linux-kernel - Re: [PATCH v4 7/8] linux/log2.h: Fix 64bit calculations in roundup/down_pow

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Message-ID: <20191204141725.GA4939@unreal>
Date:   Wed, 4 Dec 2019 16:17:25 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     andrew.murray@....com, maz@...nel.org,
        linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Emilio López <emilio@...pez.com.ar>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Mirko Lindner <mlindner@...vell.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Martin Habets <mhabets@...arflare.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        james.quinlan@...adcom.com, mbrugger@...e.com,
        f.fainelli@...il.com, phil@...pberrypi.org, wahrenst@....net,
        jeremy.linton@....com, linux-pci@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        Robin Murphy <robin.murphy@....con>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "David S. Miller" <davem@...emloft.net>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rdma@...r.kernel.org, iommu@...ts.linux-foundation.org,
        netdev@...r.kernel.org, kexec@...ts.infradead.org,
        linux-nfs@...r.kernel.org
Subject: Re: [PATCH v4 7/8] linux/log2.h: Fix 64bit calculations in
 roundup/down_pow_two()

On Tue, Dec 03, 2019 at 12:47:40PM +0100, Nicolas Saenz Julienne wrote:
> Some users need to make sure their rounding function accepts and returns
> 64bit long variables regardless of the architecture. Sadly
> roundup/rounddown_pow_two() takes and returns unsigned longs. It turns
> out ilog2() already handles 32/64bit calculations properly, and being
> the building block to the round functions we can rework them as a
> wrapper around it.
>
> Suggested-by: Robin Murphy <robin.murphy@....con>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>  drivers/clk/clk-divider.c                    |  8 ++--
>  drivers/clk/sunxi/clk-sunxi.c                |  2 +-
>  drivers/infiniband/hw/hfi1/chip.c            |  4 +-
>  drivers/infiniband/hw/hfi1/init.c            |  4 +-
>  drivers/infiniband/hw/mlx4/srq.c             |  2 +-
>  drivers/infiniband/hw/mthca/mthca_srq.c      |  2 +-
>  drivers/infiniband/sw/rxe/rxe_qp.c           |  4 +-


Thanks, for infiniband.
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>