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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
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>
-rw-r--r--arch/i386/mm/discontig.c14
-rw-r--r--arch/i386/mm/init.c2
-rw-r--r--include/asm-i386/page.h2
3 files changed, 17 insertions, 1 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;
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 8766c771bb4..666ca79fb50 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -191,7 +191,7 @@ static inline int page_kills_ppro(unsigned long pagenr)
extern int is_available_memory(efi_memory_desc_t *);
-static inline int page_is_ram(unsigned long pagenr)
+int page_is_ram(unsigned long pagenr)
{
int i;
unsigned long addr, end;
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h
index 41400d342d4..8f3dded01bf 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -120,6 +120,8 @@ static __inline__ int get_order(unsigned long size)
extern int sysctl_legacy_va_layout;
+extern int page_is_ram(unsigned long pagenr);
+
#endif /* __ASSEMBLY__ */
#ifdef __ASSEMBLY__