linux-kernel - Re: [PATCH rfcv2 1/8] iommu/arm-smmu-v3: Clear cmds->num after arm_smmu_cmdq_batch

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Message-ID: <aMDo7vljVeeWWzRE@Asurada-Nvidia>
Date: Tue, 9 Sep 2025 19:56:46 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <will@...nel.org>, <robin.murphy@....com>
CC: <joro@...tes.org>, <jean-philippe@...aro.org>, <miko.lenczewski@....com>,
	<balbirs@...dia.com>, <peterz@...radead.org>, <smostafa@...gle.com>,
	<kevin.tian@...el.com>, <praan@...gle.com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <patches@...ts.linux.dev>
Subject: Re: [PATCH rfcv2 1/8] iommu/arm-smmu-v3: Clear cmds->num after
 arm_smmu_cmdq_batch_submit

On Mon, Sep 08, 2025 at 04:26:55PM -0700, Nicolin Chen wrote:
> None of the callers of arm_smmu_cmdq_batch_submit() cares about the batch
> after a submission. So, it'll be certainly safe to nuke the cmds->num, at
> least upon a successful one. This will ease a bit a wrapper function, for
> the new arm_smmu_invs structure.

This was added when arm_smmu_cmdq_batch_submit() was needed by a
new arm_smmu_invs helper that used it at a few places. But after
a few rounds of rework, I found that there is only one call now.

I will drop this patch.

Thanks
Nicolin