linux-kernel - Re: [PATCH 18/54] drivers/infiniband: replace cpumask_weight with cpumask

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Message-ID: <Ye2ovL0UwQ2X4w7z@unreal>
Date:   Sun, 23 Jan 2022 21:13:00 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Laight <David.Laight@...lab.com>,
        Joe Perches <joe@...ches.com>, Dennis Zhou <dennis@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Nicholas Piggin <npiggin@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Alexey Klimov <aklimov@...hat.com>,
        linux-kernel@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org
Subject: Re: [PATCH 18/54] drivers/infiniband: replace cpumask_weight with
 cpumask_empty where appropriate

On Sun, Jan 23, 2022 at 10:38:49AM -0800, Yury Norov wrote:
> drivers/infiniband/hw/hfi1/affinity.c code calls cpumask_weight() to check
> if any bit of a given cpumask is set. We can do it more efficiently with
> cpumask_empty() because cpumask_empty() stops traversing the cpumask as
> soon as it finds first set bit, while cpumask_weight() counts all bits
> unconditionally.
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>  drivers/infiniband/hw/hfi1/affinity.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Except that title needs to be: "RDMA/hfi: ....", the change looks ok.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>