linux-kernel - Re: [PATCH 1/1] crash_dump: fix non-pae kdump kernel memory accesses

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Date:	Mon, 26 Oct 2009 11:12:30 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 1/1] crash_dump: fix non-pae kdump kernel memory accesses

On 10/25/2009 05:20 PM, Ingo Molnar wrote:
>> +#ifndef CONFIG_X86_PAE
>> +/* non-PAE kdump kernel executed from a PAE one will crop high pte bits and
>> +   poke unwanted space counting again from address 0, we don't want that */
>> +static inline bool is_crashed_pfn_valid(unsigned long pfn)
>> +{
>> +	/* on non-PAE pte must fit into unsigned long
>> +	   in fact the test is (pfn & 0x000fffff) */
>> +	return pte_pfn(pfn_pte(pfn, __pgprot(0))) == pfn;
>> +}
>> +#else
>> +static inline bool is_crashed_pfn_valid(unsigned long pfn) { return true; }
>> +#endif
> 
> i'd suggest to push the #ifdef inside the function.

I posted a v2 patch a second ago. Thanks.
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