mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-07-08 18:13:59 +02:00
Peter Zijlstra
f550466949
[ Upstream commit 54da6a0924 ]
Use __attribute__((__cleanup__(func))) to build:
- simple auto-release pointers using __free()
- 'classes' with constructor and destructor semantics for
scope-based resource management.
- lock guards based on the above classes.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230612093537.614161713%40infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_COMPILER_TYPES_H
|
|
#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
|
|
#endif
|
|
|
|
/* Compiler specific definitions for Clang compiler */
|
|
|
|
/*
|
|
* Clang prior to 17 is being silly and considers many __cleanup() variables
|
|
* as unused (because they are, their sole purpose is to go out of scope).
|
|
*
|
|
* https://reviews.llvm.org/D152180
|
|
*/
|
|
#undef __cleanup
|
|
#define __cleanup(func) __maybe_unused __attribute__((__cleanup__(func)))
|
|
|
|
/* same as gcc, this was present in clang-2.6 so we can assume it works
|
|
* with any version that can compile the kernel
|
|
*/
|
|
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
|
|
|
|
/* all clang versions usable with the kernel support KASAN ABI version 5 */
|
|
#define KASAN_ABI_VERSION 5
|
|
|
|
/*
|
|
* Clang 22 added preprocessor macros to match GCC, in hopes of eventually
|
|
* dropping __has_feature support for sanitizers:
|
|
* https://github.com/llvm/llvm-project/commit/568c23bbd3303518c5056d7f03444dae4fdc8a9c
|
|
* Create these macros for older versions of clang so that it is easy to clean
|
|
* up once the minimum supported version of LLVM for building the kernel always
|
|
* creates these macros.
|
|
*
|
|
* Note: Checking __has_feature(*_sanitizer) is only true if the feature is
|
|
* enabled. Therefore it is not required to additionally check defined(CONFIG_*)
|
|
* to avoid adding redundant attributes in other configurations.
|
|
*/
|
|
#if __has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__)
|
|
#define __SANITIZE_ADDRESS__
|
|
#endif
|
|
#if __has_feature(hwaddress_sanitizer) && !defined(__SANITIZE_HWADDRESS__)
|
|
#define __SANITIZE_HWADDRESS__
|
|
#endif
|
|
#if __has_feature(thread_sanitizer) && !defined(__SANITIZE_THREAD__)
|
|
#define __SANITIZE_THREAD__
|
|
#endif
|
|
|
|
/*
|
|
* Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel.
|
|
*/
|
|
#ifdef __SANITIZE_HWADDRESS__
|
|
#define __SANITIZE_ADDRESS__
|
|
#endif
|
|
|
|
#ifdef __SANITIZE_ADDRESS__
|
|
#define __no_sanitize_address \
|
|
__attribute__((no_sanitize("address", "hwaddress")))
|
|
#else
|
|
#define __no_sanitize_address
|
|
#endif
|
|
|
|
#ifdef __SANITIZE_THREAD__
|
|
#define __no_sanitize_thread \
|
|
__attribute__((no_sanitize("thread")))
|
|
#else
|
|
#define __no_sanitize_thread
|
|
#endif
|
|
|
|
#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
|
|
#define __HAVE_BUILTIN_BSWAP32__
|
|
#define __HAVE_BUILTIN_BSWAP64__
|
|
#define __HAVE_BUILTIN_BSWAP16__
|
|
#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
|
|
|
|
#if __has_feature(undefined_behavior_sanitizer)
|
|
/* GCC does not have __SANITIZE_UNDEFINED__ */
|
|
#define __no_sanitize_undefined \
|
|
__attribute__((no_sanitize("undefined")))
|
|
#else
|
|
#define __no_sanitize_undefined
|
|
#endif
|
|
|
|
/*
|
|
* Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
|
|
* with no_sanitize("coverage"). Prior versions of Clang support coverage
|
|
* instrumentation, but cannot be queried for support by the preprocessor.
|
|
*/
|
|
#if __has_feature(coverage_sanitizer)
|
|
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
|
|
#else
|
|
#define __no_sanitize_coverage
|
|
#endif
|
|
|
|
#if __has_feature(shadow_call_stack)
|
|
# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
|
|
#endif
|
|
|
|
#define __nocfi __attribute__((__no_sanitize__("cfi")))
|
|
#define __cficanonical __attribute__((__cfi_canonical_jump_table__))
|