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Linux/Kbuild

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Diff markup

Differences between /Kbuild (Version linux-6.11.5) and /Kbuild (Version linux-4.10.17)


  1 # SPDX-License-Identifier: GPL-2.0             << 
  2 #                                                   1 #
  3 # Kbuild for top-level directory of the kernel      2 # Kbuild for top-level directory of the kernel
                                                   >>   3 # This file takes care of the following:
                                                   >>   4 # 1) Generate bounds.h
                                                   >>   5 # 2) Generate timeconst.h
                                                   >>   6 # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
                                                   >>   7 # 4) Check for missing system calls
                                                   >>   8 # 5) Generate constants.py (may need bounds.h)
                                                   >>   9 
                                                   >>  10 # Default sed regexp - multiline due to syntax constraints
                                                   >>  11 define sed-y
                                                   >>  12         "/^->/{s:->#\(.*\):/* \1 */:; \
                                                   >>  13         s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
                                                   >>  14         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
                                                   >>  15         s:->::; p;}"
                                                   >>  16 endef
                                                   >>  17 
                                                   >>  18 # Use filechk to avoid rebuilds when a header changes, but the resulting file
                                                   >>  19 # does not
                                                   >>  20 define filechk_offsets
                                                   >>  21         (set -e; \
                                                   >>  22          echo "#ifndef $2"; \
                                                   >>  23          echo "#define $2"; \
                                                   >>  24          echo "/*"; \
                                                   >>  25          echo " * DO NOT MODIFY."; \
                                                   >>  26          echo " *"; \
                                                   >>  27          echo " * This file was generated by Kbuild"; \
                                                   >>  28          echo " */"; \
                                                   >>  29          echo ""; \
                                                   >>  30          sed -ne $(sed-y); \
                                                   >>  31          echo ""; \
                                                   >>  32          echo "#endif" )
                                                   >>  33 endef
  4                                                    34 
  5 # Prepare global headers and check sanity befo !!  35 #####
  6 # -------------------------------------------- !!  36 # 1) Generate bounds.h
  7                                                << 
  8 # Generate bounds.h                            << 
  9                                                    37 
 10 bounds-file := include/generated/bounds.h          38 bounds-file := include/generated/bounds.h
 11                                                    39 
                                                   >>  40 always  := $(bounds-file)
 12 targets := kernel/bounds.s                         41 targets := kernel/bounds.s
 13                                                    42 
 14 $(bounds-file): kernel/bounds.s FORCE          !!  43 # We use internal kbuild rules to avoid the "is up to date" message from make
                                                   >>  44 kernel/bounds.s: kernel/bounds.c FORCE
                                                   >>  45         $(Q)mkdir -p $(dir $@)
                                                   >>  46         $(call if_changed_dep,cc_s_c)
                                                   >>  47 
                                                   >>  48 $(obj)/$(bounds-file): kernel/bounds.s FORCE
 15         $(call filechk,offsets,__LINUX_BOUNDS_     49         $(call filechk,offsets,__LINUX_BOUNDS_H__)
 16                                                    50 
 17 # Generate timeconst.h                         !!  51 #####
                                                   >>  52 # 2) Generate timeconst.h
 18                                                    53 
 19 timeconst-file := include/generated/timeconst.     54 timeconst-file := include/generated/timeconst.h
 20                                                    55 
 21 filechk_gentimeconst = echo $(CONFIG_HZ) | bc  !!  56 targets += $(timeconst-file)
                                                   >>  57 
                                                   >>  58 quiet_cmd_gentimeconst = GEN     $@
                                                   >>  59 define cmd_gentimeconst
                                                   >>  60         (echo $(CONFIG_HZ) | bc -q $< ) > $@
                                                   >>  61 endef
                                                   >>  62 define filechk_gentimeconst
                                                   >>  63         (echo $(CONFIG_HZ) | bc -q $< )
                                                   >>  64 endef
 22                                                    65 
 23 $(timeconst-file): kernel/time/timeconst.bc FO !!  66 $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
 24         $(call filechk,gentimeconst)               67         $(call filechk,gentimeconst)
 25                                                    68 
 26 # Generate asm-offsets.h                       !!  69 #####
                                                   >>  70 # 3) Generate asm-offsets.h
                                                   >>  71 #
 27                                                    72 
 28 offsets-file := include/generated/asm-offsets.     73 offsets-file := include/generated/asm-offsets.h
 29                                                    74 
                                                   >>  75 always  += $(offsets-file)
 30 targets += arch/$(SRCARCH)/kernel/asm-offsets.     76 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
 31                                                    77 
 32 arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeco !!  78 # We use internal kbuild rules to avoid the "is up to date" message from make
                                                   >>  79 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                                   >>  80                                       $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
                                                   >>  81         $(Q)mkdir -p $(dir $@)
                                                   >>  82         $(call if_changed_dep,cc_s_c)
 33                                                    83 
 34 $(offsets-file): arch/$(SRCARCH)/kernel/asm-of !!  84 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
 35         $(call filechk,offsets,__ASM_OFFSETS_H     85         $(call filechk,offsets,__ASM_OFFSETS_H__)
 36                                                    86 
 37 # Check for missing system calls               !!  87 #####
                                                   >>  88 # 4) Check for missing system calls
                                                   >>  89 #
                                                   >>  90 
                                                   >>  91 always += missing-syscalls
                                                   >>  92 targets += missing-syscalls
 38                                                    93 
 39 quiet_cmd_syscalls = CALL    $<                    94 quiet_cmd_syscalls = CALL    $<
 40       cmd_syscalls = $(CONFIG_SHELL) $< $(CC)      95       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
 41                                                    96 
 42 PHONY += missing-syscalls                      !!  97 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
 43 missing-syscalls: scripts/checksyscalls.sh $(o << 
 44         $(call cmd,syscalls)                       98         $(call cmd,syscalls)
 45                                                    99 
 46 # Check the manual modification of atomic head !! 100 #####
                                                   >> 101 # 5) Generate constants for Python GDB integration
                                                   >> 102 #
                                                   >> 103 
                                                   >> 104 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
                                                   >> 105 
                                                   >> 106 build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
                                                   >> 107         @$(MAKE) $(build)=scripts/gdb/linux $@
 47                                                   108 
 48 quiet_cmd_check_sha1 = CHKSHA1 $<              !! 109 # Keep these three files during make clean
 49       cmd_check_sha1 = \                       !! 110 no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
 50         if ! command -v sha1sum >/dev/null; th << 
 51                 echo "warning: cannot check th << 
 52                 exit 0; \                      << 
 53         fi; \                                  << 
 54         if [ "$$(sed -n '$$s:// ::p' $<)" != \ << 
 55              "$$(sed '$$d' $< | sha1sum | sed  << 
 56                 echo "error: $< has been modif << 
 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/l << 
 68         $(call if_changed,check_sha1)          << 
 69                                                << 
 70 # A phony target that depends on all the prepa << 
 71                                                << 
 72 PHONY += prepare                               << 
 73 prepare: $(offsets-file) missing-syscalls $(at << 
 74         @:                                     << 
 75                                                << 
 76 # Ordinary directory descending                << 
 77 # -------------------------------------------- << 
 78                                                << 
 79 obj-y                   += init/               << 
 80 obj-y                   += usr/                << 
 81 obj-y                   += arch/$(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)     << 
                                                      

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