xref: /linux/Kbuild (revision 6c7340a7a8d2b6ecad1ad108f6daa73ba1dc082f)
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
10bounds-file := include/generated/bounds.h
11
12targets := kernel/bounds.s
13
14$(bounds-file): kernel/bounds.s FORCE
15	$(call filechk,offsets,__LINUX_BOUNDS_H__)
16
17# Generate timeconst.h
18
19timeconst-file := include/generated/timeconst.h
20
21filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
22
23$(timeconst-file): kernel/time/timeconst.bc FORCE
24	$(call filechk,gentimeconst)
25
26# Generate asm-offsets.h
27
28offsets-file := include/generated/asm-offsets.h
29
30targets += arch/$(SRCARCH)/kernel/asm-offsets.s
31
32arch/$(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# Generate rq-offsets.h
38
39rq-offsets-file := include/generated/rq-offsets.h
40
41targets += kernel/sched/rq-offsets.s
42
43kernel/sched/rq-offsets.s: $(offsets-file)
44
45$(rq-offsets-file): kernel/sched/rq-offsets.s FORCE
46	$(call filechk,offsets,__RQ_OFFSETS_H__)
47
48# Check for missing system calls
49
50quiet_cmd_syscalls = CALL    $<
51      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
52
53PHONY += missing-syscalls
54missing-syscalls: scripts/checksyscalls.sh $(rq-offsets-file)
55	$(call cmd,syscalls)
56
57# Check the manual modification of atomic headers
58
59quiet_cmd_check_sha1 = CHKSHA1 $<
60      cmd_check_sha1 = \
61	if ! command -v sha1sum >/dev/null; then \
62		echo "warning: cannot check the header due to sha1sum missing"; \
63		exit 0; \
64	fi; \
65	if [ "$$(sed -n '$$s:// ::p' $<)" != \
66	     "$$(sed '$$d' $< | sha1sum | sed 's/ .*//')" ]; then \
67		echo "error: $< has been modified." >&2; \
68		exit 1; \
69	fi; \
70	touch $@
71
72atomic-checks += $(addprefix $(obj)/.checked-, \
73	  atomic-arch-fallback.h \
74	  atomic-instrumented.h \
75	  atomic-long.h)
76
77targets += $(atomic-checks)
78$(atomic-checks): $(obj)/.checked-%: include/linux/atomic/%  FORCE
79	$(call if_changed,check_sha1)
80
81# A phony target that depends on all the preparation targets
82
83PHONY += prepare
84prepare: $(offsets-file) missing-syscalls $(atomic-checks)
85	@:
86
87# Ordinary directory descending
88# ---------------------------------------------------------------------------
89
90obj-y			+= init/
91obj-y			+= usr/
92obj-y			+= arch/$(SRCARCH)/
93obj-y			+= $(ARCH_CORE)
94obj-y			+= kernel/
95obj-y			+= certs/
96obj-y			+= mm/
97obj-y			+= fs/
98obj-y			+= ipc/
99obj-y			+= security/
100obj-y			+= crypto/
101obj-$(CONFIG_BLOCK)	+= block/
102obj-$(CONFIG_IO_URING)	+= io_uring/
103obj-$(CONFIG_RUST)	+= rust/
104obj-y			+= $(ARCH_LIB)
105obj-y			+= drivers/
106obj-y			+= sound/
107obj-$(CONFIG_SAMPLES)	+= samples/
108obj-$(CONFIG_NET)	+= net/
109obj-y			+= virt/
110obj-y			+= $(ARCH_DRIVERS)
111obj-$(CONFIG_DRM_HEADER_TEST)	+= include/
112