Hi Jean,
On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote:
> Since commit 518a2f1925c3 ("dma-mapping: zero memory returned from
> dma_alloc_*"), dma_alloc_* always initializes memory to zero, so there
> is no need to use dma_zalloc_* or pass the __GFP_ZERO flag anymore.
>
> The flag was introduced by commit 04fa26c71be5 ("iommu/arm-smmu: Convert
> DMA buffer allocations to the managed API"), since the managed API
> didn't provide a dmam_zalloc_coherent() function.
>
> Signed-off-by: Jean-Philippe Brucker <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Thanks
Eric
> ---
> drivers/iommu/arm-smmu-v3.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index effe72eb89e7..d4e8b7f8d9f4 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -1675,7 +1675,7 @@ static int arm_smmu_init_l2_strtab(struct
> arm_smmu_device *smmu, u32 sid)
>
> desc->span = STRTAB_SPLIT + 1;
> desc->l2ptr = dmam_alloc_coherent(smmu->dev, size, &desc->l2ptr_dma,
> - GFP_KERNEL | __GFP_ZERO);
> + GFP_KERNEL);
> if (!desc->l2ptr) {
> dev_err(smmu->dev,
> "failed to allocate l2 stream table for SID %u\n",
> @@ -2161,8 +2161,7 @@ static int arm_smmu_domain_finalise_s1(struct
> arm_smmu_domain *smmu_domain,
> return asid;
>
> cfg->cdptr = dmam_alloc_coherent(smmu->dev, CTXDESC_CD_DWORDS << 3,
> - &cfg->cdptr_dma,
> - GFP_KERNEL | __GFP_ZERO);
> + &cfg->cdptr_dma, GFP_KERNEL);
> if (!cfg->cdptr) {
> dev_warn(smmu->dev, "failed to allocate context descriptor\n");
> ret = -ENOMEM;
> @@ -2883,7 +2882,7 @@ static int arm_smmu_init_strtab_2lvl(struct
> arm_smmu_device *smmu)
>
> l1size = cfg->num_l1_ents * (STRTAB_L1_DESC_DWORDS << 3);
> strtab = dmam_alloc_coherent(smmu->dev, l1size, &cfg->strtab_dma,
> - GFP_KERNEL | __GFP_ZERO);
> + GFP_KERNEL);
> if (!strtab) {
> dev_err(smmu->dev,
> "failed to allocate l1 stream table (%u bytes)\n",
> @@ -2910,7 +2909,7 @@ static int arm_smmu_init_strtab_linear(struct
> arm_smmu_device *smmu)
>
> size = (1 << smmu->sid_bits) * (STRTAB_STE_DWORDS << 3);
> strtab = dmam_alloc_coherent(smmu->dev, size, &cfg->strtab_dma,
> - GFP_KERNEL | __GFP_ZERO);
> + GFP_KERNEL);
> if (!strtab) {
> dev_err(smmu->dev,
> "failed to allocate linear stream table (%u bytes)\n",
>
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