Commit bb29b957eaaa for kernel
commit bb29b957eaaa15be33243550d9ee576c2d601669
Merge: 12d5fc96ebbb 997208ce9f43
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed Oct 21 10:45:44 2026 -1000
Merge tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux
Pull Kbuild / Kconfig updates from Nathan Chancellor:
"Kbuild:
- Suppress compiler flags in debug info for external module builds
- Use '-fmacro-prefix-map' in more places in the build
- Merge initial set of changes from Lorenzo's speed up series, along
with some fixes found through testing:
- Avoid allocating .modinfo in vmlinux
- Speed up kallsyms by indexing symbols by token and outputting
binary data to disk directly then including in assembly via
.incbin
- Don't sort $(NM) output when unnecessary
- Only emit relocations on the final vmlinx link
- Reimplement mksysmap in C
- Move many cc-option and ld-option calls into the Kconfig stage to
cache their results
- Use pigz for gzip compression when available
- Move gen_init_cpio and gen_initramfs.sh from usr/ to scripts/
- Add a TOML configuration to scripts/container and update
documentation accordingly
- Add a generic, opt-in mechanism for checking that headers can
compile standalone
- Update machine function splitting argument for LLVM 24 rename in
AutoFDO build
- Miscellaneous minor clean ups, fixes, and hardening, mostly
found/fixed via LLMs
Kconfig:
- Turn recursive ranges into an error
- Fix savedefconfig for defaults that were adjusted for being out of
range and revert a previously applied workaround
- Improvements and hardening around integer and hexadecimal values
- Emit a warning when selecting or implying a choice symbol, which
has no effect
- Emit a warning when KCONFIG_PROBABILITY is malformed
- Introduce def_string / def_int / def_hex to mirror the existing
def_bool / def_tristate to succinctly set a value and type at the
same time.
- Add cc-option-str and ld-option-str macros to act like Kbuild's
cc-option and ld-option, returning the string when the option is
supported, allowing many checks to be moved into Kconfig
- Minor usability improvements to Kconfig tests"
* tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (59 commits)
kbuild: AutoFDO: Update split machine function argument for upstream rename
kbuild: Mark the initcall ordering recipe as recursive
kbuild: Mark the gzip recipes as recursive
localmodconfig: Explicitly report boolean configs during integrity check
scripts/make_fit: Ignore schema checks when decomposing DTBs
clang-tools: Import os for broken pipe handling
kconfig: use the value argument in sym_get_near_range_bound()
kconfig: fix infinite loop in conf_choice() when no choice value is visible
kconfig: cleanup stale comment about 'keys' array
kconfig: Improve ergonomics around disabling warnings with cc-option
scripts/Kconfig.toolchain: Drop compiler symbols from dependencies
checkkconfigsymbols.py: Parse Git status output line by line
gen_init_cpio: stop parsing on lines with a missing argument list
.gitignore: drop Module.markers
.gitignore: ignore pacman package signatures
kbuild: add header check facility as a manually run static analyzer
Documentation: dev-tools: refer to user ID rather than id
Documentation: dev-tools: update container.rst with config file
scripts: add TOML config to container tool
kconfig: tests: {old,save}defconfig: Forward dynamic keyword arguments
...
diff --cc arch/alpha/boot/compressed/Makefile
index 692a29588aad,000000000000..eb930f01b4be
mode 100644,000000..100644
--- a/arch/alpha/boot/compressed/Makefile
+++ b/arch/alpha/boot/compressed/Makefile
@@@ -1,89 -1,0 +1,89 @@@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Create a self-extracting compressed vmlinux image from the original
+# vmlinux. aboot loads and enters it like a plain vmlinux.
+#
+
+OBJECTS := head.o misc.o trampoline.o piggy.o
+OBJECTS += memcpy.o memmove.o memset.o
+OBJECTS += __divqu.o __remqu.o __divlu.o __remlu.o
+targets := vmlinux.lds vmlinux vmlinux.bin
+targets += vmlinux.bin.bz2 vmlinux.bin.gz vmlinux.bin.lz4
+targets += vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.xz
+targets += vmlinux.bin.zst
+targets += $(OBJECTS)
+
+# The stub runs before the kernel has identified the CPU it booted on, so
+# build it for the base Alpha instruction set rather than inheriting the
+# kernel's -mcpu=.
+KBUILD_CFLAGS := -D__KERNEL__ -std=gnu11 -Os -fno-strict-aliasing
+KBUILD_CFLAGS += -fno-PIE -ffreestanding -fno-stack-protector
+KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
+KBUILD_CFLAGS += -pipe -mcpu=ev4 -mno-fp-regs -ffixed-8
+KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING -D__DISABLE_EXPORTS
+KBUILD_CFLAGS += $(CC_FLAGS_DIALECT)
+KBUILD_AFLAGS := -D__ASSEMBLY__ $(KBUILD_CFLAGS)
+
+# The stub has no sanitizer or coverage runtime. arch/alpha/lib/lib.a is
+# built with the kernel's instrumentation and -mcpu=, so build private
+# copies of the library routines the stub needs instead of linking it.
+UBSAN_SANITIZE := n
+GCOV_PROFILE := n
+
+$(obj)/memcpy.o: $(srctree)/arch/alpha/lib/memcpy.c FORCE
+ $(call if_changed_dep,cc_o_c)
+
+$(obj)/memmove.o: $(srctree)/arch/alpha/lib/memmove.S FORCE
+ $(call if_changed_dep,as_o_S)
+
+$(obj)/memset.o: $(srctree)/arch/alpha/lib/memset.S FORCE
+ $(call if_changed_dep,as_o_S)
+
+AFLAGS___divqu.o := -DDIV
+AFLAGS___remqu.o := -DREM
+AFLAGS___divlu.o := -DDIV -DINTSIZE
+AFLAGS___remlu.o := -DREM -DINTSIZE
+
+$(addprefix $(obj)/,__divqu.o __remqu.o __divlu.o __remlu.o): $(srctree)/arch/alpha/lib/divide.S FORCE
+ $(call if_changed_dep,as_o_S)
+
+# zstd's decompressor uses __builtin_ctzll()/__builtin_clzll(). Those are
+# inline code only with the CIX extension, which the base instruction set
+# the stub is built for does not have, so they become calls to libgcc's
+# __ctzdi2/__clzdi2.
+LIBGCC := $(shell $(CC) -print-libgcc-file-name)
+
+LDFLAGS_vmlinux := -X --orphan-handling=warn -T
+$(obj)/vmlinux: $(obj)/vmlinux.lds $(addprefix $(obj)/, $(OBJECTS)) $(LIBGCC) FORCE
+ $(call if_changed,ld)
+
+OBJCOPYFLAGS_vmlinux.bin := -R .comment -R .note -S
+$(obj)/vmlinux.bin: vmlinux FORCE
+ $(call if_changed,objcopy)
+
+suffix-$(CONFIG_KERNEL_BZIP2) := bz2
+suffix-$(CONFIG_KERNEL_GZIP) := gz
+suffix-$(CONFIG_KERNEL_LZ4) := lz4
+suffix-$(CONFIG_KERNEL_LZMA) := lzma
+suffix-$(CONFIG_KERNEL_LZO) := lzo
+suffix-$(CONFIG_KERNEL_XZ) := xz
+suffix-$(CONFIG_KERNEL_ZSTD) := zst
+
+$(obj)/vmlinux.bin.bz2: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,bzip2_with_size)
+$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
- $(call if_changed,gzip)
++ +$(call if_changed,gzip)
+$(obj)/vmlinux.bin.lz4: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,lz4_with_size)
+$(obj)/vmlinux.bin.lzma: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,lzma_with_size)
+$(obj)/vmlinux.bin.lzo: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,lzo_with_size)
+$(obj)/vmlinux.bin.xz: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,xzkern_with_size)
+$(obj)/vmlinux.bin.zst: $(obj)/vmlinux.bin FORCE
+ $(call if_changed,zstd22_with_size)
+
+LDFLAGS_piggy.o := -r --format binary --oformat elf64-alpha -T
+$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE
+ $(call if_changed,ld)
diff --cc scripts/Kconfig.toolchain
index 000000000000,254393d4f98a..4b962831d62a
mode 000000,100644..100644
--- a/scripts/Kconfig.toolchain
+++ b/scripts/Kconfig.toolchain
@@@ -1,0 -1,272 +1,274 @@@
+ # SPDX-License-Identifier: GPL-2.0-only
+ config CC_VERSION_TEXT
+ string
+ default "$(CC_VERSION_TEXT)"
+ help
+ This is used in unclear ways:
+
+ - Re-run Kconfig when the compiler is updated
+ The 'default' property references the environment variable,
+ CC_VERSION_TEXT so it is recorded in include/config/auto.conf.cmd.
+ When the compiler is updated, Kconfig will be invoked.
+
+ - Ensure full rebuild when the compiler is updated
+ include/linux/compiler-version.h contains this option in the comment
+ line so fixdep adds include/config/CC_VERSION_TEXT into the
+ auto-generated dependency. When the compiler is updated, syncconfig
+ will touch it and then every file will be rebuilt.
+
+ config CC_IS_GCC
+ def_bool $(success,test "$(cc-name)" = GCC)
+
+ config GCC_VERSION
+ int
+ default $(cc-version) if CC_IS_GCC
+ default 0
+
+ config CC_IS_CLANG
+ def_bool $(success,test "$(cc-name)" = Clang)
+
+ config CLANG_VERSION
+ int
+ default $(cc-version) if CC_IS_CLANG
+ default 0
+
+ config AS_IS_GNU
+ def_bool $(success,test "$(as-name)" = GNU)
+
+ config AS_IS_LLVM
+ def_bool $(success,test "$(as-name)" = LLVM)
+
+ config AS_VERSION
+ int
+ # Use clang version if this is the integrated assembler
+ default CLANG_VERSION if AS_IS_LLVM
+ default $(as-version)
+
+ config LD_IS_BFD
+ def_bool $(success,test "$(ld-name)" = BFD)
+
+ config LD_VERSION
+ int
+ default $(ld-version) if LD_IS_BFD
+ default 0
+
+ config LD_IS_LLD
+ def_bool $(success,test "$(ld-name)" = LLD)
+
+ config LLD_VERSION
+ int
+ default $(ld-version) if LD_IS_LLD
+ default 0
+
+ config RUSTC_VERSION
+ int
+ default $(rustc-version)
+ help
+ It does not depend on `RUST` since that one may need to use the version
+ in a `depends on`.
+
+ config RUST_IS_AVAILABLE
+ def_bool $(success,$(srctree)/scripts/rust_is_available.sh)
+ help
+ This shows whether a suitable Rust toolchain is available (found).
+
+ Please see Documentation/rust/quick-start.rst for instructions on how
+ to satisfy the build requirements of Rust support.
+
+ In particular, the Makefile target 'rustavailable' is useful to check
+ why the Rust toolchain is not being detected.
+
+ config RUSTC_LLVM_VERSION
+ int
+ default $(rustc-llvm-version)
+
+ config RUSTC_LLVM_MAJOR_VERSION
+ int
+ default $(shell,expr $(rustc-llvm-version) / 10000)
+
+ config RUSTC_CLANG_LLVM_COMPATIBLE
+ bool
+ default y if CC_IS_CLANG && RUSTC_LLVM_MAJOR_VERSION = $(shell,expr $(cc-version) / 10000)
+ help
+ This indicates whether Rust and Clang use LLVM of the same major
+ version.
+
+ Operations involving handling LLVM IR or bitcode (e.g. cross-language
+ LTO) require the same LLVM major version to work properly. For best
+ compatibility it is recommended that the exact same LLVM is used.
+
+ config ARCH_HAS_CC_CAN_LINK
+ bool
+
+ config CC_CAN_LINK
+ bool
+ default ARCH_CC_CAN_LINK if ARCH_HAS_CC_CAN_LINK
+ default $(cc_can_link_user,$(m64-flag)) if 64BIT
+ default $(cc_can_link_user,$(m32-flag))
+
+ # Fixed in GCC 14, 13.3, 12.4 and 11.5
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921
+ config GCC_ASM_GOTO_OUTPUT_BROKEN
+ bool
+ depends on CC_IS_GCC
+ default y if GCC_VERSION < 110500
+ default y if GCC_VERSION >= 120000 && GCC_VERSION < 120400
+ default y if GCC_VERSION >= 130000 && GCC_VERSION < 130300
+
+ config CC_HAS_ASM_GOTO_OUTPUT
+ def_bool y
+ depends on !GCC_ASM_GOTO_OUTPUT_BROKEN
+ depends on $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
+
+ config CC_HAS_ASM_GOTO_TIED_OUTPUT
+ depends on CC_HAS_ASM_GOTO_OUTPUT
+ # Detect buggy gcc and clang, fixed in gcc-11 clang-14.
+ def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
+
+ config TOOLS_SUPPORT_RELR
+ def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
+
+ config CC_HAS_ASM_INLINE
+ def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
+
+ config CC_HAS_ASSUME
+ bool
+ # clang needs to be at least 19.1.0 since the meaning of the assume
+ # attribute changed:
+ # https://github.com/llvm/llvm-project/commit/c44fa3e8a9a44c2e9a575768a3c185354b9f6c17
+ default y if CC_IS_CLANG && CLANG_VERSION >= 190100
+ # supported since gcc 13.1.0
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106654
+ default y if CC_IS_GCC && GCC_VERSION >= 130100
+
+ config CC_HAS_NO_PROFILE_FN_ATTR
+ def_bool $(success,echo '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
+
+ config CC_OPT_ZERO_INIT_PADDING_BITS
+ def_string "$(cc-option-str,-fzero-init-padding-bits=all)"
+
+ config CC_OPT_NO_ADDRSIG
+ def_string "$(cc-option-str,-fno-addrsig)"
+
+ config CC_OPT_DIAGNOSTICS_SHOW_CONTEXT
+ def_string "$(cc-option-str,-fdiagnostics-show-context=2)"
+
+ config CC_OPT_DIAGNOSTICS_SHOW_INLINING_CHAIN
+ def_string "$(cc-option-str,-fdiagnostics-show-inlining-chain)"
+
+ config CC_OPT_STRICT_FLEX_ARRAYS
+ def_string "$(cc-option-str,-fstrict-flex-arrays=3)"
+
+ # gcc-10 renamed --param=allow-store-data-races=0 to -fno-allow-store-data-races
+ config CC_OPT_ALLOW_STORE_DATA_RACES_PARAM
+ def_string "$(cc-option-str,--param=allow-store-data-races=0)"
+
+ config CC_OPT_NO_ALLOW_STORE_DATA_RACES
+ def_string "$(cc-option-str,-fno-allow-store-data-races)"
+
+ config CC_HAS_MNOP_MCOUNT
+ def_bool $(cc-option,-mnop-mcount)
+
+ # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
+ config CC_HAS_MFENTRY
+ def_bool $(cc-option,-mfentry)
+
+ config LD_OPT_FORCE_GROUP_ALLOCATION
+ def_string "$(ld-option-str,--force-group-allocation)"
+
+ config LD_OPT_NO_WARN_RWX_SEGMENTS
+ def_string "$(ld-option-str,--no-warn-rwx-segments)"
+
+ config CC_OPT_WNO_ADDRESS_OF_PACKED_MEMBER
+ def_string "$(cc-option-str,-Wno-address-of-packed-member)"
+
+ config CC_OPT_WNO_FORMAT_OVERFLOW_NON_KPRINTF
+ def_string "$(cc-option-str,-Wno-format-overflow-non-kprintf)"
+
+ config CC_OPT_WNO_FORMAT_TRUNCATION_NON_KPRINTF
+ def_string "$(cc-option-str,-Wno-format-truncation-non-kprintf)"
+
+ config CC_OPT_WNO_DEFAULT_CONST_INIT_UNSAFE
+ def_string "$(cc-option-str,-Wno-default-const-init-unsafe)"
+
+ config CC_OPT_WNO_DANGLING_POINTER
+ def_string "$(cc-option-str,-Wno-dangling-pointer)"
+
+ config CC_OPT_WVLA_LARGER_THAN
+ def_string "$(cc-option-str,-Wvla-larger-than=1)"
+
+ config CC_HAS_WSTRINGOP_OVERFLOW
+ def_bool $(cc-option,-Wstringop-overflow)
+
+ config CC_OPT_WNO_UNTERMINATED_STRING_INITIALIZATION
+ def_string "$(cc-option-str,-Wno-unterminated-string-initialization)"
+
+ config CC_OPT_WERROR_DESIGNATED_INIT
+ def_string "$(cc-option-str,-Werror=designated-init)"
+
+ config CC_OPT_WENUM_CONVERSION
+ def_string "$(cc-option-str,-Wenum-conversion)"
+
+ config CC_OPT_WNO_PACKED_NOT_ALIGNED
+ def_string "$(cc-option-str,-Wno-packed-not-aligned)"
+
+ config CC_OPT_WNO_FORMAT_OVERFLOW
+ def_string "$(cc-option-str,-Wno-format-overflow)"
+
+ config CC_OPT_WNO_STRINGOP_TRUNCATION
+ def_string "$(cc-option-str,-Wno-stringop-truncation)"
+
+ config CC_HAS_COUNTED_BY
+ bool
+ # clang needs to be at least 20.1.0 to avoid potential crashes
+ # when building structures that contain __counted_by
+ # https://github.com/ClangBuiltLinux/linux/issues/2114
+ # https://github.com/llvm/llvm-project/commit/160fb1121cdf703c3ef5e61fb26c5659eb581489
+ default y if CC_IS_CLANG && CLANG_VERSION >= 200100
+ # supported since gcc 15.1.0
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896
+ default y if CC_IS_GCC && GCC_VERSION >= 150100
+
+ config CC_HAS_COUNTED_BY_PTR
+ bool
+ # supported since clang 22
+ default y if CC_IS_CLANG && CLANG_VERSION >= 220100
+ # supported since gcc 16.0.0
+ default y if CC_IS_GCC && GCC_VERSION >= 160000
+
+ config CC_HAS_BROKEN_COUNTED_BY_REF
+ bool
+ # https://github.com/llvm/llvm-project/issues/182575
+ default y if CC_IS_CLANG && CLANG_VERSION < 220100
+
+ config CC_HAS_ALLOC_TOKEN
+ def_bool $(cc-option,-falloc-token-max=123)
+
+ config CC_HAS_MULTIDIMENSIONAL_NONSTRING
+ def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror)
+
++config CC_OPT_INLINE_MEMSET
++ string
++ default "-finline-stringops=memset" if $(cc-option,-finline-stringops=memset)
++ default "-mllvm -max-store-memset=4294967294" if $(cc-option,-mllvm -max-store-memset=4294967294)
++
+ config LD_CAN_USE_KEEP_IN_OVERLAY
+ # ld.lld prior to 21.0.0 did not support KEEP within an overlay description
+ # https://github.com/llvm/llvm-project/pull/130661
+ def_bool LD_IS_BFD || LLD_VERSION >= 210000
+
-config RUSTC_HAS_SPAN_FILE
- def_bool RUSTC_VERSION >= 108800
-
+ config RUSTC_HAS_UNNECESSARY_TRANSMUTES
+ def_bool RUSTC_VERSION >= 108800
+
+ config RUSTC_HAS_FILE_WITH_NUL
+ def_bool RUSTC_VERSION >= 108900
+
+ config RUSTC_HAS_FILE_AS_C_STR
+ def_bool RUSTC_VERSION >= 109100
+
+ config RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS
+ def_bool RUSTC_VERSION >= 109800
+
+ config PAHOLE_VERSION
+ int
+ default "$(PAHOLE_VERSION)"
diff --cc scripts/remove-stale-files
index f1f776caae00,e46337e4bfb8..70a2ead4d0f1
--- a/scripts/remove-stale-files
+++ b/scripts/remove-stale-files
@@@ -27,4 -27,4 +27,6 @@@ rm -f *.spe
rm -f lib/test_fortify.log
+rm -f rust/doctests_kernel_generated_kunit.c
++
+ rm -f usr/gen_init_cpio