linux-kernel - Re: [PATCH] futex: bugfix for futex-key conflict when futex use hugepage

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Date:	Tue, 16 Apr 2013 11:37:40 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	zhang.yi20@....com.cn
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Peter Zijlstra <peterz@...radead.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] futex: bugfix for futex-key conflict when futex use hugepage

Instead of bothering to store the index, why not just calculate it, like:

On 04/15/2013 08:37 PM, zhang.yi20@....com.cn wrote:
> +static inline int get_page_compound_index(struct page *page)
> +{
> +       if (PageHead(page))
> +               return 0;
> +       return compound_head(page) - page;
> +}

BTW, you've really got to get your mail client fixed.  Your patch is
still line-wrapped.
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