From: Sasha Levin Date: Wed, 3 Dec 2014 14:26:25 +0000 (-0500) Subject: amdkfd: use sizeof(long) granularity for the pasid bitmask X-Git-Tag: firefly_0821_release~176^2~2672^2~10^2~2 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=aeda036c371c58d3a6dcb3e5ac3c1503e7ffc4cf;p=firefly-linux-kernel-4.4.55.git amdkfd: use sizeof(long) granularity for the pasid bitmask 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 Signed-off-by: Oded Gabbay --- diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c index 2458ab7c0c6e..71699ad97d74 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c @@ -32,8 +32,7 @@ int kfd_pasid_init(void) { pasid_limit = max_num_of_processes; - pasid_bitmap = kzalloc(DIV_ROUND_UP(pasid_limit, BITS_PER_BYTE), - GFP_KERNEL); + pasid_bitmap = kzalloc(BITS_TO_LONGS(pasid_limit), GFP_KERNEL); if (!pasid_bitmap) return -ENOMEM;