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 brining
online is actually made up of valid ranges of ram.
Written-by: Andy Whitcroft <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
---
memhotplug-dave/arch/i386/mm/discontig.c | 14 ++++++++++++++
memhotplug-dave/arch/i386/mm/init.c | 2 +-
memhotplug-dave/include/asm-i386/page.h | 2 ++
3 files changed, 17 insertions(+), 1 deletion(-)
diff -puN arch/i386/mm/discontig.c~FROM-MM-validate-remap-pages arch/i386/mm/discontig.c
--- memhotplug/arch/i386/mm/discontig.c~FROM-MM-validate-remap-pages 2005-03-25 08:17:10.000000000 -0800
+++ memhotplug-dave/arch/i386/mm/discontig.c 2005-03-25 08:17:10.000000000 -0800
@@ -185,6 +185,7 @@ static unsigned long calculate_numa_rema
{
int nid;
unsigned long size, reserve_pages = 0;
+ unsigned long pfn;
for_each_online_node(nid) {
if (nid == 0)
@@ -208,6 +209,19 @@ static unsigned long calculate_numa_rema
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 -puN arch/i386/mm/init.c~FROM-MM-validate-remap-pages arch/i386/mm/init.c
--- memhotplug/arch/i386/mm/init.c~FROM-MM-validate-remap-pages 2005-03-25 08:17:10.000000000 -0800
+++ memhotplug-dave/arch/i386/mm/init.c 2005-03-25 08:17:10.000000000 -0800
@@ -191,7 +191,7 @@ static inline int page_kills_ppro(unsign
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 -puN include/asm-i386/page.h~FROM-MM-validate-remap-pages include/asm-i386/page.h
--- memhotplug/include/asm-i386/page.h~FROM-MM-validate-remap-pages 2005-03-25 08:17:10.000000000 -0800
+++ memhotplug-dave/include/asm-i386/page.h 2005-03-25 08:17:10.000000000 -0800
@@ -119,6 +119,8 @@ static __inline__ int get_order(unsigned
extern int sysctl_legacy_va_layout;
+extern int page_is_ram(unsigned long pagenr);
+
#endif /* __ASSEMBLY__ */
#ifdef __ASSEMBLY__
_
-
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