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drm/i915: Warn in debug builds of incorrect usages of ptr_pack_bits

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GEM_BUG_ON if the packed bits do not fit into the specified width.

v2: Avoid using the macro argument twice.
v3: Drop unnecessary braces. (Joonas)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v1)
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171103090538.14474-1-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin 2017-11-03 09:05:38 +00:00
parent ebcaa1ff8b
commit 2d7514152b
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/i915/i915_utils.h
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@ -83,8 +83,11 @@
(typeof(ptr))(__v & -BIT(n)); \
})
#define ptr_pack_bits(ptr, bits, n) \
((typeof(ptr))((unsigned long)(ptr) | (bits)))
#define ptr_pack_bits(ptr, bits, n) ({ \
unsigned long __bits = (bits); \
GEM_BUG_ON(__bits & -BIT(n)); \
((typeof(ptr))((unsigned long)(ptr) | __bits)); \
})
#define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT)
#define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT)