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drm/i915: Mark the ggtt_view structs as packed

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In the next few patches, we will depend upon there being no
uninitialised bits inside the ggtt_view. To ensure this we add the
__packed attribute and double check with a build bug that gcc hasn't
expanded the struct to include some padding bytes.

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/20170114002827.31315-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-01-14 00:28:22 +00:00
parent 7ff19c560f
commit 8d9046ad5d
1 changed files with 12 additions and 2 deletions
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14
drivers/gpu/drm/i915/i915_gem_gtt.h
View file

@ -156,12 +156,22 @@ struct intel_rotation_info {
/* tiles */
unsigned int width, height, stride, offset;
} plane[2];
};
} __packed;
static inline void assert_intel_rotation_info_is_packed(void)
{
BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
}
struct intel_partial_info {
u64 offset;
unsigned int size;
};
} __packed;
static inline void assert_intel_partial_info_is_packed(void)
{
BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
}
struct i915_ggtt_view {
enum i915_ggtt_view_type type;