From fb6d73d3014babb69f5cc2d1d78b31e9d09fc5df Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Wed, 16 Nov 2005 11:43:26 +1100 Subject: [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 Signed-off-by: Linus Torvalds --- arch/powerpc/mm/numa.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/mm/numa.c') diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index bd2cf133688..f72cf87364c 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); } -- cgit v1.2.3