Author: hselasky
Date: Mon Jul 13 15:41:55 2020
New Revision: 363155
URL: https://svnweb.freebsd.org/changeset/base/363155
Log:
MFC r362781 and r362794:
Implement is_signed(), type_max() and type_min() function macros in the
LinuxKPI.
Sponsored by: Mellanox Technologies
Modified:
stable/11/sys/compat/linuxkpi/common/include/linux/kernel.h
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/compat/linuxkpi/common/include/linux/kernel.h
==============================================================================
--- stable/11/sys/compat/linuxkpi/common/include/linux/kernel.h Mon Jul 13
15:40:55 2020 (r363154)
+++ stable/11/sys/compat/linuxkpi/common/include/linux/kernel.h Mon Jul 13
15:41:55 2020 (r363155)
@@ -536,4 +536,33 @@ linux_ratelimited(linux_ratelimit_t *rl)
#define __is_constexpr(x) \
__builtin_constant_p(x)
+/*
+ * 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)
+
+/*
+ * 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) \
+)
+
+/*
+ * 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_ */
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