__const_hweight16

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#define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16))

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#define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w))

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#define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w))

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#define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16))

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#define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w))

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#define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w))