RE: [RFC] avoid indirect calls for DMA direct mappings v2

["Luck, Tony" <tony.luck@xxxxxxxxx>]

> This should fix it:
...
> +#include <linux/dma-noncoherent.h>

Not quite. Still have an issue with __phys_to_pfn(paddr)

Trying ti #include <asm-generic/memory_model.h> gave we a raft of redefined
macros. So I just added

#define      __phys_to_pfn(paddr)    PHYS_PFN(paddr)

to arch/ia64/mm/init.c

That made the build work. But boot spontaneously resets after:

mptsas: ioc1: attaching ssp device: fw_channel 0, fw_id 6, phy 6, sas_addr 0x5000c5000ecada69
scsi 5:0:0:0: Direct-Access     SEAGATE  ST9146802SS      0003 PQ: 0 ANSI: 5
EFI Variables Facility v0.08 2004-May-17
sd 5:0:0:0: [sdb] 286749488 512-byte logical blocks: (147 GB/137 GiB)
sd 5:0:0:0: [sdb] Write Protect is off
sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, supports DPO and FUA
 sdb: sdb1 sdb2
sd 5:0:0:0: [sdb] Attached SCSI disk

But that might not be your fault. My ancient system is getting flaky. A v4.19 build that
has booted before is also resetting :-(

-Tony