8d32588077
Now that all the generated atomic headers are in place, it would be good to ensure that: a) the headers are up-to-date when scripting changes. b) developers don't directly modify the generated headers. To ensure both of these properties, let's add a Kbuild step to check that the generated headers are up-to-date. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com Cc: Will Deacon <will.deacon@arm.com> Cc: linuxdrivers@attotech.com Cc: dvyukov@google.com Cc: Boqun Feng <boqun.feng@gmail.com> Cc: arnd@arndb.de Cc: aryabinin@virtuozzo.com Cc: glider@google.com Link: http://lkml.kernel.org/r/20180904104830.2975-6-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2.5 KiB
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) check atomics headers are up-to-date
6) Generate constants.py (may need bounds.h)
1) Generate bounds.h
bounds-file := include/generated/bounds.h
always := $(bounds-file) targets := kernel/bounds.s
We use internal kbuild rules to avoid the "is up to date" message from make
kernel/bounds.s: kernel/bounds.c FORCE $(call if_changed_dep,cc_s_c)
$(obj)/$(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)
quiet_cmd_gentimeconst = GEN $@ define cmd_gentimeconst (echo $(CONFIG_HZ) | bc -q $< ) > $@ endef define filechk_gentimeconst (echo $(CONFIG_HZ) | bc -q $< ) endef
$(obj)/$(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
We use internal kbuild rules to avoid the "is up to date" message from make
arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c
$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
$(call if_changed_dep,cc_s_c)
$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE $(call filechk,offsets,ASM_OFFSETS_H)
4) Check for missing system calls
always += missing-syscalls targets += 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) Check atomic headers are up-to-date
always += old-atomics targets += old-atomics
quiet_cmd_atomics = CALL $< cmd_atomics = $(CONFIG_SHELL) scripts/atomic/check-atomics.sh
old-atomics: scripts/atomic/check-atomics.sh FORCE $(call cmd,atomics)
6) Generate constants for Python GDB integration
extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) @$(MAKE) $(build)=scripts/gdb/linux $@
Keep these three files during make clean
no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)