From 8e66e134e20b936179ea1535dd4ed19ec4f99dba Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Wed, 15 Oct 2014 17:20:55 -0400 Subject: [PATCH] drm/radeon: fix vm page table block size calculation The page offset is 12 bits. For example if we have an 8 GB VM, we'd need 33 bits. The number of bits needed for PD + PT is 21 (33 - 12 or log2(8) + 18), not 20 (log2(8) + 17). Noticed by Alexey during code review. Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/gpu/drm/radeon/radeon_device.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index 6fbab1582112..55065d844205 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -1126,7 +1126,7 @@ static void radeon_check_arguments(struct radeon_device *rdev) if (radeon_vm_block_size == -1) { /* Total bits covered by PD + PTs */ - unsigned bits = ilog2(radeon_vm_size) + 17; + unsigned bits = ilog2(radeon_vm_size) + 18; /* Make sure the PD is 4K in size up to 8GB address space. Above that split equal between PD and PTs */ -- 2.30.2