linux-kernel - Re: [RFC] x86: Disable traditional FPU instructions too

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Message-ID: <52E69464.4010705@zytor.com>
Date:	Mon, 27 Jan 2014 09:16:20 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>, Jiri Kosina <jkosina@...e.cz>
CC:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Matz <matz@...e.de>, Michal Hocko <mhocko@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] x86: Disable traditional FPU instructions too

On 01/27/2014 09:01 AM, Andi Kleen wrote:
> Jiri Kosina <jkosina@...e.cz> writes:
> 
>> On Mon, 27 Jan 2014, H. Peter Anvin wrote:
>>
>>> I don't think it'd hurt... although I think the above pretty much
>>> requires that the code contain actual floating-point types to ever be
>>> generated.  
>>
>> Unfortunately using float-typed constants (such as 1EexpL) are enough for 
>> this to happen.
> 
> checkpatch would seem to be the right place to check for this?
> 

Ideally gcc should have a -no-float option...

	-hpa


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