From: Yury Norov <yury.norov@gmail.com>
To: Valentin Schneider <vschneid@redhat.com>
Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org, Saeed Mahameed <saeedm@nvidia.com>,
Leon Romanovsky <leon@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Mel Gorman <mgorman@suse.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Heiko Carstens <hca@linux.ibm.com>,
Tony Luck <tony.luck@intel.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Gal Pressman <gal@nvidia.com>, Tariq Toukan <tariqt@nvidia.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>
Subject: Re: [PATCH v4 2/7] cpumask: Introduce for_each_cpu_andnot()
Date: Tue, 27 Sep 2022 13:02:30 -0700 [thread overview]
Message-ID: <YzNW1su5pcO5SLIW@yury-laptop> (raw)
In-Reply-To: <xhsmhill84vhr.mognet@vschneid.remote.csb>
On Tue, Sep 27, 2022 at 05:45:04PM +0100, Valentin Schneider wrote:
> On 25/09/22 08:23, Yury Norov wrote:
> > On Fri, Sep 23, 2022 at 04:55:37PM +0100, Valentin Schneider wrote:
> >> +/**
> >> + * for_each_cpu_andnot - iterate over every cpu present in one mask, excluding
> >> + * those present in another.
> >> + * @cpu: the (optionally unsigned) integer iterator
> >> + * @mask1: the first cpumask pointer
> >> + * @mask2: the second cpumask pointer
> >> + *
> >> + * This saves a temporary CPU mask in many places. It is equivalent to:
> >> + * struct cpumask tmp;
> >> + * cpumask_andnot(&tmp, &mask1, &mask2);
> >> + * for_each_cpu(cpu, &tmp)
> >> + * ...
> >> + *
> >> + * After the loop, cpu is >= nr_cpu_ids.
> >> + */
> >> +#define for_each_cpu_andnot(cpu, mask1, mask2) \
> >> + for ((cpu) = -1; \
> >> + (cpu) = cpumask_next_andnot((cpu), (mask1), (mask2)), \
> >> + (cpu) < nr_cpu_ids;)
> >
> > This would raise cpumaks_check() warning at the very last iteration.
> > Because cpu is initialized insize the loop, you don't need to check it
> > at all. You can do it like this:
> >
> > #define for_each_cpu_andnot(cpu, mask1, mask2) \
> > for_each_andnot_bit(...)
> >
> > Check this series for details (and please review).
> > https://lore.kernel.org/all/20220919210559.1509179-8-yury.norov@gmail.com/T/
> >
>
> Thanks, I'll have a look.
Also, if you send first 4 patches as a separate series on top of
bitmap-for-next, I'll be able to include them in bitmap-for-next
and then in 6.1 pull-request.
Thanks,
Yury
next prev parent reply other threads:[~2022-09-27 20:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-23 13:25 [PATCH v4 0/7] sched, net: NUMA-aware CPU spreading interface Valentin Schneider
2022-09-23 13:25 ` [PATCH v4 1/7] lib/find_bit: Introduce find_next_andnot_bit() Valentin Schneider
2022-09-23 15:44 ` [PATCH v4 0/7] sched, net: NUMA-aware CPU spreading interface Yury Norov
2022-09-23 15:49 ` Valentin Schneider
2022-09-23 15:55 ` [PATCH v4 2/7] cpumask: Introduce for_each_cpu_andnot() Valentin Schneider
2022-09-25 15:23 ` Yury Norov
2022-09-27 16:45 ` Valentin Schneider
2022-09-27 20:02 ` Yury Norov [this message]
2022-09-23 15:55 ` [PATCH v4 3/7] lib/test_cpumask: Add for_each_cpu_and(not) tests Valentin Schneider
2022-09-23 15:55 ` [PATCH v4 4/7] sched/core: Merge cpumask_andnot()+for_each_cpu() into for_each_cpu_andnot() Valentin Schneider
2022-09-23 15:55 ` [PATCH v4 5/7] sched/topology: Introduce sched_numa_hop_mask() Valentin Schneider
2022-09-25 15:00 ` Yury Norov
2022-09-25 15:24 ` Yury Norov
2022-09-27 16:45 ` Valentin Schneider
2022-09-27 19:30 ` Yury Norov
2022-09-25 18:05 ` Yury Norov
2022-09-25 18:13 ` Yury Norov
2022-09-27 16:45 ` Valentin Schneider
2022-09-23 15:55 ` [PATCH v4 6/7] sched/topology: Introduce for_each_numa_hop_cpu() Valentin Schneider
2022-09-25 14:58 ` Yury Norov
2022-09-27 16:45 ` Valentin Schneider
2022-09-23 15:55 ` [PATCH v4 7/7] net/mlx5e: Improve remote NUMA preferences used for the IRQ affinity hints Valentin Schneider
2022-09-25 7:48 ` [PATCH v4 0/7] sched, net: NUMA-aware CPU spreading interface Tariq Toukan
2022-10-18 6:36 ` Tariq Toukan
2022-10-18 16:50 ` Valentin Schneider
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