linux-kernel - RE: [PATCH] x86/resctrl: avoid compiler optimization in __resctrl_sched

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Message-ID: <SJ1PR11MB60835681E8FE389EC0A1825DFCB79@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Tue, 7 Mar 2023 21:35:12 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Torvalds, Linus" <torvalds@...ux-foundation.org>,
        Jakub Jelinek <jakub@...hat.com>
CC:     Segher Boessenkool <segher@...nel.crashing.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Eranian, Stephane" <eranian@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "peternewman@...gle.com" <peternewman@...gle.com>,
        "james.morse@....com" <james.morse@....com>,
        "babu.moger@....com" <babu.moger@....com>,
        "ananth.narayan@....com" <ananth.narayan@....com>,
        "vschneid@...hat.com" <vschneid@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-toolchains@...r.kernel.org" <linux-toolchains@...r.kernel.org>
Subject: RE: [PATCH] x86/resctrl: avoid compiler optimization in
 __resctrl_sched_in

> Ok, so here's a *ttoally* untested and mindless patch to maybe fix
> what I dislike about that resctl code.
>
> Does it fix the code generation issue? I have no idea. But this is
> what I would suggest is the right answer, without actually knowing the
> code any better, and just going on a mindless rampage.
>
> It seems to compile for me, fwiw.

Beyond compiling it boots and passes the tools/testing/selftests/resctrl test suite.

Tested-by: Tony Luck <tony.luck@...el.com>

-Tony