linux-kernel - Re: [PATCH] x86, cpuinfo x86_model

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Message-ID: <5565FC7E.7080805@zytor.com>
Date:	Wed, 27 May 2015 10:18:54 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Igor Mammedov <imammedo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Prarit Bhargava <prarit@...hat.com>
Subject: Re: [PATCH] x86, cpuinfo x86_model_id whitespace cleanup

On 05/19/2015 12:22 PM, Borislav Petkov wrote:
> 
> I guess I'm trying to find out why don't we have a BIG FAT WARNING over
> memcpy saying not to use it with overlapping buffers and larger than
> byte sizes. Or maybe this is something everyone, except me, just knows
> and that's a "Doh, Boris, of course!".
> 

It kind of is, and doesn't just apply to kernel programming.  In C99+
the memcpy() prototype has "restrict" in it to denote that memcpy()
buffers have to be non-overlapping.

	-hpa


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