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authorChris Wilson <chris@chris-wilson.co.uk>2017-01-05 18:30:22 +0300
committerChris Wilson <chris@chris-wilson.co.uk>2017-01-05 18:34:45 +0300
commit40b326eefe0ae89fa7e8b272f51382c55563e179 (patch)
tree0ee9b6d275272334d12f4f93602840e43252d871 /drivers/gpu/drm/i915/i915_utils.h
parentf3b8f9126a9f3312636780fe83b923f3f63137fb (diff)
downloadlinux-40b326eefe0ae89fa7e8b272f51382c55563e179.tar.xz
drm/i915: Move a few utility macros into a separate header
In order to defeat some circular dependencies between headers to allow use of e.g. range_overflows() in a header, move the simple independent macros into their own header. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170105153023.30575-4-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_utils.h')
-rw-r--r--drivers/gpu/drm/i915/i915_utils.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
new file mode 100644
index 000000000000..9983ef30bac8
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 __I915_UTILS_H
+#define __I915_UTILS_H
+
+#define range_overflows(start, size, max) ({ \
+ typeof(start) start__ = (start); \
+ typeof(size) size__ = (size); \
+ typeof(max) max__ = (max); \
+ (void)(&start__ == &size__); \
+ (void)(&start__ == &max__); \
+ start__ > max__ || size__ > max__ - start__; \
+})
+
+#define range_overflows_t(type, start, size, max) \
+ range_overflows((type)(start), (type)(size), (type)(max))
+
+/* Note we don't consider signbits :| */
+#define overflows_type(x, T) \
+ (sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE))
+
+#endif /* !__I915_UTILS_H */