[PATCH v6.1] iommu/dma: Add support for mapping MSIs

[Thomas Gleixner]

On Wed, 7 Sep 2016, Robin Murphy wrote:
> - Rework map_page() helper function plus insane lookup logic into
>   straightforward get_page() helper
> - Use phys_addr_t to further simplify address matching
> - Fix the bit where I neglected to actually round the doorbell
>   address to a page boundary (oops!)
> - Make the locking hardirq-safe to satisfy lockdep

That looks way better.

Acked-by: Thomas Gleixner <tglx at linutronix.de>