linux-kernel - Re: [PATCH v3 26/47] arm_mpam: resctrl: Wait for cacheinfo to be ready

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: <5bd84ae7-b9ea-49a8-a2e7-1ccd09117126@arm.com>
Date: Tue, 13 Jan 2026 15:15:43 +0000
From: Ben Horgan <ben.horgan@....com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, carl@...amperecomputing.com,
 dave.martin@....com, david@...nel.org, dfustini@...libre.com,
 fenghuay@...dia.com, gshan@...hat.com, james.morse@....com,
 kobak@...dia.com, lcherian@...vell.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 peternewman@...gle.com, punit.agrawal@....qualcomm.com,
 quic_jiles@...cinc.com, reinette.chatre@...el.com, rohit.mathew@....com,
 scott@...amperecomputing.com, sdonthineni@...dia.com,
 tan.shaopeng@...itsu.com, xhao@...ux.alibaba.com, catalin.marinas@....com,
 will@...nel.org, corbet@....net, maz@...nel.org, oupton@...nel.org,
 joey.gouly@....com, suzuki.poulose@....com, kvmarm@...ts.linux.dev
Subject: Re: [PATCH v3 26/47] arm_mpam: resctrl: Wait for cacheinfo to be
 ready

Hi Jonathan,

On 1/13/26 15:01, Jonathan Cameron wrote:
> On Mon, 12 Jan 2026 16:58:53 +0000
> Ben Horgan <ben.horgan@....com> wrote:
> 
>> In order to calculate the rmid realloc threshold the size of the cache
>> needs to be known. Cache domains will also be named after the cache id. So
>> that this information can be extracted from cacheinfo we need to wait for
>> it to be ready. The cacheinfo information is populated in device_initcall()
>> so we wait for that.
>>
>> Signed-off-by: James Morse <james.morse@....com>
>> [horgan: split out from another patch]
>> Signed-off-by: Ben Horgan <ben.horgan@....com>
>> ---
>> This is moved into it's own patch to allow all uses of cacheinfo to be
>> valid when they are introduced.
> 
> I don't mind the patch but I'm not entirely following this comment. Is
> the point that previously there was a sneaky user before this was added in
> the series?

Yes, arm_mpam: resctrl: Add support for 'MB' resource, accesses
cacheinfo so wanted to order this patch before that.

> 
> Anyhow, that's not in the patch itself so
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>

Thanks,

Ben