On Wed, May 22, 2019 at 02:54:50PM -0400, Steven Rostedt wrote: > > From: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> > > When testing 32 bit x86, my build failed with: > > ERROR: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko] undefined! > > It appears that a few non-ULL roundup() calls were made, which uses a > normal division against a 64 bit number. This is fine for x86_64, but > on 32 bit x86, it causes the compiler to look for a helper function > __udivdi3, which we do not have in the kernel, and thus fails to build. > > Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> > --- ... > diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c > index abac70ad5c7c..40d4c5f7ea43 100644 > --- a/drivers/infiniband/hw/mlx5/main.c > +++ b/drivers/infiniband/hw/mlx5/main.c > @@ -2344,7 +2344,7 @@ static int handle_alloc_dm_sw_icm(struct ib_ucontext *ctx, > /* Allocation size must a multiple of the basic block size > * and a power of 2. > */ > - act_size = roundup(attr->length, MLX5_SW_ICM_BLOCK_SIZE(dm_db->dev)); > + act_size = DIV_ROUND_UP_ULL(attr->length, MLX5_SW_ICM_BLOCK_SIZE(dm_db->dev)); > act_size = roundup_pow_of_two(act_size); > > dm->size = act_size; This seems wrong: roundup() rounds up to a multiple of second argument but DIV_ROUND_UP_ULL() would divide with rounding up. Michal Kubecek
