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

[Greg Kroah-Hartman]

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@xxxxxxxxxx/
> 
> 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