Re: [PATCH] m68k: mm: Remove check for VM_IO to fix deferred I/O

Michael Schmitz
2022-01-29T02:08:54Z

Hi Finn,

Am 29.01.2022 um 12:55 schrieb Finn Thain:
> On Sat, 29 Jan 2022, Michael Schmitz wrote:
>
>> Hi Geert,
>>
>> for hwregs_present(), the exception fixup will handle any access error
>> (through send_fault_sig()), so this should continue to work.
>>
>> Why the special handling of VM_IO pages? Maybe hp300 had marked all IO
>> register pages VM_IO to distinguish IO faults from VM faults...
>>
>> The only other area I can imagine this might have an impact is the Mac's
>> pseudo-DMA - FInn might want to give this some testing.
>>
>
> mac_scsi.c and mac_esp.c don't use ioremap(). They rely on head.S:
>
> mmu_map_eq #0x50000000,#0x03000000,%d3
>
> Having said that, I will run some tests if you still think it necessary.

No need for test then, thanks!

Cheers,

Michael