diff options
| author | Linus Torvalds <torvalds@home.osdl.org> | 2003-07-08 08:55:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@home.osdl.org> | 2003-07-08 08:55:17 -0700 |
| commit | 3a185ec4544b1e487a156e97b5959f300bac130f (patch) | |
| tree | e50419465a5909602e7b70f113232481e04ff7bf /include/linux | |
| parent | e7d4d40ec0a959f76d1070d150e6efb3606c0912 (diff) | |
| parent | b84c512679ed7e0b140e1e6a9e00675005b361fd (diff) | |
Merge bk://kernel.bkbits.net/davem/net-2.5
into home.osdl.org:/home/torvalds/v2.5/linux
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/compiler.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 4ef20f517d27..95baf96090d9 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -56,6 +56,24 @@ #define __attribute_used__ __attribute__((__unused__)) #endif +/* + * From the GCC manual: + * + * Many functions have no effects except the return value and their + * return value depends only on the parameters and/or global + * variables. Such a function can be subject to common subexpression + * elimination and loop optimization just as an arithmetic operator + * would be. + * [...] + * The attribute `pure' is not implemented in GCC versions earlier + * than 2.96. + */ +#if (__GNUC__ == 2 && __GNUC_MINOR >= 96) || __GNUC__ > 2 +#define __attribute_pure__ __attribute__((pure)) +#else +#define __attribute_pure__ /* unimplemented */ +#endif + /* This macro obfuscates arithmetic on a variable address so that gcc shouldn't recognize the original var, and make assumptions about it */ #define RELOC_HIDE(ptr, off) \ |