linux-kernel - Re: [PATCH v2 05/17] compat_ioctl: move more drivers to generic_compat_ioctl

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Message-ID: <20180918175108.GF35251@wrath>
Date:   Tue, 18 Sep 2018 10:51:08 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-fsdevel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        qat-linux@...el.com, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, amd-gfx@...ts.freedesktop.org,
        linux-input@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-btrfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 05/17] compat_ioctl: move more drivers to
 generic_compat_ioctl_ptrarg

On Fri, Sep 14, 2018 at 09:57:48PM +0100, Al Viro wrote:
> On Fri, Sep 14, 2018 at 01:35:06PM -0700, Darren Hart wrote:
>  
> > Acked-by: Darren Hart (VMware) <dvhart@...radead.org>
> > 
> > As for a longer term solution, would it be possible to init fops in such
> > a way that the compat_ioctl call defaults to generic_compat_ioctl_ptrarg
> > so we don't have to duplicate this boilerplate for every ioctl fops
> > structure?
> 
> 	Bad idea, that...  Because several years down the road somebody will add
> an ioctl that takes an unsigned int for argument.  Without so much as looking
> at your magical mystery macro being used to initialize file_operations.

Fair, being explicit in the declaration as it is currently may be
preferable then.

-- 
Darren Hart
VMware Open Source Technology Center