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authorMel Gorman <mel@csn.ul.ie>2006-10-11 01:20:39 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-11 11:14:14 -0700
commit6391af174ad75f72e92043c1dd8302660a2fec58 (patch)
tree43dfb9a1acfbdabb820180834d4e8efdcfcbe46e /arch/ppc/mm
parent4e0fadfcf62e252d2b14de0e0927eb2830c0c28c (diff)
downloadlinux-linaro-stable-6391af174ad75f72e92043c1dd8302660a2fec58.tar.gz
[PATCH] mm: use symbolic names instead of indices for zone initialisation
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 <mel@csn.ul.ie> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/mm')
-rw-r--r--arch/ppc/mm/init.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/ppc/mm/init.c b/arch/ppc/mm/init.c
index 410200046af1..c374e53ae03a 100644
--- a/arch/ppc/mm/init.c
+++ b/arch/ppc/mm/init.c
@@ -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);
}