From: Martin Schwidefsky <schwidefsky@de.ibm.com>

From: Guillaume Morin <guillaume@morinfr.org>

This patch improves the memory detection logic.  It detects any amount of
holes in the memory layout up to MEMORY_CHUNK blocks of available memory.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>