Module Name: src
Committed By: riastradh
Date: Sun Dec 19 12:20:21 UTC 2021
Added Files:
src/sys/external/bsd/common/include/linux: overflow.h
Removed Files:
src/sys/external/bsd/drm2/include/linux: overflow.h
Log Message:
linux: Move linux/overflow.h from drm2 to common.
Needed so linux/slab.h can side-load it.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/sys/external/bsd/common/include/linux/overflow.h
cvs rdiff -u -r1.4 -r0 src/sys/external/bsd/drm2/include/linux/overflow.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/sys/external/bsd/common/include/linux/overflow.h
diff -u /dev/null src/sys/external/bsd/common/include/linux/overflow.h:1.1
--- /dev/null Sun Dec 19 12:20:21 2021
+++ src/sys/external/bsd/common/include/linux/overflow.h Sun Dec 19 12:20:21 2021
@@ -0,0 +1,86 @@
+/* $NetBSD: overflow.h,v 1.1 2021/12/19 12:20:21 riastradh Exp $ */
+
+/*-
+ * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Taylor R. Campbell.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_OVERFLOW_H_
+#define _LINUX_OVERFLOW_H_
+
+#include <sys/types.h>
+
+#include <lib/libkern/libkern.h> /* offsetof */
+
+#define check_mul_overflow(a, b, res) __builtin_mul_overflow(a, b, res)
+#define check_add_overflow(a, b, res) __builtin_add_overflow(a, b, res)
+
+/* return x*y saturated at SIZE_MAX */
+static inline size_t
+array_size(size_t x, size_t y)
+{
+ size_t xy;
+
+ if (check_mul_overflow(x, y, &xy))
+ return SIZE_MAX;
+ return xy;
+}
+
+/* return x*y*z saturated at SIZE_MAX */
+static inline size_t
+array3_size(size_t x, size_t y, size_t z)
+{
+ size_t xy, xyz;
+
+ if (check_mul_overflow(x, y, &xy))
+ return SIZE_MAX;
+ if (check_mul_overflow(xy, z, &xyz))
+ return SIZE_MAX;
+ return xyz;
+}
+
+/* return basesize + elemsize*nelem saturated at SIZE_MAX */
+static inline size_t
+__struct_size(size_t basesize, size_t elemsize, size_t nelem)
+{
+ size_t arraysize, totalsize;
+
+ KASSERT(elemsize);
+ if ((arraysize = array_size(elemsize, nelem)) == SIZE_MAX)
+ return SIZE_MAX;
+ if (check_add_overflow(basesize, arraysize, &totalsize))
+ return SIZE_MAX;
+ return totalsize;
+}
+
+#define struct_size(p, member, n) \
+({ \
+ CTASSERT(sizeof(*(p)) == offsetof(__typeof__(*(p)), member)); \
+ __struct_size(sizeof(*(p)), sizeof((p)->member[0]), (n)); \
+})
+
+#endif /* _LINUX_OVERFLOW_H_ */
