Kbuild

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