1# SPDX-License-Identifier: GPL-2.0 2# 3# Kbuild for top-level directory of the kernel 4# This file takes care of the following: 5# 1) Generate bounds.h 6# 2) Generate timeconst.h 7# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) 8# 4) Check for missing system calls 9# 5) check atomics headers are up-to-date 10# 6) Generate constants.py (may need bounds.h) 11 12##### 13# 1) Generate bounds.h 14 15bounds-file := include/generated/bounds.h 16 17always := $(bounds-file) 18targets := kernel/bounds.s 19 20$(bounds-file): kernel/bounds.s FORCE 21 $(call filechk,offsets,__LINUX_BOUNDS_H__) 22 23##### 24# 2) Generate timeconst.h 25 26timeconst-file := include/generated/timeconst.h 27 28targets += $(timeconst-file) 29 30filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $< 31 32$(timeconst-file): kernel/time/timeconst.bc FORCE 33 $(call filechk,gentimeconst) 34 35##### 36# 3) Generate asm-offsets.h 37# 38 39offsets-file := include/generated/asm-offsets.h 40 41always += $(offsets-file) 42targets += arch/$(SRCARCH)/kernel/asm-offsets.s 43 44arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file) 45 46$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE 47 $(call filechk,offsets,__ASM_OFFSETS_H__) 48 49##### 50# 4) Check for missing system calls 51# 52 53always += missing-syscalls 54targets += missing-syscalls 55 56quiet_cmd_syscalls = CALL $< 57 cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) 58 59missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE 60 $(call cmd,syscalls) 61 62##### 63# 5) Check atomic headers are up-to-date 64# 65 66always += old-atomics 67targets += old-atomics 68 69quiet_cmd_atomics = CALL $< 70 cmd_atomics = $(CONFIG_SHELL) $< 71 72old-atomics: scripts/atomic/check-atomics.sh FORCE 73 $(call cmd,atomics) 74 75##### 76# 6) Generate constants for Python GDB integration 77# 78 79extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py 80 81build_constants_py: $(timeconst-file) $(bounds-file) 82 @$(MAKE) $(build)=scripts/gdb/linux $@ 83 84# Keep these three files during make clean 85no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) 86