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Subject[PATCH 10/11] memory hotplug: i386 addition functions
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Date

Adds the necessary for non-NUMA hot-add of highmem
to an existing zone on i386.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---
memhotplug-dave/arch/i386/mm/discontig.c | 4 +-
memhotplug-dave/arch/i386/mm/init.c | 61 ++++++++++++++++++++++++++++---
2 files changed, 58 insertions(+), 7 deletions(-)
diff -puN arch/i386/mm/discontig.c~D1-i386-hotplug-functions arch/i386/mm/discontig.c
--- memhotplug/arch/i386/mm/discontig.c~D1-i386-hotplug-functions 2005-08-18 14:59:50.000000000 -0700
+++ memhotplug-dave/arch/i386/mm/discontig.c 2005-08-18 14:59:50.000000000 -0700
@@ -98,7 +98,7 @@ unsigned long node_memmap_size_bytes(int

extern unsigned long find_max_low_pfn(void);
extern void find_max_pfn(void);
-extern void one_highpage_init(struct page *, int, int);
+extern void add_one_highpage_init(struct page *, int, int);

extern struct e820map e820;
extern unsigned long init_pg_tables_end;
@@ -427,7 +427,7 @@ void __init set_highmem_pages_init(int b
if (!pfn_valid(node_pfn))
continue;
page = pfn_to_page(node_pfn);
- one_highpage_init(page, node_pfn, bad_ppro);
+ add_one_highpage_init(page, node_pfn, bad_ppro);
}
}
totalram_pages += totalhigh_pages;
diff -puN arch/i386/mm/init.c~D1-i386-hotplug-functions arch/i386/mm/init.c
--- memhotplug/arch/i386/mm/init.c~D1-i386-hotplug-functions 2005-08-18 14:59:50.000000000 -0700
+++ memhotplug-dave/arch/i386/mm/init.c 2005-08-18 14:59:50.000000000 -0700
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/efi.h>
+#include <linux/memory_hotplug.h>

#include <asm/processor.h>
#include <asm/system.h>
@@ -265,17 +266,45 @@ static void __init permanent_kmaps_init(
pkmap_page_table = pte;
}

-void __init one_highpage_init(struct page *page, int pfn, int bad_ppro)
+void __devinit free_new_highpage(struct page *page)
+{
+ set_page_count(page, 1);
+ __free_page(page);
+ totalhigh_pages++;
+}
+
+void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
{
if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
ClearPageReserved(page);
- set_page_count(page, 1);
- __free_page(page);
- totalhigh_pages++;
} else
SetPageReserved(page);
}

+int add_one_highpage_hotplug(struct page *page, int pfn)
+{
+ free_new_highpage(page);
+ totalram_pages++;
+#ifdef CONFIG_FLATMEM
+ max_mapnr = max(pfn, max_mapnr);
+#endif
+ num_physpages++;
+ return 0;
+}
+
+/*
+ * Not currently handling the NUMA case.
+ * Assuming single node and all memory that
+ * has been added dynamically that would be
+ * onlined here is in HIGHMEM
+ */
+void online_page(struct page *page)
+{
+ ClearPageReserved(page);
+ add_one_highpage_hotplug(page, page_to_pfn(page));
+}
+
+
#ifdef CONFIG_NUMA
extern void set_highmem_pages_init(int);
#else
@@ -283,7 +312,7 @@ static void __init set_highmem_pages_ini
{
int pfn;
for (pfn = highstart_pfn; pfn < highend_pfn; pfn++)
- one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
+ add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
totalram_pages += totalhigh_pages;
}
#endif /* CONFIG_FLATMEM */
@@ -614,6 +643,28 @@ void __init mem_init(void)
#endif
}

+/*
+ * this is for the non-NUMA, single node SMP system case.
+ * Specifically, in the case of x86, we will always add
+ * memory to the highmem for now.
+ */
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+int add_memory(u64 start, u64 size)
+{
+ struct pglist_data *pgdata = &contig_page_data;
+ struct zone *zone = pgdata->node_zones + MAX_NR_ZONES-1;
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ return __add_pages(zone, start_pfn, nr_pages);
+}
+
+int remove_memory(u64 start, u64 size)
+{
+ return -EINVAL;
+}
+#endif
+
kmem_cache_t *pgd_cache;
kmem_cache_t *pmd_cache;

_
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