linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Fix soft lockup triggered by arm_smmu_mm_invalidate

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Date:   Mon, 18 Sep 2023 13:33:31 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Nicolin Chen <nicolinc@...dia.com>, will@...nel.org,
        robin.murphy@....com
Cc:     baolu.lu@...ux.intel.com, joro@...tes.org, jgg@...dia.com,
        jean-philippe@...aro.org, apopple@...dia.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-v3: Fix soft lockup triggered by
 arm_smmu_mm_invalidate_range

On 9/15/23 3:43 PM, Nicolin Chen wrote:
> I found this patch cannot be applied to v6.6-rc1 due to conflicts
> with some new commits that were merged during the previous cycle.
> 
> I can redo a version rebasing on the v6.6-rc1, yet the new version
> won't apply to earlier kernel stable trees. Is there a way to make
> it happen that both mainline and earlier trees can have this fix?

Normally, bug fixes should first be submitted to the mainline kernel
(also known as Linus's tree). If you use the "Fixes" and "CC-stable"
tags, the patch will be automatically picked up for the appropriate
stable kernels.

If the patch does not apply to any stable kernel that you want it to be
there, you can then post a back-ported patch to the stable mailing list.

When doing so, it's better to include the following information:

- The mainline commit ID of the back-ported patch.
- The versions of the stable kernel(s) to which you want the back-ported
   patch to be applied.

Hope this helps.

Best regards,
baolu