linux-kernel - Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture

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 for Android: free password hash cracker in your pocket

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

Message-ID: <88c17568-8694-940a-0f1f-9d345e8dcbdb@intel.com>
Date:   Thu, 22 Sep 2022 10:01:46 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     K Prateek Nayak <kprateek.nayak@....com>,
        linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-pm@...r.kernel.org, dave.hansen@...ux.intel.com,
        bp@...en8.de, tglx@...utronix.de, andi@...as.de, puwen@...on.cn,
        mario.limonciello@....com, peterz@...radead.org,
        rui.zhang@...el.com, gpiccoli@...lia.com,
        daniel.lezcano@...aro.org, ananth.narayan@....com,
        gautham.shenoy@....com, Calvin Ong <calvin.ong@....com>,
        stable@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors
 based on the Zen microarchitecture

On 9/22/22 09:54, K Prateek Nayak wrote:
> 
> On 9/22/2022 10:14 PM, Dave Hansen wrote:
>> On 9/20/22 23:36, K Prateek Nayak wrote:
>>> Cc: stable@...r.kernel.org
>>> Cc: regressions@...ts.linux.dev
>> *Is* this a regression?
> On second thought, it is not a regression.
> Will remove the tag on v2.

What were you planning for v2?

Rafael suggested something like the attached patch.  It's not nearly as
fragile as the Zen check you proposed earlier.

Any testing or corrections on the commentary would be appreciated.
View attachment "0001-ACPI-processor-idle-Limit-Dummy-wait-workaround-to-o.patch" of type "text/x-patch" (2918 bytes)