Kbuild

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Kbuild for top-level directory of the kernel
   4
   5 # Prepare global headers and check sanity before descending into sub-directories
   6 # ---------------------------------------------------------------------------
   7
   8 # Generate bounds.h
   9
  10 bounds-file := include/generated/bounds.h
  11
  12 targets := kernel/bounds.s
  13
  14 $(bounds-file): kernel/bounds.s FORCE
  15         $(call filechk,offsets,__LINUX_BOUNDS_H__)
  16
  17 # Generate timeconst.h
  18
  19 timeconst-file := include/generated/timeconst.h
  20
  21 filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
  22
  23 $(timeconst-file): kernel/time/timeconst.bc FORCE
  24         $(call filechk,gentimeconst)
  25
  26 # Generate asm-offsets.h
  27
  28 offsets-file := include/generated/asm-offsets.h
  29
  30 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  31
  32 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
  33
  34 $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
  35         $(call filechk,offsets,__ASM_OFFSETS_H__)
  36
  37 # Check for missing system calls
  38
  39 quiet_cmd_syscalls = CALL    $<
  40       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  41
  42 PHONY += missing-syscalls
  43 missing-syscalls: scripts/checksyscalls.sh $(offsets-file)
  44         $(call cmd,syscalls)
  45
  46 # Check atomic headers are up-to-date
  47
  48 quiet_cmd_atomics = CALL    $<
  49       cmd_atomics = $(CONFIG_SHELL) $<
  50
  51 PHONY += old-atomics
  52 old-atomics: scripts/atomic/check-atomics.sh
  53         $(call cmd,atomics)
  54
  55 # A phony target that depends on all the preparation targets
  56
  57 PHONY += prepare
  58 prepare: $(offsets-file) missing-syscalls old-atomics
  59         @: