question about " __builtin_constant_p(n)"

[Rolf Liu]

Hi, all,
I have encountered a function named "__builtin_constant_p" at reading the
kernel source,
I guess it is a function provided by compiler.
Who can tell me the usage of it ?
thanks a lot .


Rolf Liu
Software Center Motorola China
Global Software Division, Motorola,Inc.
No 2 Dong San Huan Nan Lu (7th Floor)
Chao Yang District, Beijing 100022, P. R. China
Email: rolfl at sc.mcel.mot.com
Phone: 86-10-65642023            Fax: 86-10-65668458
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