linux-kernel - Re: [PATCHv4] mm: Don't offset memmap for flatmem

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] [day] [month] [year] [list]

Message-ID: <56414993.8070709@labbott.name>
Date:	Mon, 9 Nov 2015 17:34:11 -0800
From:	Laura Abbott <laura@...bott.name>
To:	Tony Luck <tony.luck@...il.com>,
	Laura Abbott <labbott@...oraproject.org>
Cc:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Russell King <rmk@....linux.org.uk>,
	Kevin Hilman <khilman@...aro.org>,
	Arnd Bergman <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	Mel Gorman <mgorman@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCHv4] mm: Don't offset memmap for flatmem

On 11/9/15 3:20 PM, Tony Luck wrote:
>> @@ -4984,9 +4987,9 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
>>           */
>>          if (pgdat == NODE_DATA(0)) {
>>                  mem_map = NODE_DATA(0)->node_mem_map;
>> -#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
>> +#if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM)
>>                  if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
>> -                       mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
>> +                       mem_map -= offset;
>>   #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>          }
>>   #endif
>
> This piece breaks ia64.  See the comment earlier in the function
> that "ia64 gets its own node_mem_map" ... so we skip the initialization
> of offset ... and arrive down here and just subtract "0" from mem_map.
>
> Attached patch fixes ia64 ... does ARM still work if this is applied?
>
> -Tony
>

Yes, this still fixes the problem for me. I see the pfn <-> page
translation working as expected.

Tested-by: Laura Abbott <laura@...bott.name>

Thanks,
Laura
--
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/