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

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Message-ID: <20140128093701.GC2221@dhcp22.suse.cz>
Date:	Tue, 28 Jan 2014 10:37:01 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Kosina <jkosina@...e.cz>, Michael Matz <matz@...e.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [RFC] x86: Disable traditional FPU instructions too

[CCing Ralf for MIPS.]

On Mon 27-01-14 17:45:44, Borislav Petkov wrote:
> On Mon, Jan 27, 2014 at 08:41:09AM -0800, 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.
> 
> Yes, that is supposed to catch usage of the 'E' floating constant, for
> example, in definitions. It is a build-time assertion, if you want. :)

And git grep says that mips abuses this notation:
arch/mips/include/asm/kvm_host.h:#define MS_TO_NS(x) (x * 1E6L)

I do not have cross-compiler set up to check whether this is a real
issue because include/media/rc-core.h defines the same macro correctly
so the real code might end up using the right variant.
-- 
Michal Hocko
SUSE Labs
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