linux-kernel - Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

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Date:	Tue, 13 Aug 2013 09:43:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, xemul@...allels.com, mpm@...enic.com,
	xiaoguangrong@...ux.vnet.ibm.com, mtosatti@...hat.com,
	kosaki.motohiro@...il.com, sfr@...b.auug.org.au,
	peterz@...radead.org, aneesh.kumar@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

On 08/13/2013 08:37 AM, Cyrill Gorcunov wrote:
>>
>> Does it actually matter, generated-code-wise, or is the compiler smart
>> enough to figure it out?  The reason I'm asking is because it makes the
> 
> gcc-4.7.2 is smart enough to suppress useless masking (ie ((1u << 31) - 1))
> completely but I don't know if this can be assumed for all gcc series.
> 

I would be highly surprised if it wasn't the case for any gcc we care about.

	-hpa


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