On 04/16/2013 11:37 AM, Dave Hansen wrote: > Instead of bothering to store the index, why not just calculate it, like: > > On 04/15/2013 08:37 PM, zhang.y...@zte.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.
And with this it would no longer be necessary to store this index at all, eliminating all changes to the MM other than this accessor function - which if not needed there could be added to futex.c, or even replaced with "page_head - page" in get_futex_key() right? -- Darren Hart Intel Open Source Technology Center Yocto Project - Technical Lead - Linux Kernel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/