linux-kernel - Re: [PATCH 04/12] mm: alloc_contig_freed

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Message-ID: <op.vs8awkrx3l0zgt@mnazarewicz-glaptop>
Date:	Fri, 01 Apr 2011 00:18:10 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Dave Hansen" <dave@...ux.vnet.ibm.com>
Cc:	"Marek Szyprowski" <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-media@...r.kernel.org,
	linux-mm@...ck.org, "Kyungmin Park" <kyungmin.park@...sung.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Ankita Garg" <ankita@...ibm.com>,
	"Daniel Walker" <dwalker@...eaurora.org>,
	"Johan MOSSBERG" <johan.xx.mossberg@...ricsson.com>,
	"Mel Gorman" <mel@....ul.ie>, "Pawel Osciak" <pawel@...iak.com>
Subject: Re: [PATCH 04/12] mm: alloc_contig_freed_pages() added

> On Thu, 2011-03-31 at 15:16 +0200, Marek Szyprowski wrote:
>> +unsigned long alloc_contig_freed_pages(unsigned long start, unsigned
>> long end,
>> +                                      gfp_t flag)
>> +{
>> +       unsigned long pfn = start, count;
>> +       struct page *page;
>> +       struct zone *zone;
>> +       int order;
>> +
>> +       VM_BUG_ON(!pfn_valid(start));

On Thu, 31 Mar 2011 23:14:38 +0200, Dave Hansen wrote:
> We BUG_ON() in bootmem.  Basically if we try to allocate an early-boot
> structure and fail, we're screwed.  We can't keep running without an
> inode hash, or a mem_map[].
>
> This looks like it's going to at least get partially used in drivers, at
> least from the examples.  Are these kinds of things that, if the driver
> fails to load, that the system is useless and hosed?  Or, is it
> something where we might limp along to figure out what went wrong before
> we reboot?

Bug in the above place does not mean that we could not allocate memory.  It
means caller is broken.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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