linux-kernel - Re: + drivers-acpi-apei-erst-dbgc-get_useru64-doesnt-work-on-i386.patch added to -mm tree

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Message-ID: <4C638140.1080202@zytor.com>
Date:	Wed, 11 Aug 2010 22:06:08 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, gcosta@...hat.com, lenb@...nel.org,
	mingo@...e.hu, tglx@...utronix.de, ying.huang@...el.com,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: + drivers-acpi-apei-erst-dbgc-get_useru64-doesnt-work-on-i386.patch
 added to -mm tree

On 08/11/2010 09:30 PM, Andrew Morton wrote:
> 
> It occurs so rarely that it's probably not worth bothering about, IMO.
> 

I think the real question is if we want people to convert:

	if (copy_from_user(foo, bar, sizeof *foo))
		return -EFAULT;

... into ...

	if (get_user(*foo, bar))
		return -EFAULT;

... or ...

	rv = get_user(*foo, bar);
	if (rv)
		return rv;

... where *foo is a structure type.  It does have the advantage that a
single API does everything, simple or not, but has the disadvantage that
the partial-access semantics are now less explicit.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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