linux-kernel - sparsemem usage

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Message-ID: <20060802134413.63901.qmail@web25814.mail.ukl.yahoo.com>
Date:	Wed, 2 Aug 2006 13:44:13 +0000 (GMT)
From:	moreau francis <francis_moreau2000@...oo.fr>
To:	linux-kernel@...r.kernel.org
Cc:	apw@...dowen.org
Subject: sparsemem usage

My board has a really weird mem mapping.

MEM1: 0xc000 0000 - 32 Mo
MEM2: 0xd000 0000 - 8 Mo
MEM3: 0xd800 0000 - 128 Ko

MEM3 has interesting properties, such as speed and security,
and I really need to use it.

I think that sparsemem can deal with such mapping. But I
encounter an issue when choosing the section bit size. I choose
SECTION_SIZE_BITS = 17. Therefore the section size is
equal to the smallest size of my memories. But I get a
compilation error which is due to this:

#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
#error Allocator MAX_ORDER exceeds SECTION_SIZE
#endif

I'm not sure to understand why there's such check. To fix this
I should change MAX_ORDER to 6.

Is it the only way to fix that ?

Thanks

Francis

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