[src/riastradh-drm2]: src/sys/external/bsd/drm2/include/linux Implement Linux...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/329c2e7d39d1
branches:  riastradh-drm2
changeset: 788077:329c2e7d39d1
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Jul 24 02:07:31 2013 +0000

description:
Implement Linux's kludgerous pointers-as-errors in <linux/err.h>.

diffstat:

 sys/external/bsd/drm2/include/linux/err.h |  87 +++++++++++++++++++++++++++++++
 1 files changed, 87 insertions(+), 0 deletions(-)

diffs (91 lines):

diff -r bca4a4f89796 -r 329c2e7d39d1 sys/external/bsd/drm2/include/linux/err.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/external/bsd/drm2/include/linux/err.h Wed Jul 24 02:07:31 2013 +0000
@@ -0,0 +1,87 @@
+/*     $NetBSD: err.h,v 1.1.2.1 2013/07/24 02:07:31 riastradh Exp $    */
+
+/*-
+ * Copyright (c) 2013 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_ERR_H_
+#define _LINUX_ERR_H_
+
+/* XXX Linux uses long and int inconsistently here.  Hope this works out.  */
+
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/systm.h>
+
+#define        MAX_ERRNO       ELAST
+
+static inline bool
+IS_ERR_VALUE(uintptr_t n)
+{
+       return (n >= (uintptr_t)-MAX_ERRNO);
+}
+
+static inline void *
+ERR_PTR(int error)
+{
+       KASSERT(error < 0);
+       return (void *)(intptr_t)error;
+}
+
+static inline int
+PTR_ERR(const void *ptr)
+{
+       KASSERT((intptr_t)INT_MAX <= (intptr_t)ptr);
+       return (int)(intptr_t)ptr;
+}
+
+static inline bool
+IS_ERR(const void *ptr)
+{
+       return IS_ERR_VALUE((uintptr_t)ptr);
+}
+
+static inline bool
+IS_ERR_OR_NULL(const void *ptr)
+{
+       return ((ptr == NULL) || IS_ERR(ptr));
+}
+
+static inline void *
+ERR_CAST(void *ptr)            /* XXX Linux declares with const.  */
+{
+       return ptr;
+}
+
+static inline int
+PTR_RET(const void *ptr)
+{
+       return (IS_ERR(ptr)? PTR_ERR(ptr) : 0);
+}
+
+#endif  /* _LINUX_ERR_H_ */