linux-kernel - Re: [PATCH v2] x86, boot: Fix word-size assumptions in has

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Date:	Thu, 30 Jan 2014 15:01:02 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	David Woodhouse <dwmw2@...radead.org>
cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>, tglx@...utronix.de,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Subject: Re: [PATCH v2] x86, boot: Fix word-size assumptions in has_eflag ()
 inline asm

On Thu, 30 Jan 2014, David Woodhouse wrote:

> Commit dd78b97367bd575918204cc89107c1479d3fc1a7 ("x86, boot: Move CPU
> flags out of cpucheck") introduced ambiguous inline asm in the
> has_eflag() function. In 16-bit mode want the instruction to be
> 'pushfl', but we just say 'pushf' and hope the compiler does what we
> wanted.
> 
> When building with 'clang -m16', it won't, because clang doesn't use
> the horrid '.code16gcc' hack that even 'gcc -m16' uses internally.
> 
> Say what we mean and don't make the compiler make assumptions.
> 
> Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>

Fixes the x86-build-for-linus build error for me, thanks!
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