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amdkfd: use sizeof(long) granularity for the pasid bitmask

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All the bit operations (such as find_first_zero_bit()) read sizeof(long) bytes
at a time. If we allocated less than sizeof(long) bytes for the bitmask we
would be accessing invalid memory when working with the bitmask.

Change the allocator to allocate sizeof(long) multiples for the bitmask.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
This commit is contained in:
Sasha Levin 2014-12-03 09:26:25 -05:00 • committed by Oded Gabbay
parent d5b75dc01f
commit aeda036c37
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/amd/amdkfd/kfd_pasid.c
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@ -32,8 +32,7 @@ int kfd_pasid_init(void)
{ {
pasid_limit = max_num_of_processes; pasid_limit = max_num_of_processes;
pasid_bitmap = kzalloc(DIV_ROUND_UP(pasid_limit, BITS_PER_BYTE), pasid_bitmap = kzalloc(BITS_TO_LONGS(pasid_limit), GFP_KERNEL);
GFP_KERNEL);
if (!pasid_bitmap) if (!pasid_bitmap)
return -ENOMEM; return -ENOMEM;