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Date:   Wed, 13 Jul 2022 08:02:46 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Tianyu Lan <ltykernel@gmail.com>
Cc:     kernel test robot <oliver.sang@intel.com>,
        Tianyu Lan <Tianyu.Lan@microsoft.com>,
        Christoph Hellwig <hch@lst.de>, linux-doc@vger.kernel.org,
        iommu@lists.linux.dev, lkp@lists.01.org, lkp@intel.com
Subject: Re: [EXTERNAL] [swiotlb] 44d89f2248:
 Kernel_panic-not_syncing:swiotlb_init_remap:nslabs=#too_small
Message-ID: <20220713060246.GA13497@lst.de>
References: <Ys43FtIumAsHPn+y@xsang-OptiPlex-9020> <c8edfbd4-afad-c018-daf6-aa2ac1f7b2fe@gmail.com>
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On Wed, Jul 13, 2022 at 01:58:38PM +0800, Tianyu Lan wrote:
> Thanks for report. The issue is caused by auto merging between
> commit44d89f("swiotlb: split up the global swiotlb lock") and commit 
> 0bf28fc40(swiotlb: panic if nslabs is too small). nslab is checked before 
> initialization.
>
> Christoph, do you prefer to update patch "swiotlb: split up the global 
> swiotlb lock" or append a fix patch on current brand?

Please just send a patch againt the current tree.  I'll see if squashing
it in makes any sense.