linux-kernel - Re: [PATCH v4 0/5] x86: Cleanup and simplify cpu-specific data

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Date:	Tue, 28 Feb 2012 09:24:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kevin Winchester <kjwinchester@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Randy Dunlap <rdunlap@...otime.net>,
	Nick Bowler <nbowler@...iptictech.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/5] x86: Cleanup and simplify cpu-specific data


* H. Peter Anvin <hpa@...or.com> wrote:

> >In function ‘copy_from_user’,
> >     inlined from ‘pktgen_if_write’ at net/core/pktgen.c:877:20:
> >/home/kevin/linux/linux-2.6/arch/x86/include/asm/uaccess_32.h:211:26:
> >error: call to ‘copy_from_user_overflow’ declared with attribute
> >error: copy_from_user() buffer size is not provably correct
> >make[2]: *** [net/core/pktgen.o] Error 1
> >
> >On:
> >
> >gcc (GCC) 4.6.2 20120120 (prerelease)
> >
> >Is that my fault, or something else?
> >
> >Kevin
> >
> 
> That comes from compiling with warnings as errors.  Not that someone
> shouldn't look at that kind of problem.

Can probably be worked around by disabling:

CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

Thanks,

	Ingo
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