linux-kernel - Re: [PATCH v3 1/7] linux/log2.h: Add roundup/rounddown_pow

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Message-ID: <20191126125137.GA10331@unreal>
Date:   Tue, 26 Nov 2019 14:51:37 +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,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        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,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        devicetree@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH v3 1/7] linux/log2.h: Add roundup/rounddown_pow_two64()
 family of functions

On Tue, Nov 26, 2019 at 10:19:39AM +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. Create a
> new generic 64bit variant of the function and cleanup rougue custom
> implementations.

Is it possible to create general roundup/rounddown_pow_two() which will
work correctly for any type of variables, instead of creating special
variant for every type?

Thanks