linux-kernel - Re: [patch] use __asm__ and __volatile_

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Message-ID: <4676C78D.8040208@zytor.com>
Date:	Mon, 18 Jun 2007 10:57:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Robert Hancock <hancockr@...w.ca>
CC:	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Mike Frysinger <vapier@...too.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	rmk@....linux.org.uk
Subject: Re: [patch] use __asm__ and __volatile__ in i386/arm/s390 byteorder.h

Robert Hancock wrote:
> 
> If we expect userspace apps to include them, then I would vote for no,
> not for anything outside of #ifdef __KERNEL__ in exported headers. Keep
> in mind also that C++ apps may need to include these as well and those
> extensions don't always play well in C++ mode. (Last instance I ran into
> was the ioctl argument checking macros _IOR, _IOW, etc. that create
> non-compiling code if you use them in a C++ program.)
> 

Some of the actual ioctl macros generate silently wrong code if you use
them in a C program.

	-hpa
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