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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-04-14 16:37:29 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-04-14 16:39:28 +0200 |
| commit | 5b992add7d32d3106f121c85ad99d2986dc3b8e6 (patch) | |
| tree | a46a13cbe3a722dd0c9d6e6065d4762fc3b56544 | |
| parent | tools headers: Update x86's syscall_64.tbl with the kernel sources (diff) | |
| download | linux-5b992add7d32d3106f121c85ad99d2986dc3b8e6.tar.xz linux-5b992add7d32d3106f121c85ad99d2986dc3b8e6.zip | |
tools headers: Adopt verbatim copy of compiletime_assert() from kernel sources
Will be needed when syncing the linux/bits.h header, in the next cset.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/include/linux/compiler.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index 1827c2f973f9..180f7714a5f1 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -10,6 +10,32 @@ # define __compiletime_error(message) #endif +#ifdef __OPTIMIZE__ +# define __compiletime_assert(condition, msg, prefix, suffix) \ + do { \ + extern void prefix ## suffix(void) __compiletime_error(msg); \ + if (!(condition)) \ + prefix ## suffix(); \ + } while (0) +#else +# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0) +#endif + +#define _compiletime_assert(condition, msg, prefix, suffix) \ + __compiletime_assert(condition, msg, prefix, suffix) + +/** + * compiletime_assert - break build and emit msg if condition is false + * @condition: a compile-time constant condition to check + * @msg: a message to emit if condition is false + * + * In tradition of POSIX assert, this macro will break the build if the + * supplied condition is *false*, emitting the supplied error message if the + * compiler has support to do so. + */ +#define compiletime_assert(condition, msg) \ + _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) + /* Optimization barrier */ /* The "volatile" is due to gcc bugs */ #define barrier() __asm__ __volatile__("": : :"memory") |