linux-kernel - Re: [PATCH 05 of 66] compound

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Message-ID: <AANLkTik9U_r7tqdDYw24xwTgvp5c740Z9eMQeh8y4Hpi@mail.gmail.com>
Date:	Thu, 18 Nov 2010 09:28:27 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 05 of 66] compound_lock

On Thu, Nov 18, 2010 at 3:49 AM, Mel Gorman <mel@....ul.ie> wrote:
>> +
>> +static inline void compound_lock_irqsave(struct page *page,
>> +                                      unsigned long *flagsp)
>> +{
>> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> +     unsigned long flags;
>> +     local_irq_save(flags);
>> +     compound_lock(page);
>> +     *flagsp = flags;
>> +#endif
>> +}
>> +
>
> The pattern for spinlock irqsave passes in unsigned long, not unsigned
> long *. It'd be nice if they matched.

Indeed. Just make the thing return the flags the way the normal
spin_lock_irqsave() function does.

                  Linus
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