linux-kernel - Re: [PATCH] x86-32: Fix alignment of alternative instruction entries

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Date:	Wed, 21 Sep 2011 12:06:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ben Hutchings <ben@...adent.org.uk>
cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andres Salomon <dilinger@...ued.net>,
	Andy Lutomirski <luto@....edu>,
	Arnaud Lacombe <lacombar@...il.com>
Subject: Re: [PATCH] x86-32: Fix alignment of alternative instruction
 entries

On Wed, 21 Sep 2011, Ben Hutchings wrote:

> The altinstruction_entry macro was originally used only on x86-64,
> and assumed 64-bit pointers and alignment.
> 
> Commit b4ca46e4e82a0a5976fe5eab85be585d75f8202f ("x86-32: Fix boot
> with CONFIG_X86_INVD_BUG") introduced a use of the macro on x86-32.
> Before this, the 64-bit pointers had been replaced by 32-bit offsets,
> so it worked - in at least one case.  However, the alignment is still
> wrong for x86-32, which can result in zero-padding between entries and
> a BUG in apply_alternatives.

Fixed in Linus tree already: commit a7f934d4f16144cb

Thanks,

	tglx
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