__const_hweight32

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#define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32))

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#define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w))

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#define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w))

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#define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32))

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#define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w))

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#define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w))