linux-kernel - Re: [PATCH 1/2] mm: Make follow_pte

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Date:   Tue, 19 Dec 2017 09:12:54 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, linux-mm@...ck.org,
        Josh Triplett <josh@...htriplett.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH 1/2] mm: Make follow_pte_pmd an inline

On Tue, Dec 19, 2017 at 09:05:42AM -0800, Joe Perches wrote:
> On Tue, 2017-12-19 at 08:58 -0800, Matthew Wilcox wrote:
> > +	/* (void) is needed to make gcc happy */
> > +	(void) __cond_lock(*ptlp,
> > +			   !(res = __follow_pte_pmd(mm, address, start, end,
> > +						    ptepp, pmdpp, ptlp)));
> 
> This seems obscure and difficult to read.  Perhaps:
> 
> 	res = __follow_pte_pmd(mm, address, start, end, ptepp, pmdpp, ptlp);
> 	(void)__cond_lock(*ptlp, !res);

Patch 1 moves the code.  Patch 2 cleans it up ;-)