linux-kernel - Re: [RFCv2 03/10] x86: Introduce userspace API to handle per-thread features

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Date:   Fri, 13 May 2022 16:09:05 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv2 03/10] x86: Introduce userspace API to handle per-thread features

> +
> +       /* Handle ARCH_THREAD_FEATURE_ENABLE */
> +
> +       task->thread.features |= features;
> +out:
> +       return task->thread.features;
Isn't arch_prctl() supposed to return 0 on success?