linux-kernel - Re: [gcv v3 27/35] arm: Replace __get_cpu

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Message-ID: <00000140ee828138-3328099b-149e-433d-8262-0a481806ca85-000000@email.amazonses.com>
Date:	Thu, 5 Sep 2013 14:24:25 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Will Deacon <will.deacon@....com>
cc:	Tejun Heo <tj@...nel.org>,
	"akpm@...uxfoundation.org" <akpm@...uxfoundation.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [gcv v3 27/35] arm: Replace __get_cpu_var uses

On Thu, 5 Sep 2013, Will Deacon wrote:

> >
> >  	if (el == DBG_ACTIVE_EL1 &&
> > -	    local_dec_and_test(this_cpu_ptr(&kde_ref_count)))
> > +	    this_cpu_dec_return(kde_ref_count))
> >  		disable &= ~DBG_MDSCR_KDE;
>
> Almost! I think we just need an '== 0' check on the result from the
> decrement, since local_dec_and_test is simply a way to check that we've
> decremented to zero, so this patch would otherwise invert the meaning.

Ok can you take it from here and modify it? I have no build and test
environment set up for ARM.

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