linux-kernel - Re: [PATCH 5.19 319/365] swiotlb: panic if nslabs is too small

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Date:   Wed, 24 Aug 2022 08:56:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dongli Zhang <dongli.zhang@...cle.com>
Cc:     Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Yu Zhao <yuzhao@...gle.com>, stable@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH 5.19 319/365] swiotlb: panic if nslabs is too small

On Tue, Aug 23, 2022 at 10:25:27AM -0700, Dongli Zhang wrote:
> Adding Robin, Yu and swiotlb list.
> 
> Hi Greg,
> 
> There is an on-going discussion whether to revert this patch, because it breaks
> a corner case in MIPS when many kernel CONFIGs are not enabled (related to PCI
> and device). As a result, MIPS pre-allocates only PAGE_SIZE buffer as swiotlb.
> 
> https://lore.kernel.org/all/20220820012031.1285979-1-yuzhao@google.com/
> 
> However, the core idea of the patch is to panic on purpose if the swiotlb is
> configured with <1MB memory, in order to sync with the remap failure handler in
> swiotlb_init_remap().

Ok, I've dropped it from the 5.19 queue now.  If you want it added to a
future kernel release, just resend it.

thanks,

greg k-h