linux-kernel - Re: [PATCH V5 04/25] perf/x86/intel: Hybrid PMU support for perf capabilities

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]

Date:   Thu, 8 Apr 2021 19:00:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org, acme@...nel.org,
        tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
        ricardo.neri-calderon@...ux.intel.com
Subject: Re: [PATCH V5 04/25] perf/x86/intel: Hybrid PMU support for perf
 capabilities

On Mon, Apr 05, 2021 at 08:10:46AM -0700, kan.liang@...ux.intel.com wrote:
> +#define is_hybrid()			(!!x86_pmu.num_hybrid_pmus)

Given this is sprinkled all over the place, can you make this a
static_key_false + static_branch_unlikely() such that the hybrid case is
out-of-line?