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

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Message-ID: <20220513230958.dbxp6m3y3lnq74qb@black.fi.intel.com>
Date:   Sat, 14 May 2022 02:09:58 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc:     "glider@...gle.com" <glider@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "hjl.tools@...il.com" <hjl.tools@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "aryabinin@...tuozzo.com" <aryabinin@...tuozzo.com>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Lutomirski, Andy" <luto@...nel.org>
Subject: Re: [RFCv2 03/10] x86: Introduce userspace API to handle per-thread
 features

On Fri, May 13, 2022 at 05:34:12PM +0000, Edgecombe, Rick P wrote:
> On Fri, 2022-05-13 at 16:09 +0200, Alexander Potapenko wrote:
> > > +
> > > +       /* Handle ARCH_THREAD_FEATURE_ENABLE */
> > > +
> > > +       task->thread.features |= features;
> > > +out:
> > > +       return task->thread.features;
> > 
> > Isn't arch_prctl() supposed to return 0 on success?
> 
> Hmm, good point. Maybe we'll need a struct to pass info in and out.

But values >0 are unused. I don't see why can't we use them.

-- 
 Kirill A. Shutemov