Document the is_signed(), type_max() and type_min() function macros in the
LinuxKPI. Try to make the function argument more readable. Suggested by: several MFC after: 1 week Sponsored by: Mellanox Technologies
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=362794
@ -564,20 +564,33 @@ linux_ratelimited(linux_ratelimit_t *rl)
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#define __is_constexpr(x) \
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#define __is_constexpr(x) \
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__builtin_constant_p(x)
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__builtin_constant_p(x)
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#define is_signed(x) (((x)-1 / (x)2) == (x)0)
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/*
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* The is_signed() macro below returns true if the passed data type is
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* signed. Else false is returned.
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*/
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#define is_signed(datatype) (((datatype)-1 / (datatype)2) == (datatype)0)
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#define type_max(x) ( \
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/*
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(sizeof(x) >= 8) ? (is_signed(x) ? INT64_MAX : UINT64_MAX) : \
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* The type_max() macro below returns the maxium positive value the
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(sizeof(x) >= 4) ? (is_signed(x) ? INT32_MAX : UINT32_MAX) : \
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* passed data type can hold.
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(sizeof(x) >= 2) ? (is_signed(x) ? INT16_MAX : UINT16_MAX) : \
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*/
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(is_signed(x) ? INT8_MAX : UINT8_MAX) \
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#define type_max(datatype) ( \
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(sizeof(datatype) >= 8) ? (is_signed(datatype) ? INT64_MAX : UINT64_MAX) : \
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(sizeof(datatype) >= 4) ? (is_signed(datatype) ? INT32_MAX : UINT32_MAX) : \
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(sizeof(datatype) >= 2) ? (is_signed(datatype) ? INT16_MAX : UINT16_MAX) : \
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(is_signed(datatype) ? INT8_MAX : UINT8_MAX) \
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)
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)
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#define type_min(x) ( \
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/*
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(sizeof(x) >= 8) ? (is_signed(x) ? INT64_MIN : 0) : \
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* The type_min() macro below returns the minimum value the passed
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(sizeof(x) >= 4) ? (is_signed(x) ? INT32_MIN : 0) : \
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* data type can hold. For unsigned types the minimum value is always
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(sizeof(x) >= 2) ? (is_signed(x) ? INT16_MIN : 0) : \
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* zero. For signed types it may vary.
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(is_signed(x) ? INT8_MIN : 0) \
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*/
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#define type_min(datatype) ( \
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(sizeof(datatype) >= 8) ? (is_signed(datatype) ? INT64_MIN : 0) : \
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(sizeof(datatype) >= 4) ? (is_signed(datatype) ? INT32_MIN : 0) : \
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(sizeof(datatype) >= 2) ? (is_signed(datatype) ? INT16_MIN : 0) : \
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(is_signed(datatype) ? INT8_MIN : 0) \
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)
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)
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#endif /* _LINUX_KERNEL_H_ */
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#endif /* _LINUX_KERNEL_H_ */
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