| /* 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 size_t), 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) (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") |
| |
| #endif /* _LINUX_BUILD_BUG_H */ |