Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits

Christophe Leroy
2024-09-10T09:20:56Z

>>> diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h
>>> index 49796b7756af..cd3b8c154d9b 100644
>>> --- a/include/uapi/linux/personality.h
>>> +++ b/include/uapi/linux/personality.h
>>> @@ -22,6 +22,7 @@ enum {
>>> WHOLE_SECONDS = 0x2000000,
>>> STICKY_TIMEOUTS = 0x4000000,
>>> ADDR_LIMIT_3GB = 0x8000000,
>>> + ADDR_LIMIT_47BIT = 0x10000000,
>>> };
>>
>> I wonder if ADDR_LIMIT_128T would be clearer?
>>
>
> I don't follow, what does 128T represent?
>

128T is 128 Terabytes, that's the maximum size achievable with a 47BIT
address, that naming would be more consistant with the ADDR_LIMIT_3GB
just above that means a 3 Gigabytes limit.

Christophe