From: "H. Peter Anvin" <hpa@zytor.com>
To: Adrian Bunk <bunk@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Mike Frysinger <vapier@gentoo.org>,
tglx@linutronix.de, mingo@redhat.com,
Andi Kleen <andi@firstfloor.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: asm-x86/byteorder.h: clean up for userspace
Date: Tue, 01 Jan 2008 18:22:24 -0800 [thread overview]
Message-ID: <477AF560.1000002@zytor.com> (raw)
In-Reply-To: <20080102013126.GN27566@does.not.exist>
Adrian Bunk wrote:
>
> Userspace either has to #define CONFIG_X86_BSWAP or it'll get the slow
> versions of these functions...
>
> Leaking CONFIG_ variables to userspace is not really funny - I remember
> e.g. what tricks MySQL does (did?) for (ab)using asm-i386/atomic.h in
> userspace.
>
True. CONFIG_X86_BSWAP isn't appropriate for userspace anyway,
userspace needs to use the appropriate gcc intrinsics for 486+.
-hpa
prev parent reply other threads:[~2008-01-02 2:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-31 18:12 asm-x86/byteorder.h: clean up for userspace Mike Frysinger
2008-01-01 15:22 ` Ingo Molnar
2008-01-01 17:47 ` Christoph Hellwig
2008-01-01 18:17 ` Mike Frysinger
2008-01-01 21:19 ` H. Peter Anvin
2008-01-02 1:31 ` Adrian Bunk
2008-01-02 2:22 ` H. Peter Anvin [this message]
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