linux-kernel - Re: [PATCH v3 1/2] arm64: refactor the rodata=xxx

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Message-ID: <7e89f00b-0b7a-4ef6-90e6-bb5f1b7946e2@amperemail.onmicrosoft.com>
Date: Tue, 10 Dec 2024 11:22:09 +0800
From: Shijie Huang <shijie@...eremail.onmicrosoft.com>
To: "Christoph Lameter (Ampere)" <cl@...two.org>,
 Huang Shijie <shijie@...amperecomputing.com>
Cc: catalin.marinas@....com, will@...nel.org, anshuman.khandual@....com,
 corbet@....net, patches@...erecomputing.com, akpm@...ux-foundation.org,
 thuth@...hat.com, rostedt@...dmis.org, xiongwei.song@...driver.com,
 ardb@...nel.org, inux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] arm64: refactor the rodata=xxx


On 2024/12/10 1:05, Christoph Lameter (Ampere) wrote:
>> --- a/Documentation/admin-guide/kernel-parameters.txt
>> +++ b/Documentation/admin-guide/kernel-parameters.txt
>> @@ -5901,7 +5901,7 @@
>>   	rodata=		[KNL,EARLY]
>>   		on	Mark read-only kernel memory as read-only (default).
>>   		off	Leave read-only kernel memory writable for debugging.
>> -		full	Mark read-only kernel memory and aliases as read-only
>> +		noalias	Use more block mappings,may have better performance.
>>   		        [arm64]
> Maybe use
> 		noalias Do not check aliases in order to allow larger kernel page
>                          sizes on a platforms without FEAT_BBM2 support[arm64])
>
> instead?

The "rodata=noalias" here is equal to original "rodata=on".

But Yang Shi's patch set works with original "rodata=full" :

https://lists.infradead.org/pipermail/linux-arm-kernel/2024-November/979770.html


IMHO, it's not proper to mention the FEAT_BBM in "rodata=noalias".



Thanks

Huang Shijie