linux-kernel - Re: ksm: initialize rmap values directly and make them const

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5a1cf097-5ab4-41d1-a707-a709de6210cf@kernel.org>
Date: Fri, 6 Feb 2026 18:34:51 +0100
From: "David Hildenbrand (Arm)" <david@...nel.org>
To: Matthew Wilcox <willy@...radead.org>, xu.xin16@....com.cn
Cc: akpm@...ux-foundation.org, chengming.zhou@...ux.dev, hughd@...gle.com,
 wang.yaxin@....com.cn, yang.yang29@....com.cn, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: ksm: initialize rmap values directly and make them const

On 2/6/26 16:29, Matthew Wilcox wrote:
> On Fri, Feb 06, 2026 at 03:22:54PM +0800, xu.xin16@....com.cn wrote:
>> make them const to make code more robust. Besides, since KSM folios are always
>> order-0, so folio_nr_pages(KSM folio) is always 1, so the line:
>>
>> 	"pgoff_end = pgoff_start + folio_nr_pages(folio) - 1;"
>>
>> becomes directly:
>>
>> 	"pgoff_end = pgoff_start;"
> 
> How do you know KSM folios will always be order 0?  I don't.  NAK this
> change.

Once that changes we can revisit. ACK from me stands.

-- 
Cheers,

David