linux-kernel - Re: [PATCH 38/49] arch/powerpc: replace cpumask_weight with cpumask_weight

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Date:   Fri, 11 Feb 2022 15:10:02 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Yury Norov <yury.norov@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        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,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Parth Shah <parth@...ux.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Rob Herring <robh@...nel.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>,
        Sudeep Holla <sudeep.holla@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Xiongwei Song <sxwjean@...il.com>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 38/49] arch/powerpc: replace cpumask_weight with
 cpumask_weight_{eq, ...} where appropriate

Yury Norov <yury.norov@...il.com> writes:
> PowerPC code uses cpumask_weight() to compare the weight of cpumask with
> a given number. We can do it more efficiently with cpumask_weight_{eq, ...}
> because conditional cpumask_weight may stop traversing the cpumask earlier,
> as soon as condition is (or can't be)  met.
>
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>  arch/powerpc/kernel/smp.c      | 2 +-
>  arch/powerpc/kernel/watchdog.c | 2 +-
>  arch/powerpc/xmon/xmon.c       | 4 ++--
>  3 files changed, 4 insertions(+), 4 deletions(-)

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers