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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 <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>
This commit is contained in:
Mel Gorman 2006-10-11 01:20:39 -07:00 committed by Linus Torvalds
parent 4e0fadfcf6
commit 6391af174a
9 changed files with 36 additions and 27 deletions
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13
arch/i386/kernel/setup.c
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@ -1083,16 +1083,15 @@ static unsigned long __init setup_memory(void)
void __init zone_sizes_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] =
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
unsigned long max_zone_pfns[MAX_NR_ZONES] = {
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT,
max_low_pfn,
highend_pfn};
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
add_active_range(0, 0, highend_pfn);
#else
unsigned long max_zone_pfns[MAX_NR_ZONES] = {
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT,
max_low_pfn};
add_active_range(0, 0, max_low_pfn);
#endif

11
arch/i386/mm/discontig.c
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@ -356,11 +356,12 @@ void __init numa_kva_reserve(void)
void __init zone_sizes_init(void)
{
int nid;
unsigned long max_zone_pfns[MAX_NR_ZONES] = {
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT,
max_low_pfn,
highend_pfn
};
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] =
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
/* If SRAT has not registered memory, register it now */
if (find_max_pfn_with_active_regions() == 0) {

1
arch/ia64/mm/contig.c
View File

@ -233,6 +233,7 @@ paging_init (void)
efi_memmap_walk(count_pages, &num_physpages);
max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] = max_dma;
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

1
arch/ia64/mm/discontig.c
View File

@ -709,6 +709,7 @@ void __init paging_init(void)
max_pfn = mem_data[node].max_pfn;
}
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] = max_dma;
max_zone_pfns[ZONE_NORMAL] = max_pfn;
free_area_init_nodes(max_zone_pfns);

7
arch/powerpc/mm/mem.c
View File

@ -307,11 +307,12 @@ void __init paging_init(void)
top_of_ram, total_ram);
printk(KERN_DEBUG "Memory hole size: %ldMB\n",
(top_of_ram - total_ram) >> 20);
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
#ifdef CONFIG_HIGHMEM
max_zone_pfns[0] = total_lowmem >> PAGE_SHIFT;
max_zone_pfns[1] = top_of_ram >> PAGE_SHIFT;
max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
#else
max_zone_pfns[0] = top_of_ram >> PAGE_SHIFT;
max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
#endif
free_area_init_nodes(max_zone_pfns);
}

6
arch/powerpc/mm/numa.c
View File

@ -617,9 +617,9 @@ void __init do_init_bootmem(void)
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES] = {
lmb_end_of_DRAM() >> PAGE_SHIFT
};
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] = lmb_end_of_DRAM() >> PAGE_SHIFT;
free_area_init_nodes(max_zone_pfns);
}

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);
}

9
arch/x86_64/mm/init.c
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@ -406,9 +406,12 @@ void __cpuinit zap_low_mappings(int cpu)
#ifndef CONFIG_NUMA
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES] = {MAX_DMA_PFN,
MAX_DMA32_PFN,
end_pfn};
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
max_zone_pfns[ZONE_NORMAL] = end_pfn;
memory_present(0, 0, end_pfn);
sparse_init();
free_area_init_nodes(max_zone_pfns);

8
arch/x86_64/mm/numa.c
View File

@ -338,9 +338,11 @@ static void __init arch_sparse_init(void)
void __init paging_init(void)
{
int i;
unsigned long max_zone_pfns[MAX_NR_ZONES] = { MAX_DMA_PFN,
MAX_DMA32_PFN,
end_pfn};
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
max_zone_pfns[ZONE_NORMAL] = end_pfn;
arch_sparse_init();