[PATCH 11/12] swiotlb: merge swiotlb-xen initialization into swiotlb

[Boris Ostrovsky]

On 3/1/22 5:53 AM, Christoph Hellwig wrote:
> Allow to pass a remap argument to the swiotlb initialization functions
> to handle the Xen/x86 remap case.  ARM/ARM64 never did any remapping
> from xen_swiotlb_fixup, so we don't even need that quirk.


Any chance this patch could be split? Lots of things are happening here and it's somewhat hard to review. (Patch 7 too BTW but I think I managed to get through it)


> diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> index e0def4b1c3181..2f2c468acb955 100644
> --- a/arch/x86/kernel/pci-dma.c
> +++ b/arch/x86/kernel/pci-dma.c
> @@ -71,15 +71,12 @@ static inline void __init pci_swiotlb_detect(void)
>   #endif /* CONFIG_SWIOTLB */
>   
>   #ifdef CONFIG_SWIOTLB_XEN
> -static bool xen_swiotlb;
> -
>   static void __init pci_xen_swiotlb_init(void)
>   {
>   	if (!xen_initial_domain() && !x86_swiotlb_enable)
>   		return;


Now that there is a single call site for this routine I think this check can be dropped. We are only called here for xen_initial_domain()==true.


-boris