515.43.04

kernel-open/common/inc/nv-list-helpers.h

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+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2013-2020 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __NV_LIST_HELPERS_H__
+#define __NV_LIST_HELPERS_H__
+
+#include <linux/list.h>
+#include "conftest.h"
+
+/*
+ * list_first_entry_or_null added by commit 6d7581e62f8b ("list: introduce
+ * list_first_entry_or_null") in v3.10 (2013-05-29).
+ */
+#if !defined(list_first_entry_or_null)
+    #define list_first_entry_or_null(ptr, type, member) \
+        (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
+#endif
+
+/*
+ * Added by commit 93be3c2eb337 ("list: introduce list_last_entry(), use
+ * list_{first,last}_entry()") in v3.13 (2013-11-12).
+ */
+#if !defined(list_last_entry)
+    #define list_last_entry(ptr, type, member) \
+        list_entry((ptr)->prev, type, member)
+#endif
+
+/* list_last_entry_or_null() doesn't actually exist in the kernel */
+#if !defined(list_last_entry_or_null)
+    #define list_last_entry_or_null(ptr, type, member) \
+        (!list_empty(ptr) ? list_last_entry(ptr, type, member) : NULL)
+#endif
+
+/*
+ * list_prev_entry() and list_next_entry added by commit 008208c6b26f
+ * ("list: introduce list_next_entry() and list_prev_entry()") in
+ * v3.13 (2013-11-12).
+ */
+#if !defined(list_prev_entry)
+    #define list_prev_entry(pos, member) \
+        list_entry((pos)->member.prev, typeof(*(pos)), member)
+#endif
+
+#if !defined(list_next_entry)
+    #define list_next_entry(pos, member) \
+        list_entry((pos)->member.next, typeof(*(pos)), member)
+#endif
+
+#if !defined(NV_LIST_IS_FIRST_PRESENT)
+    static inline int list_is_first(const struct list_head *list,
+                                    const struct list_head *head)
+    {
+        return list->prev == head;
+    }
+#endif
+
+#if defined(NV_HLIST_FOR_EACH_ENTRY_ARGUMENT_COUNT)
+#if NV_HLIST_FOR_EACH_ENTRY_ARGUMENT_COUNT == 3
+#define nv_hlist_for_each_entry(pos, head, member) \
+    hlist_for_each_entry(pos, head, member)
+#else
+#if !defined(hlist_entry_safe)
+#define hlist_entry_safe(ptr, type, member) \
+    (ptr) ? hlist_entry(ptr, type, member) : NULL
+#endif
+
+#define nv_hlist_for_each_entry(pos, head, member)                          \
+    for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);     \
+         pos;                                                               \
+         pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
+#endif
+#endif // NV_HLIST_FOR_EACH_ENTRY_ARGUMENT_COUNT
+
+#endif // __NV_LIST_HELPERS_H__