linux-kernel - Re: [PATCH] tell gcc optimizer to never introduce new data races

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Message-ID: <20140610150455.GC7335@redhat.com>
Date:	Tue, 10 Jun 2014 17:04:55 +0200
From:	Marek Polacek <polacek@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Jambor <mjambor@...e.cz>, Petr Mladek <pmladek@...e.cz>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: [PATCH] tell gcc optimizer to never introduce new data races

On Tue, Jun 10, 2014 at 04:53:27PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 10, 2014 at 03:23:36PM +0200, Jiri Kosina wrote:
> > +# Tell gcc to never replace conditional load with a non-conditional one
> > +KBUILD_CFLAGS	+= $(call cc-option,--param allow-store-data-races=0)
> > +
> 
> Why do we not want: -fmemory-model=safe? And should we not at the very
> least also disable packed-store-data-races?

Note that the option does not exist, even though it is mentioned in the
documentation.

	Marek
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