mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 19:45:07 +07:00
e3698b23ec
To pick up the changes in these csets:295bcca849("linux/bits.h: add compile time sanity check of GENMASK inputs")3945ff37d2("linux/bits.h: Extract common header for vDSO") To address this tools/perf build warning: Warning: Kernel ABI header at 'tools/include/linux/bits.h' differs from latest version at 'include/linux/bits.h' diff -u tools/include/linux/bits.h include/linux/bits.h This clashes with usage of userspace's static_assert(), that, at least on glibc, is guarded by a ifnded/endif pair, do the same to our copy of build_bug.h and avoid that diff in check_headers.sh so that we continue checking for drifts with the kernel sources master copy. This will all be tested with the set of build containers that includes uCLibc, musl libc, lots of glibc versions in lots of distros and cross build environments. The tools/objtool, tools/bpf, etc were tested as well. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Rikard Falkeborn <rikard.falkeborn@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_BUILD_BUG_H
|
|
#define _LINUX_BUILD_BUG_H
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#ifdef __CHECKER__
|
|
#define BUILD_BUG_ON_ZERO(e) (0)
|
|
#else /* __CHECKER__ */
|
|
/*
|
|
* Force a compilation error if condition is true, but also produce a
|
|
* result (of value 0 and type int), so the expression can be used
|
|
* e.g. in a structure initializer (or where-ever else comma expressions
|
|
* aren't permitted).
|
|
*/
|
|
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
|
|
#endif /* __CHECKER__ */
|
|
|
|
/* Force a compilation error if a constant expression is not a power of 2 */
|
|
#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \
|
|
BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
|
|
#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
|
|
BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
|
|
|
|
/*
|
|
* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
|
|
* expression but avoids the generation of any code, even if that expression
|
|
* has side-effects.
|
|
*/
|
|
#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
|
|
|
|
/**
|
|
* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
|
|
* error message.
|
|
* @condition: the condition which the compiler should know is false.
|
|
*
|
|
* See BUILD_BUG_ON for description.
|
|
*/
|
|
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
|
|
|
|
/**
|
|
* BUILD_BUG_ON - break compile if a condition is true.
|
|
* @condition: the condition which the compiler should know is false.
|
|
*
|
|
* If you have some code which relies on certain constants being equal, or
|
|
* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
|
|
* detect if someone changes it.
|
|
*/
|
|
#define BUILD_BUG_ON(condition) \
|
|
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
|
|
|
|
/**
|
|
* BUILD_BUG - break compile if used.
|
|
*
|
|
* If you have some code that you expect the compiler to eliminate at
|
|
* build time, you should use BUILD_BUG to detect if it is
|
|
* unexpectedly used.
|
|
*/
|
|
#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
|
|
|
|
/**
|
|
* static_assert - check integer constant expression at build time
|
|
*
|
|
* static_assert() is a wrapper for the C11 _Static_assert, with a
|
|
* little macro magic to make the message optional (defaulting to the
|
|
* stringification of the tested expression).
|
|
*
|
|
* Contrary to BUILD_BUG_ON(), static_assert() can be used at global
|
|
* scope, but requires the expression to be an integer constant
|
|
* expression (i.e., it is not enough that __builtin_constant_p() is
|
|
* true for expr).
|
|
*
|
|
* Also note that BUILD_BUG_ON() fails the build if the condition is
|
|
* true, while static_assert() fails the build if the expression is
|
|
* false.
|
|
*/
|
|
#ifndef static_assert
|
|
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
|
|
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
|
|
#endif // static_assert
|
|
|
|
#endif /* _LINUX_BUILD_BUG_H */
|