svn commit: r362781 - head/sys/compat/linuxkpi/common/include/linux

[Hans Petter Selasky]

Author: hselasky
Date: Mon Jun 29 13:08:40 2020
New Revision: 362781
URL: https://svnweb.freebsd.org/changeset/base/362781

Log:
  Implement is_signed(), type_max() and type_min() function macros in the
  LinuxKPI.
  
  MFC after:	1 week
  Sponsored by:	Mellanox Technologies

Modified:
  head/sys/compat/linuxkpi/common/include/linux/kernel.h

Modified: head/sys/compat/linuxkpi/common/include/linux/kernel.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/kernel.h	Mon Jun 29 12:59:09 2020	(r362780)
+++ head/sys/compat/linuxkpi/common/include/linux/kernel.h	Mon Jun 29 13:08:40 2020	(r362781)
@@ -564,4 +564,20 @@ linux_ratelimited(linux_ratelimit_t *rl)
 #define	__is_constexpr(x) \
 	__builtin_constant_p(x)
 
+#define	is_signed(x) (((x)-1 / (x)2) == (x)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)	\
+)
+
+#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)	\
+)
+
 #endif	/* _LINUX_KERNEL_H_ */