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

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Message-ID: <1aca8e4c-1c12-4624-a689-147ff60b75d6@csgroup.eu>
Date: Tue, 10 Sep 2024 11:20:44 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Charlie Jenkins <charlie@...osinc.com>,
 Michael Ellerman <mpe@...erman.id.au>
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Subject: Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to
 47 bits

>>> 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