linux-kernel - Re: [PATCH] x86: tell the world boot

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Message-ID: <554D022E.6090503@zytor.com>
Date:	Fri, 08 May 2015 11:36:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: tell the world boot_params is 16-byte aligned

On 05/08/2015 10:40 AM, Borislav Petkov wrote:
> On Fri, May 08, 2015 at 09:26:49AM -0700, H. Peter Anvin wrote:
>> NAK.  This could break in the case of careless bootloaders...
> 
> Please elaborate. You mean, they'll go with the max alignment too and
> search boot_params there?
> 

A careless bootloader may not align this data structure to any
particular alignment.

Of course, for x86 it doesn't matter too much, as it just hurts performance.

	-hpa

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