svn commit: r363154 - stable/12/sys/compat/linuxkpi/common/include/linux

[Hans Petter Selasky]

Author: hselasky
Date: Mon Jul 13 15:40:55 2020
New Revision: 363154
URL: https://svnweb.freebsd.org/changeset/base/363154

Log:
  MFC r362781 and r362794:
  Implement is_signed(), type_max() and type_min() function macros in the
  LinuxKPI.
  
  Sponsored by:	Mellanox Technologies

Modified:
  stable/12/sys/compat/linuxkpi/common/include/linux/kernel.h
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/compat/linuxkpi/common/include/linux/kernel.h
==============================================================================
--- stable/12/sys/compat/linuxkpi/common/include/linux/kernel.h	Mon Jul 13 15:37:59 2020	(r363153)
+++ stable/12/sys/compat/linuxkpi/common/include/linux/kernel.h	Mon Jul 13 15:40:55 2020	(r363154)
@@ -543,4 +543,33 @@ 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_ */