linux-kernel - Re: [PATCH 06/11] mm: frontswap: make all branches of if statement in put page consistent

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Message-ID: <20120607183022.GA9472@phenom.dumpdata.com>
Date:	Thu, 7 Jun 2012 14:30:22 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	dan.magenheimer@...cle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/11] mm: frontswap: make all branches of if statement
 in put page consistent

On Wed, Jun 06, 2012 at 12:55:10PM +0200, Sasha Levin wrote:
> Currently it has a complex structure where different things are compared
> at each branch. Simplify that and make both branches look similar.
> 
> Signed-off-by: Sasha Levin <levinsasha928@...il.com>
> ---
>  mm/frontswap.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/frontswap.c b/mm/frontswap.c
> index 618ef91..f2f4685 100644
> --- a/mm/frontswap.c
> +++ b/mm/frontswap.c
> @@ -119,16 +119,16 @@ int __frontswap_put_page(struct page *page)
>  		frontswap_succ_puts++;
>  		if (!dup)
>  			atomic_inc(&sis->frontswap_pages);
> -	} else if (dup) {
> +	} else {
>  		/*
>  		  failed dup always results in automatic invalidate of
>  		  the (older) page from frontswap
>  		 */
> -		frontswap_clear(sis, offset);
> -		atomic_dec(&sis->frontswap_pages);
> -		frontswap_failed_puts++;

Hmm, you must be using an older branch b/c the frontswap_failed_puts++
doesn't exist anymore. Could you rebase on top of linus/master please.

> -	} else {
>  		frontswap_failed_puts++;
> +		if (dup) {
> +			frontswap_clear(sis, offset);
> +			atomic_dec(&sis->frontswap_pages);
> +		}
>  	}
>  	if (frontswap_writethrough_enabled)
>  		/* report failure so swap also writes to swap device */
> -- 
> 1.7.8.6
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