diff options
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 3b6949b41745..8287a72bb6a9 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -36,9 +36,7 @@ extern void __chk_io_ptr(const void __iomem *); #ifdef __KERNEL__ -#if __GNUC__ > 4 -#error no compiler-gcc.h file for this gcc version -#elif __GNUC__ == 4 +#if __GNUC__ >= 4 # include <linux/compiler-gcc4.h> #elif __GNUC__ == 3 && __GNUC_MINOR__ >= 2 # include <linux/compiler-gcc3.h> @@ -108,15 +106,30 @@ extern void __chk_io_ptr(const void __iomem *); * Allow us to avoid 'defined but not used' warnings on functions and data, * as well as force them to be emitted to the assembly file. * - * As of gcc 3.3, static functions that are not marked with attribute((used)) - * may be elided from the assembly file. As of gcc 3.3, static data not so + * As of gcc 3.4, static functions that are not marked with attribute((used)) + * may be elided from the assembly file. As of gcc 3.4, static data not so * marked will not be elided, but this may change in a future gcc version. * + * NOTE: Because distributions shipped with a backported unit-at-a-time + * compiler in gcc 3.3, we must define __used to be __attribute__((used)) + * for gcc >=3.3 instead of 3.4. + * * In prior versions of gcc, such functions and data would be emitted, but * would be warned about except with attribute((unused)). + * + * Mark functions that are referenced only in inline assembly as __used so + * the code is emitted even though it appears to be unreferenced. */ #ifndef __attribute_used__ -# define __attribute_used__ /* unimplemented */ +# define __attribute_used__ /* deprecated */ +#endif + +#ifndef __used +# define __used /* unimplemented */ +#endif + +#ifndef __maybe_unused +# define __maybe_unused /* unimplemented */ #endif /* |