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-rw-r--r--Kbuild99
1 files changed, 99 insertions, 0 deletions
diff --git a/Kbuild b/Kbuild
new file mode 100644
index 000000000..464b34a08
--- /dev/null
+++ b/Kbuild
@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Kbuild for top-level directory of the kernel
+
+# Prepare global headers and check sanity before descending into sub-directories
+# ---------------------------------------------------------------------------
+
+# Generate bounds.h
+
+bounds-file := include/generated/bounds.h
+
+targets := kernel/bounds.s
+
+$(bounds-file): kernel/bounds.s FORCE
+ $(call filechk,offsets,__LINUX_BOUNDS_H__)
+
+# Generate timeconst.h
+
+timeconst-file := include/generated/timeconst.h
+
+filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
+
+$(timeconst-file): kernel/time/timeconst.bc FORCE
+ $(call filechk,gentimeconst)
+
+# Generate asm-offsets.h
+
+offsets-file := include/generated/asm-offsets.h
+
+targets += arch/$(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__)
+
+# Check for missing system calls
+
+quiet_cmd_syscalls = CALL $<
+ cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
+
+PHONY += missing-syscalls
+missing-syscalls: scripts/checksyscalls.sh $(offsets-file)
+ $(call cmd,syscalls)
+
+# Check the manual modification of atomic headers
+
+quiet_cmd_check_sha1 = CHKSHA1 $<
+ cmd_check_sha1 = \
+ if ! command -v sha1sum >/dev/null; then \
+ echo "warning: cannot check the header due to sha1sum missing"; \
+ exit 0; \
+ fi; \
+ if [ "$$(sed -n '$$s:// ::p' $<)" != \
+ "$$(sed '$$d' $< | sha1sum | sed 's/ .*//')" ]; then \
+ echo "error: $< has been modified." >&2; \
+ exit 1; \
+ fi; \
+ touch $@
+
+atomic-checks += $(addprefix $(obj)/.checked-, \
+ atomic-arch-fallback.h \
+ atomic-instrumented.h \
+ atomic-long.h)
+
+targets += $(atomic-checks)
+$(atomic-checks): $(obj)/.checked-%: include/linux/atomic/% FORCE
+ $(call if_changed,check_sha1)
+
+# A phony target that depends on all the preparation targets
+
+PHONY += prepare
+prepare: $(offsets-file) missing-syscalls $(atomic-checks)
+ @:
+
+# Ordinary directory descending
+# ---------------------------------------------------------------------------
+
+obj-y += init/
+obj-y += usr/
+obj-y += arch/$(SRCARCH)/
+obj-y += $(ARCH_CORE)
+obj-y += kernel/
+obj-y += certs/
+obj-y += mm/
+obj-y += fs/
+obj-y += ipc/
+obj-y += security/
+obj-y += crypto/
+obj-$(CONFIG_BLOCK) += block/
+obj-$(CONFIG_IO_URING) += io_uring/
+obj-$(CONFIG_RUST) += rust/
+obj-y += $(ARCH_LIB)
+obj-y += drivers/
+obj-y += sound/
+obj-$(CONFIG_SAMPLES) += samples/
+obj-$(CONFIG_NET) += net/
+obj-y += virt/
+obj-y += $(ARCH_DRIVERS)