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Message-ID: <50DA6CDC.4050101@cn.fujitsu.com> Date: Wed, 26 Dec 2012 11:19:56 +0800 From: Tang Chen <tangchen@...fujitsu.com> To: Jianguo Wu <wujianguo@...wei.com> CC: akpm@...ux-foundation.org, rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com, benh@...nel.crashing.org, paulus@...ba.org, cl@...ux.com, minchan.kim@...il.com, kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com, wency@...fujitsu.com, hpa@...or.com, linfeng@...fujitsu.com, laijs@...fujitsu.com, mgorman@...e.de, yinghai@...nel.org, x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org, linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, linux-ia64@...r.kernel.org, cmetcalf@...era.com, sparclinux@...r.kernel.org Subject: Re: [PATCH v5 08/14] memory-hotplug: Common APIs to support page tables hot-remove On 12/26/2012 11:11 AM, Tang Chen wrote: > On 12/26/2012 10:49 AM, Tang Chen wrote: >> On 12/25/2012 04:17 PM, Jianguo Wu wrote: >>>> + >>>> +static void __meminit free_pagetable(struct page *page, int order) >>>> +{ >>>> + struct zone *zone; >>>> + bool bootmem = false; >>>> + unsigned long magic; >>>> + >>>> + /* bootmem page has reserved flag */ >>>> + if (PageReserved(page)) { >>>> + __ClearPageReserved(page); >>>> + bootmem = true; >>>> + >>>> + magic = (unsigned long)page->lru.next; >>>> + if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) > > And also, I think we don't need to check MIX_SECTION_INFO since it is > for the pageblock_flags, not the memmap in the section. Oh, no :) We also need to check MIX_SECTION_INFO because we set pgd, pud, pmd pages as MIX_SECTION_INFO in register_page_bootmem_memmap() in patch6. Thanks. :) > > Thanks. :) > >>>> + put_page_bootmem(page); >>> >>> Hi Tang, >>> >>> For removing memmap of sparse-vmemmap, in cpu_has_pse case, if magic >>> == SECTION_INFO, >>> the order will be get_order(PMD_SIZE), so we need a loop here to put >>> all the 512 pages. >>> >> Hi Wu, >> >> Thanks for reminding me that. I truely missed it. >> >> And since in register_page_bootmem_info_section(), a whole memory >> section will be set as SECTION_INFO, I think we don't need to check >> the page magic one by one, just the first one is enough. :) >> >> I will fix it, thanks. :) >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >> the body of a message to majordomo@...r.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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