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drm/i915: be more solid in checking the alignment

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The alignment is u64, and yet is_power_of_2() assumes unsigned long,
which might give different results between 32b and 64b kernel.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200305203534.210466-1-matthew.auld@intel.com
Cc: stable@vger.kernel.org
(cherry picked from commit 2920516b2f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Matthew Auld 2020-03-05 20:35:34 +00:00 committed by Jani Nikula
parent 259170cb4c
commit 1d61c5d711
2 changed files with 7 additions and 1 deletions
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3
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -423,7 +423,8 @@ eb_validate_vma(struct i915_execbuffer *eb,
if (unlikely(entry->flags & eb->invalid_flags)) if (unlikely(entry->flags & eb->invalid_flags))
return -EINVAL; return -EINVAL;
if (unlikely(entry->alignment && !is_power_of_2(entry->alignment))) if (unlikely(entry->alignment &&
!is_power_of_2_u64(entry->alignment)))
return -EINVAL; return -EINVAL;
/* /*

5
drivers/gpu/drm/i915/i915_utils.h
View File

@ -234,6 +234,11 @@ static inline u64 ptr_to_u64(const void *ptr)
__idx; \ __idx; \
}) })
static inline bool is_power_of_2_u64(u64 n)
{
return (n != 0 && ((n & (n - 1)) == 0));
}
static inline void __list_del_many(struct list_head *head, static inline void __list_del_many(struct list_head *head,
struct list_head *first) struct list_head *first)
{ {