mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Linus Torvalds
73f399414a
Pull Kbuild / Kconfig updates from Nathan Chancellor:
"Kbuild:
- Remove broken module linking exclusion for BTF
- Add documentation around how offset header files work
- Include unstripped vDSO libraries in pacman packages
- Bump minimum version of LLVM for building the kernel to 17.0.1 and
clean up unnecessary workarounds
- Use a context manager in run-clang-tools
- Add dist macro value if present to release tag for RPM packages
- Detect and report truncated buf_printf() output in modpost
- Add __llvm_covfun and __llvm_covmap to section whitelist in modpost
- Support Clang's distributed ThinLTO mode
- Remove architecture specific configurations for AutoFDO and
Propeller to ease individual architecture maintenance
Kconfig:
- Add kconfig-sym-check target to look for dangling Kconfig symbol
references and invalid tristate literal values
- Harden against potential NULL pointer dereference
- Fix typo in Kconfig test comment"
* tag 'kbuild-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (31 commits)
kconfig: tests: fix typo in comment
kconfig: Remove the architecture specific config for Propeller
kconfig: Remove the architecture specific config for AutoFDO
modpost: Add __llvm_covfun and __llvm_covmap to section_white_list
kconfig: add kconfig-sym-check static checker
kbuild: Remove unnecessary 'T' modifier in cmd_ar_builtin_fixup
kbuild: distributed build support for Clang ThinLTO
kbuild: move vmlinux.a build rule to scripts/Makefile.vmlinux_a
scripts: modpost: detect and report truncated buf_printf() output
kbuild: rpm-pkg: append %{?dist} macro to Release tag
run-clang-tools: run multiprocessing.Pool as context manager
compiler-clang.h: Drop explicit version number from "all" diagnostic macro
compiler-clang.h: Remove __cleanup -Wunused-variable workaround
kbuild: Remove check for broken scoping with clang < 17 in CC_HAS_ASM_GOTO_OUTPUT
x86/entry/vdso32: Remove conditional omission of '.cfi_offset eflags'
x86/module: Revert "Deal with GOT based stack cookie load on Clang < 17"
x86/build: Drop unnecessary '-ffreestanding' addition to KBUILD_CFLAGS
scripts/Makefile.warn: Drop -Wformat handling for clang < 16
riscv: Drop tautological condition from TOOLCHAIN_NEEDS_OLD_ISA_SPEC
riscv: Remove tautological condition from selection of ARCH_SUPPORTS_CFI
...
154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_COMPILER_TYPES_H
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#error "Please do not include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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/* Compiler specific definitions for Clang compiler */
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/* all clang versions usable with the kernel support KASAN ABI version 5 */
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#define KASAN_ABI_VERSION 5
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/*
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* Clang 22 added preprocessor macros to match GCC, in hopes of eventually
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* dropping __has_feature support for sanitizers:
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* https://github.com/llvm/llvm-project/commit/568c23bbd3303518c5056d7f03444dae4fdc8a9c
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* Create these macros for older versions of clang so that it is easy to clean
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* up once the minimum supported version of LLVM for building the kernel always
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* creates these macros.
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*
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* Note: Checking __has_feature(*_sanitizer) is only true if the feature is
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* enabled. Therefore it is not required to additionally check defined(CONFIG_*)
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* to avoid adding redundant attributes in other configurations.
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*/
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#if __has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__)
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#define __SANITIZE_ADDRESS__
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#endif
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#if __has_feature(hwaddress_sanitizer) && !defined(__SANITIZE_HWADDRESS__)
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#define __SANITIZE_HWADDRESS__
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#endif
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#if __has_feature(thread_sanitizer) && !defined(__SANITIZE_THREAD__)
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#define __SANITIZE_THREAD__
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#endif
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/*
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* Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel.
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*/
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#ifdef __SANITIZE_HWADDRESS__
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#define __SANITIZE_ADDRESS__
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#endif
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#ifdef __SANITIZE_ADDRESS__
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#define __no_sanitize_address \
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__attribute__((no_sanitize("address", "hwaddress")))
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#else
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#define __no_sanitize_address
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#endif
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#ifdef __SANITIZE_THREAD__
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#define __no_sanitize_thread \
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__attribute__((no_sanitize("thread")))
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#else
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#define __no_sanitize_thread
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#endif
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
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#define __HAVE_BUILTIN_BSWAP32__
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#define __HAVE_BUILTIN_BSWAP64__
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#define __HAVE_BUILTIN_BSWAP16__
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#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
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#if __has_feature(undefined_behavior_sanitizer)
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/* GCC does not have __SANITIZE_UNDEFINED__ */
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#define __no_sanitize_undefined \
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__attribute__((no_sanitize("undefined")))
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#else
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#define __no_sanitize_undefined
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#endif
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#if __has_feature(memory_sanitizer)
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#define __SANITIZE_MEMORY__
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/*
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* Unlike other sanitizers, KMSAN still inserts code into functions marked with
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* no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation
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* provides the behavior consistent with other __no_sanitize_ attributes,
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* guaranteeing that __no_sanitize_memory functions remain uninstrumented.
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*/
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#define __no_sanitize_memory __disable_sanitizer_instrumentation
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/*
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* The __no_kmsan_checks attribute ensures that a function does not produce
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* false positive reports by:
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* - initializing all local variables and memory stores in this function;
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* - skipping all shadow checks;
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* - passing initialized arguments to this function's callees.
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*/
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#define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory")))
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#else
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#define __no_sanitize_memory
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#define __no_kmsan_checks
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#endif
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/*
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* Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
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* with no_sanitize("coverage"). Prior versions of Clang support coverage
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* instrumentation, but cannot be queried for support by the preprocessor.
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*/
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#if __has_feature(coverage_sanitizer)
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#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
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#else
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#define __no_sanitize_coverage
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#endif
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/* Only Clang needs to disable the coverage sanitizer for kstack_erase. */
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#define __no_kstack_erase __no_sanitize_coverage
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#if __has_feature(shadow_call_stack)
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# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
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#endif
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/*
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* Turn individual warnings and errors on and off locally, depending
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* on version.
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*/
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#define __diag_clang(version, severity, s) \
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__diag_clang_ ## version(__diag_clang_ ## severity s)
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/* Severity used in pragma directives */
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#define __diag_clang_ignore ignored
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#define __diag_clang_warn warning
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#define __diag_clang_error error
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#define __diag_str1(s) #s
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#define __diag_str(s) __diag_str1(s)
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#define __diag(s) _Pragma(__diag_str(clang diagnostic s))
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#if CONFIG_CLANG_VERSION >= 230000
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#define __diag_clang_23(s) __diag(s)
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#else
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#define __diag_clang_23(s)
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#endif
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#define __diag_clang_all(s) __diag(s)
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#define __diag_ignore_all(option, comment) \
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__diag_clang(all, ignore, option)
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/*
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* clang has horrible behavior with "g" or "rm" constraints for asm
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* inputs, turning them into something worse than "m". Avoid using
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* constraints with multiple possible uses (but "ir" seems to be ok):
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*
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* https://github.com/llvm/llvm-project/issues/20571
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*/
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#define ASM_INPUT_G "ir"
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#define ASM_INPUT_RM "r"
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#define ASM_OUTPUT_RM "=r"
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/*
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* Declare compiler support for __typeof_unqual__() operator.
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*
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* Bindgen uses LLVM even if our C compiler is GCC, so we cannot
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* rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.
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*/
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#define CC_HAS_TYPEOF_UNQUAL (__clang_major__ > 19 || (__clang_major__ == 19 && __clang_minor__ > 0))
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