Date: Tue, 2 Jun 2020 10:19:45 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r361723 - head/sys/compat/linuxkpi/common/include/linux Message-ID: <202006021019.052AJjxk060018@repo.freebsd.org>
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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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