netdev - Re: [PATCH v5 2/3] sched/topology: Introduce for_each_numa_hop

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Message-ID: <xhsmhilkdw9sj.mognet@vschneid.remote.csb>
Date:   Fri, 21 Oct 2022 15:06:36 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yury Norov <yury.norov@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mel Gorman <mgorman@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Gal Pressman <gal@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH v5 2/3] sched/topology: Introduce for_each_numa_hop_mask()

On 21/10/22 16:34, Andy Shevchenko wrote:
> On Fri, Oct 21, 2022 at 04:16:17PM +0300, Andy Shevchenko wrote:
>> On Fri, Oct 21, 2022 at 01:19:26PM +0100, Valentin Schneider wrote:
>
> ...
>
>> > +#define for_each_numa_hop_mask(mask, node)				     \
>> > +	for (unsigned int __hops = 0;					     \
>> > +	     /*								     \
>> > +	      * Unsightly trickery required as we can't both initialize	     \
>> > +	      * @mask and declare __hops in for()'s first clause	     \
>> > +	      */							     \
>> > +	     mask = __hops > 0 ? mask :					     \
>> > +		    node == NUMA_NO_NODE ?				     \
>> > +		    cpu_online_mask : sched_numa_hop_mask(node, 0),	     \
>> > +	     !IS_ERR_OR_NULL(mask);					     \
>>
>> > +	     __hops++,							     \
>> > +	     mask = sched_numa_hop_mask(node, __hops))
>>
>> This can be unified with conditional, see for_each_gpio_desc_with_flag() as
>> example how.
>
> Something like
>
>       mask = (__hops || node != NUMA_NO_NODE) ? sched_numa_hop_mask(node, __hops) : cpu_online_mask
>

That does simplify things somewhat, thanks!

> --
> With Best Regards,
> Andy Shevchenko