linux-kernel - Re: mmots: memory-hotplug: implement register_page_bootmem_info

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 11 Jan 2013 11:29:24 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Wen Congyang <wency@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Wu Jianguo <wujianguo@...wei.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmots: memory-hotplug: implement
 register_page_bootmem_info_section of sparse-vmemmap fix

On Fri 11-01-13 11:17:45, Michal Hocko wrote:
[...]
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index be2b90c..59eddff 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -128,6 +128,64 @@ void __ref put_page_bootmem(struct page *page)
>  
>  }
>  
> +void register_page_bootmem_memmap(unsigned long section_nr,
> +				  struct page *start_page, unsigned long size)
> +{
> +	unsigned long addr = (unsigned long)start_page;
> +	unsigned long end = (unsigned long)(start_page + size);
> +	unsigned long next;
> +	pgd_t *pgd;
> +	pud_t *pud;
> +	pmd_t *pmd;
> +	unsigned int nr_pages;
> +	struct page *page;
> +
> +	for (; addr < end; addr = next) {
> +		pte_t *pte = NULL;
> +
> +		pgd = pgd_offset_k(addr);
> +		if (pgd_none(*pgd)) {
> +			next = (addr + PAGE_SIZE) & PAGE_MASK;
> +			continue;
> +		}
> +		get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
> +
> +		pud = pud_offset(pgd, addr);
> +		if (pud_none(*pud)) {
> +			next = (addr + PAGE_SIZE) & PAGE_MASK;
> +			continue;
> +		}
> +		get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
> +
> +		if (!cpu_has_pse) {

Darn! And now that I am looking at the patch closer it is too x86
centric so this cannot be in the generic code. I will try to cook
something better. Sorry about the noise.
[...]
-- 
Michal Hocko
SUSE Labs
--
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/