linux-kernel - Re: [PATCH 13/18] kernel: add kcompat_sys

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Message-ID: <20180515095351.lw5gxap4ii5iobtb@lakrids.cambridge.arm.com>
Date:   Tue, 15 May 2018 10:53:51 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, dave.martin@....com, james.morse@....com,
        linux-fsdevel@...r.kernel.org, marc.zyngier@....com,
        viro@...iv.linux.org.uk, will.deacon@....com
Subject: Re: [PATCH 13/18] kernel: add kcompat_sys_{f,}statfs64()

On Mon, May 14, 2018 at 10:34:14PM +0200, Dominik Brodowski wrote:
> On Mon, May 14, 2018 at 06:14:28PM +0100, Mark Rutland wrote:
> > On Mon, May 14, 2018 at 10:46:35AM +0100, Mark Rutland wrote:
> > > +#ifdef CONFIG_COMPAT
> > > +int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
> > > +		     struct compat_statfs64 __user * buf);
> > > +int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
> > > +			  struct compat_statfs64 __user * buf);
> > > +#endif
> > 
> > I've moved these to <linux/compat.h>, so that they live with the rest of
> > the compat syscall stuff. That should avoid build failures the kbuild
> > test robot picked up where compat_size_t wasn't dfined.
> 
> Please add a comment there, similar to what is in syscalls.h:
> 
> 	/*
> 	 * Kernel code should not call syscalls (i.e., sys_xyzyyz()) directly.
> 	 * Instead, use one of the functions which work equivalently, such as
> 	 * the ksys_xyzyyz() functions prototyped below.
> 	 */

To make the kcompat_sys_* naming scheme clearer, I've added compat references to
the above, i.e.

/*
 * Kernel code should not call compat syscalls (i.e., compat_sys_xyzyyz())
 * directly. Instead, use one of the functions which work equivalently, such
 * as the kcompat_sys_xyzyyz() functions prototyped below.
 */

> Once you have done so, feel free to add my
> 
> 	Reviewed-by: Dominik Brodowski <linux@...inikbrodowski.net>

I hope that this still stands with the changes above?

Thanks,
Mark.