linux-kernel - Re: bit fields && data tearing

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Message-ID: <20140904122901.GA17454@tucnak.redhat.com>
Date:	Thu, 4 Sep 2014 14:29:01 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Mikael Pettersson <mikpelinux@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Richard Henderson <rth@...ddle.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Miroslav Franc <mfranc@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	linux-ia64@...r.kernel.org
Subject: Re: bit fields && data tearing

On Thu, Sep 04, 2014 at 08:24:12AM -0400, Peter Hurley wrote:
> And I just confirmed with the Alpha cross-compiler that the fields are
> not 'padded out' if volatile either.

They can't be, struct layout is part of the ABI.
Guess you can introduce say atomic_bool and similar typedefs which would be
bool or char on most arches and on alpha int.

	Jakub
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