# SPDX-License-Identifier: GPL-2.0## Kbuild for top-level directory of the kernel# This file takes care of the following:# 1) Generate bounds.h# 2) Generate timeconst.h# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)# 4) Check for missing system calls# 5) Generate constants.py (may need bounds.h) ###### 1) Generate bounds.h bounds-file := include/generated/bounds.h always  := $(bounds-file)targets := kernel/bounds.s $(bounds-file): kernel/bounds.s FORCE	$(call filechk,offsets,__LINUX_BOUNDS_H__) ###### 2) Generate timeconst.h timeconst-file := include/generated/timeconst.h targets += $(timeconst-file) filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $< $(timeconst-file): kernel/time/timeconst.bc FORCE	$(call filechk,gentimeconst) ###### 3) Generate asm-offsets.h# offsets-file := include/generated/asm-offsets.h always  += $(offsets-file)targets += arch/$(SRCARCH)/kernel/asm-offsets.s arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file) $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE	$(call filechk,offsets,__ASM_OFFSETS_H__) ###### 4) Check for missing system calls# always += missing-syscallstargets += missing-syscalls quiet_cmd_syscalls = CALL    $<      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE	$(call cmd,syscalls) ###### 5) Generate constants for Python GDB integration# extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py build_constants_py: $(timeconst-file) $(bounds-file)	@$(MAKE) $(build)=scripts/gdb/linux $@ # Keep these three files during make cleanno-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)