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Code Issues Releases Wiki Activity

drm/i915: be more solid in checking the alignment 

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
This commit is contained in:
Matthew Auld 2020-03-05 20:35:34 +00:00 committed by Chris Wilson
parent 64dc802aa5
commit 2920516b2f
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -430,7 +430,8 @@ eb_validate_vma(struct i915_execbuffer *eb,
if (unlikely(entry->flags & eb->invalid_flags))
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;
/*

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

@ -236,6 +236,11 @@ static inline u64 ptr_to_u64(const void *ptr)
__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,
struct list_head *first)
{