Author: hselasky
Date: Tue Jun 2 10:19:45 2020
New Revision: 361723
URL: https://svnweb.freebsd.org/changeset/base/361723
Log:
Implement struct_size() function macro 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 Tue Jun 2
09:45:43 2020 (r361722)
+++ head/sys/compat/linuxkpi/common/include/linux/kernel.h Tue Jun 2
10:19:45 2020 (r361723)
@@ -555,4 +555,10 @@ linux_ratelimited(linux_ratelimit_t *rl)
return (ppsratecheck(&rl->lasttime, &rl->counter, 1));
}
+#define struct_size(ptr, field, num) ({ \
+ const size_t __size = offsetof(__typeof(*(ptr)), field); \
+ const size_t __max = (SIZE_MAX - __size) / sizeof((ptr)->field[0]); \
+ ((num) > __max) ? SIZE_MAX : (__size + sizeof((ptr)->field[0]) *
(num)); \
+})
+
#endif /* _LINUX_KERNEL_H_ */
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