linux-kernel - Re: [PATCH 1/2] mtd: mtdchar.c silence sparse warning

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Date:	Thu, 15 May 2008 02:46:00 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mtd: mtdchar.c silence sparse warning

On Wed, May 14, 2008 at 06:38:37PM -0700, Andrew Morton wrote:
> > -		if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
> > +		if (copy_to_user(argp + offsetof(struct mtd_oob_buf, length),
> >  				 &retlen, sizeof(buf.length)))
> >  			ret = -EFAULT;
> 
> Cleaner would be:
> 
> 	struct mtd_oob_buf __user *user_mtd_oob_buf = argp;
> 
> 	if (copy_to_user(&user_mtd_oob_buf->length, ...

Yup.  BTW, &((type __user *)p)->field) would work just fine too, but yeah,
local variable like that would be cleaner.
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