From 6f712711dbd180aa3777efe5ae3b9b0e915b9471 Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki Date: Sat, 5 Aug 2006 12:14:58 -0700 Subject: [PATCH] [PATCH] memory hotadd fixes: not-aligned memory hotadd handling fix ioresouce handling code in memory hotplug allows not-aligned memory hot add. But when memmap and other memory structures are initialized, parameters should be aligned. (if not aligned, initialization of mem_map will do wrong, it assumes parameters are aligned.) This patch fix it. And this patch allows ioresource collision check to handle -EEXIST. Signed-off-by: KAMEZAWA Hiroyuki Cc: Keith Mannthey Cc: Yasunori Goto Cc: Dave Hansen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 01c9fb97c619..7d25cc12235f 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -76,15 +76,22 @@ int __add_pages(struct zone *zone, unsigned long phys_start_pfn, { unsigned long i; int err = 0; + int start_sec, end_sec; + /* during initialize mem_map, align hot-added range to section */ + start_sec = pfn_to_section_nr(phys_start_pfn); + end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); - for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) { - err = __add_section(zone, phys_start_pfn + i); + for (i = start_sec; i <= end_sec; i++) { + err = __add_section(zone, i << PFN_SECTION_SHIFT); - /* We want to keep adding the rest of the - * sections if the first ones already exist + /* + * EEXIST is finally dealed with by ioresource collision + * check. see add_memory() => register_memory_resource() + * Warning will be printed if there is collision. */ if (err && (err != -EEXIST)) break; + err = 0; } return err; @@ -213,10 +220,10 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat) } /* add this memory to iomem resource */ -static void register_memory_resource(u64 start, u64 size) +static int register_memory_resource(u64 start, u64 size) { struct resource *res; - + int ret = 0; res = kzalloc(sizeof(struct resource), GFP_KERNEL); BUG_ON(!res); @@ -228,7 +235,9 @@ static void register_memory_resource(u64 start, u64 size) printk("System RAM resource %llx - %llx cannot be added\n", (unsigned long long)res->start, (unsigned long long)res->end); kfree(res); + ret = -EEXIST; } + return ret; } @@ -269,7 +278,7 @@ int add_memory(int nid, u64 start, u64 size) } /* register this memory as resource */ - register_memory_resource(start, size); + ret = register_memory_resource(start, size); return ret; error: -- 2.20.1