linux-kernel - Re: [PATCH v2 1/5] smp: don't declare nr_cpu_ids if NR

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Message-ID: <Yxdgrbvtv36C4zcJ@smile.fi.intel.com>
Date:   Tue, 6 Sep 2022 18:01:01 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Yury Norov <yury.norov@...il.com>, linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Sander Vanheule <sander@...nheule.net>,
        Alexey Klimov <klimov.linux@...il.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH v2 1/5] smp: don't declare nr_cpu_ids if NR_CPUS == 1

On Tue, Sep 06, 2022 at 04:36:39PM +0200, Peter Zijlstra wrote:
> On Tue, Sep 06, 2022 at 07:06:31AM -0700, Yury Norov wrote:
> > On Tue, Sep 06, 2022 at 10:53:53AM +0200, Peter Zijlstra wrote:
> > > On Mon, Sep 05, 2022 at 04:08:16PM -0700, Yury Norov wrote:

...

> > > Why do we need extra source complexity for this?
> > 
> > To have effective code generation for UP builds.
> 
> Again, who cares... isn't it hard to find actual UP chips these days?

For the record, Intel produced somewhat a volume of Intel Quark chips [1],
that are UP (in 2013-2019).

[1]: https://en.wikipedia.org/wiki/Intel_Quark

-- 
With Best Regards,
Andy Shevchenko