETS_H__"; \
  	 echo "/*"; \
  	 echo " * DO NOT MODIFY."; \
  	 echo " *"; \

  	 echo " * This file was generated by Kbuild"; \

  	 echo " *"; \
  	 echo " */"; \
  	 echo ""; \

  	 sed -ne $(sed-y) $<; \

  	 echo ""; \
  	 echo "#endif" ) > $@
  endef
  
  # We use internal kbuild rules to avoid the "is up to date" message from make
  arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE
  	$(Q)mkdir -p $(dir $@)
  	$(call if_changed_dep,cc_s_c)

  $(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild

  	$(Q)mkdir -p $(dir $@)

  	$(call cmd,offsets)

  #####
  # 2) Check for missing system calls
  #
  
  quiet_cmd_syscalls = CALL    $<
        cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
  
  PHONY += missing-syscalls
  missing-syscalls: scripts/checksyscalls.sh FORCE
  	$(call cmd,syscalls)