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authorDave Hansen <haveblue@us.ibm.com>2005-06-23 00:07:41 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:01 -0700
commit5b505b90b2d54e526cc8d123bdef3b98c9f0bbc6 (patch)
treec56ce2547e654eb0a2166171ba8ca19eaa8cd65f /arch/i386/mm/discontig.c
parent348f8b6c4837a07304d2f72b11ce8d96588065e0 (diff)
[PATCH] sparsemem base: teach discontig about sparse ranges
discontig.c has some assumptions that mem_map[]s inside of a node are contiguous. Teach it to make sure that each region that it's bringing online is actually made up of valid ranges of ram. Written-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/mm/discontig.c')
-rw-r--r--arch/i386/mm/discontig.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index dcc71f969b0..088ca472218 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -216,6 +216,7 @@ static unsigned long calculate_numa_remap_pages(void)
{
int nid;
unsigned long size, reserve_pages = 0;
+ unsigned long pfn;
for_each_online_node(nid) {
/*
@@ -234,6 +235,19 @@ static unsigned long calculate_numa_remap_pages(void)
size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
/* now the roundup is correct, convert to PAGE_SIZE pages */
size = size * PTRS_PER_PTE;
+
+ /*
+ * Validate the region we are allocating only contains valid
+ * pages.
+ */
+ for (pfn = node_end_pfn[nid] - size;
+ pfn < node_end_pfn[nid]; pfn++)
+ if (!page_is_ram(pfn))
+ break;
+
+ if (pfn != node_end_pfn[nid])
+ size = 0;
+
printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
size, nid);
node_remap_size[nid] = size;