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authorPaul Mackerras <paulus@samba.org>2005-11-16 01:43:26 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-16 01:57:12 +0100
commitfb6d73d3014babb69f5cc2d1d78b31e9d09fc5df (patch)
tree9d8ee68b8754fc57948098945113871aee0b23bb /arch
parent[PATCH] ia64: cpu_idle performance bug fix (diff)
downloadlinux-fb6d73d3014babb69f5cc2d1d78b31e9d09fc5df.tar.xz
linux-fb6d73d3014babb69f5cc2d1d78b31e9d09fc5df.zip
[PATCH] powerpc: Fix sparsemem with memory holes [was Re: ppc64 oops..]
This patch should fix the crashes we have been seeing on 64-bit powerpc systems with a memory hole when sparsemem is enabled. I'd appreciate it if people who know more about NUMA and sparsemem than me could look over it. There were two bugs. The first was that if NUMA was enabled but there was no NUMA information for the machine, the setup_nonnuma() function was adding a single region, assuming memory was contiguous. The second was that the loops in mem_init() and show_mem() assumed that all pages within the span of a pgdat were valid (had a valid struct page). I also fixed the incorrect setting of num_physpages that Mike Kravetz pointed out. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/mem.c8
-rw-r--r--arch/powerpc/mm/numa.c5
2 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index e2c95fcb8055..4bd7b0a70996 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -200,6 +200,8 @@ void show_mem(void)
unsigned long flags;
pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; i++) {
+ if (!pfn_valid(pgdat->node_start_pfn + i))
+ continue;
page = pgdat_page_nr(pgdat, i);
total++;
if (PageHighMem(page))
@@ -336,7 +338,7 @@ void __init mem_init(void)
struct page *page;
unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
- num_physpages = max_pfn; /* RAM is assumed contiguous */
+ num_physpages = lmb.memory.size >> PAGE_SHIFT;
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
#ifdef CONFIG_NEED_MULTIPLE_NODES
@@ -348,11 +350,13 @@ void __init mem_init(void)
}
}
#else
- max_mapnr = num_physpages;
+ max_mapnr = max_pfn;
totalram_pages += free_all_bootmem();
#endif
for_each_pgdat(pgdat) {
for (i = 0; i < pgdat->node_spanned_pages; i++) {
+ if (!pfn_valid(pgdat->node_start_pfn + i))
+ continue;
page = pgdat_page_nr(pgdat, i);
if (PageReserved(page))
reservedpages++;
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index bd2cf1336885..f72cf87364cb 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -483,6 +483,7 @@ static void __init setup_nonnuma(void)
{
unsigned long top_of_ram = lmb_end_of_DRAM();
unsigned long total_ram = lmb_phys_mem_size();
+ unsigned int i;
printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
top_of_ram, total_ram);
@@ -490,7 +491,9 @@ static void __init setup_nonnuma(void)
(top_of_ram - total_ram) >> 20);
map_cpu_to_node(boot_cpuid, 0);
- add_region(0, 0, lmb_end_of_DRAM() >> PAGE_SHIFT);
+ for (i = 0; i < lmb.memory.cnt; ++i)
+ add_region(0, lmb.memory.region[i].base >> PAGE_SHIFT,
+ lmb_size_pages(&lmb.memory, i));
node_set_online(0);
}