From: Zhen Lei <thunder.leizhen@huawei.com>
To: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
"Joerg Roedel" <joro@8bytes.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
iommu <iommu@lists.linux-foundation.org>,
<linux-kernel@vger.kernel.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>,
John Garry <john.garry@huawei.com>
Subject: [PATCH] iommu/arm-smmu-v3: Stop pre-zeroing batch commands in arm_smmu_atc_inv_master()
Date: Tue, 17 Aug 2021 19:34:11 +0800 [thread overview]
Message-ID: <20210817113411.1962-1-thunder.leizhen@huawei.com> (raw)
Pre-zeroing the batched commands structure is inefficient, as individual
commands are zeroed later in arm_smmu_cmdq_build_cmd(). Therefore, only
the member 'num' needs to be initialized to 0.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 50a9db5bac466c7..e6882ae81fd08f6 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1776,10 +1776,11 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
{
int i;
struct arm_smmu_cmdq_ent cmd;
- struct arm_smmu_cmdq_batch cmds = {};
+ struct arm_smmu_cmdq_batch cmds;
arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd);
+ cmds.num = 0;
for (i = 0; i < master->num_streams; i++) {
cmd.atc.sid = master->streams[i].id;
arm_smmu_cmdq_batch_add(master->smmu, &cmds, &cmd);
--
2.26.0.106.g9fadedd
next reply other threads:[~2021-08-17 11:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-17 11:34 Zhen Lei [this message]
2021-08-17 11:53 ` John Garry
2021-10-04 12:05 ` Will Deacon
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