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Document the is_signed(), type_max() and type_min() function macros in the

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LinuxKPI. Try to make the function argument more readable.

Suggested by:	several
MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2020-06-30 08:41:33 +00:00
parent fd5f7f341b
commit d326a6c7c1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362794
1 changed files with 24 additions and 11 deletions
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35
sys/compat/linuxkpi/common/include/linux/kernel.h
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@ -564,20 +564,33 @@ linux_ratelimited(linux_ratelimit_t *rl)
#define __is_constexpr(x) \
__builtin_constant_p(x)
#define is_signed(x) (((x)-1 / (x)2) == (x)0)
/*
* The is_signed() macro below returns true if the passed data type is
* signed. Else false is returned.
*/
#define is_signed(datatype) (((datatype)-1 / (datatype)2) == (datatype)0)
#define type_max(x) ( \
(sizeof(x) >= 8) ? (is_signed(x) ? INT64_MAX : UINT64_MAX) : \
(sizeof(x) >= 4) ? (is_signed(x) ? INT32_MAX : UINT32_MAX) : \
(sizeof(x) >= 2) ? (is_signed(x) ? INT16_MAX : UINT16_MAX) : \
(is_signed(x) ? INT8_MAX : UINT8_MAX) \
/*
* The type_max() macro below returns the maxium positive value the
* passed data type can hold.
*/
#define type_max(datatype) ( \
(sizeof(datatype) >= 8) ? (is_signed(datatype) ? INT64_MAX : UINT64_MAX) : \
(sizeof(datatype) >= 4) ? (is_signed(datatype) ? INT32_MAX : UINT32_MAX) : \
(sizeof(datatype) >= 2) ? (is_signed(datatype) ? INT16_MAX : UINT16_MAX) : \
(is_signed(datatype) ? INT8_MAX : UINT8_MAX) \
)
#define type_min(x) ( \
(sizeof(x) >= 8) ? (is_signed(x) ? INT64_MIN : 0) : \
(sizeof(x) >= 4) ? (is_signed(x) ? INT32_MIN : 0) : \
(sizeof(x) >= 2) ? (is_signed(x) ? INT16_MIN : 0) : \
(is_signed(x) ? INT8_MIN : 0) \
/*
* The type_min() macro below returns the minimum value the passed
* data type can hold. For unsigned types the minimum value is always
* zero. For signed types it may vary.
*/
#define type_min(datatype) ( \
(sizeof(datatype) >= 8) ? (is_signed(datatype) ? INT64_MIN : 0) : \
(sizeof(datatype) >= 4) ? (is_signed(datatype) ? INT32_MIN : 0) : \
(sizeof(datatype) >= 2) ? (is_signed(datatype) ? INT16_MIN : 0) : \
(is_signed(datatype) ? INT8_MIN : 0) \
)
#endif /* _LINUX_KERNEL_H_ */