linux-kernel - Re: [PATCH] jump_label: unlikely(x)

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Message-ID: <20131016064659.GA22509@gmail.com>
Date:	Wed, 16 Oct 2013 08:46:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Roel Kluin <roel.kluin@...il.com>,
	Andrew Jones <drjones@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] jump_label: unlikely(x) > 0


* H. Peter Anvin <hpa@...ux.intel.com> wrote:

> On 10/11/2013 01:57 PM, Andrew Morton wrote:
> > 
> > I'm sure this was intended instead ;) The patch doesn't seem to make
> > any difference in code generation with my gcc.
> > 
> 
> Which is odd, because doesn't unlikely() booleanize?

It's supposed to:

 include/linux/compiler.h:#define unlikely_notrace(x)    __builtin_expect(!!(x), 0)

Thanks,

	Ingo
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