linux-kernel - Re: [PATCH v7 26/27] x86: add Crash kernel low reservation

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Message-ID: <CAE9FiQW_CO19Un3YBkZpeP0wzFf4GNMuz3UMyhJxxqDniCLP=Q@mail.gmail.com>
Date:	Wed, 19 Dec 2012 09:36:31 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 26/27] x86: add Crash kernel low reservation

On Wed, Dec 19, 2012 at 9:22 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Mon, Dec 17, 2012 at 11:15:58PM -0800, Yinghai Lu wrote:
>> +static u64 __init get_mem_size(unsigned long limit_pfn)
>> +{
>> +     int i;
>> +     u64 pages = 0;
>> +     unsigned long start_pfn, end_pfn;
>> +
>> +     for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
>> +             start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
>> +             end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
>> +             pages += end_pfn - start_pfn;
>> +     }
>> +
>> +     return pages << PAGE_SHIFT;
>> +}
>
> This needs an empty function prototype for the .config variant where both
>
> # CONFIG_BLK_DEV_INITRD is not set
> # CONFIG_KEXEC is not set
>
> otherwise:
>
> arch/x86/kernel/setup.c:295:19: warning: ‘get_mem_size’ defined but not used [-Wunused-function]
>
> At a second glance though, a better fix might be if that whole
> if-deffery in setup.c could be cleaned up a bit.
>

ok,  will move the function into e820.c or memblock.c

Thanks

Yinghai
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