提交 1ba4f22c 编写于 作者: H H. Peter Anvin

x86, cpufeature: Unbreak compile with gcc 3.x

gcc 3 is too braindamaged to be able to compile static_cpu_has() --
apparently it can't tell that a constant passed to an inline function
is still a constant -- so if we're using gcc 3, just use the dynamic
test.  This is bad for performance, but if you care about performance,
don't use an ancient, known-to-optimize-poorly compiler.
Reported-and-tested-by: NEric Dumazet <eric.dumazet@gmail.com>
LKML-Reference: <4BF2FF82.7090005@zytor.com>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
上级 20413f27
......@@ -332,6 +332,7 @@ static __always_inline __pure bool __static_cpu_has(u8 bit)
#endif
}
#if __GNUC__ >= 4
#define static_cpu_has(bit) \
( \
__builtin_constant_p(boot_cpu_has(bit)) ? \
......@@ -340,6 +341,12 @@ static __always_inline __pure bool __static_cpu_has(u8 bit)
__static_cpu_has(bit) : \
boot_cpu_has(bit) \
)
#else
/*
* gcc 3.x is too stupid to do the static test; fall back to dynamic.
*/
#define static_cpu_has(bit) boot_cpu_has(bit)
#endif
#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
......
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