From 86e61735710902535ebd00decc035f5e129a377e Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Tue, 13 Dec 2016 20:32:21 +0000 Subject: [PATCH] drm/i915: introduce range_overflows utility macros In a number places we hand-roll the overflow sanity check for ranges, so roll that into single macro, conceived by Chris, along with its typed variant. Cc: Joonas Lahtinen Cc: Chris Wilson Suggested-by: Chris Wilson Signed-off-by: Matthew Auld Link: http://patchwork.freedesktop.org/patch/msgid/20161213203222.32564-3-matthew.auld@intel.com Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_drv.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 20bc04d5e617..085c8ecd09b5 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -218,6 +218,18 @@ static inline const char *enableddisabled(bool v) return v ? "enabled" : "disabled"; } +#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)) + enum pipe { INVALID_PIPE = -1, PIPE_A = 0, -- 2.20.1