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[PATCH] mm: use symbolic names instead of indices for zone initialisation

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Arch-independent zone-sizing is using indices instead of symbolic names to
offset within an array related to zones (max_zone_pfns).  The unintended
impact is that ZONE_DMA and ZONE_NORMAL is initialised on powerpc instead
of ZONE_DMA and ZONE_HIGHMEM when CONFIG_HIGHMEM is set.  As a result, the
the machine fails to boot but will boot with CONFIG_HIGHMEM turned off.

The following patch properly initialises the max_zone_pfns[] array and uses
symbolic names instead of indices in each architecture using
arch-independent zone-sizing.  Two users have successfully booted their
powerpcs with it (one an ibook G4).  It has also been boot tested on x86,
x86_64, ppc64 and ia64.  Please merge for 2.6.19-rc2.

Credit to Benjamin Herrenschmidt for identifying the bug and rolling the
first fix.  Additional credit to Johannes Berg and Andreas Schwab for
reporting the problem and testing on powerpc.

Signed-off-by: Mel Gorman <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2006-10-11 01:20:39 -07:00 • committed by Linus Torvalds
commit 6391af174a
9 changed files with 36 additions and 27 deletions
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7
arch/ppc/mm/init.c
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@ -374,11 +374,12 @@ void __init paging_init(void)
end_pfn = start_pfn + (total_memory >> PAGE_SHIFT);
add_active_range(0, start_pfn, end_pfn);
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
#ifdef CONFIG_HIGHMEM
max_zone_pfns[0] = total_lowmem >> PAGE_SHIFT;
max_zone_pfns[1] = total_memory >> PAGE_SHIFT;
max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
max_zone_pfns[ZONE_HIGHMEM] = total_memory >> PAGE_SHIFT;
#else
max_zone_pfns[0] = total_memory >> PAGE_SHIFT;
max_zone_pfns[ZONE_DMA] = total_memory >> PAGE_SHIFT;
#endif /* CONFIG_HIGHMEM */
free_area_init_nodes(max_zone_pfns);
}