Re: [PATCH v3 4/4] arm64: mte: Optimize mte_assign_mem_tag_range()

From: Vincenzo Frascino
Date: Sun Jan 17 2021 - 07:35:34 EST

Hi Mark,

On 1/16/21 2:22 PM, Vincenzo Frascino wrote:
>> Is there any chance that this can be used for the last bytes of the
>> virtual address space? This might need to change to `_addr == _end` if
>> that is possible, otherwise it'll terminate early in that case.
> Theoretically it is a possibility. I will change the condition and add a note
> for that.

I was thinking to the end of the virtual address space scenario and I forgot
that if I use a condition like `_addr == _end` the tagging operation overflows
to the first granule of the next allocation. This disrupts tagging accesses for
that memory area hence I think that `_addr < _end` is the way to go.