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mlx5: avoid 64-bit division in dr_icm_pool_mr_create()

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Recently added code introduces 64-bit division in dr_icm_pool_mr_create()
so that build on 32-bit architectures fails with

  ERROR: "__umoddi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!

As the divisor is always a power of 2, we can use bitwise operation
instead.

Fixes: 29cf8febd1 ("net/mlx5: DR, ICM pool memory allocator")
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek 2019-10-02 14:12:41 +02:00 committed by David S. Miller
parent e95584a889
commit 8b6b82ad16
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c
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@ -137,7 +137,8 @@ dr_icm_pool_mr_create(struct mlx5dr_icm_pool *pool,
icm_mr->icm_start_addr = icm_mr->dm.addr;
align_diff = icm_mr->icm_start_addr % align_base;
/* align_base is always a power of 2 */
align_diff = icm_mr->icm_start_addr & (align_base - 1);
if (align_diff)
icm_mr->used_length = align_base - align_diff;