add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/balloon.c
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@@ -46,7 +46,7 @@
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 #include <linux/freezer.h>
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 #include <linux/kthread.h>
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 #include <linux/mm.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/pagemap.h>
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 #include <linux/highmem.h>
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 #include <linux/mutex.h>
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@@ -61,8 +61,6 @@
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 #include <linux/moduleparam.h>
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 #include <asm/page.h>
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-#include <asm/pgalloc.h>
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-#include <asm/pgtable.h>
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 #include <asm/tlb.h>
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 #include <asm/xen/hypervisor.h>
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@@ -86,9 +84,6 @@
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 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
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-static int zero;
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-static int one = 1;
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-
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 static struct ctl_table balloon_table[] = {
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 	{
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 		.procname	= "hotplug_unpopulated",
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@@ -96,8 +91,8 @@
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 		.maxlen		= sizeof(int),
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 		.mode		= 0644,
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 		.proc_handler	= proc_dointvec_minmax,
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-		.extra1         = &zero,
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-		.extra2         = &one,
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+		.extra1         = SYSCTL_ZERO,
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+		.extra2         = SYSCTL_ONE,
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 	},
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 	{ }
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 };
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@@ -166,8 +161,10 @@
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 	(GFP_HIGHUSER | __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC)
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 /* balloon_append: add the given page to the balloon. */
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-static void __balloon_append(struct page *page)
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+static void balloon_append(struct page *page)
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 {
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+	__SetPageOffline(page);
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+
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 	/* Lowmem is re-populated first, so highmem pages go at list tail. */
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 	if (PageHighMem(page)) {
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 		list_add_tail(&page->lru, &ballooned_pages);
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@@ -177,11 +174,6 @@
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 		balloon_stats.balloon_low++;
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 	}
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 	wake_up(&balloon_wq);
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-}
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-
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-static void balloon_append(struct page *page)
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-{
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-	__balloon_append(page);
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 }
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 /* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
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@@ -202,6 +194,7 @@
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 	else
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 		balloon_stats.balloon_low--;
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+	__ClearPageOffline(page);
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 	return page;
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 }
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@@ -277,20 +270,6 @@
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 		return NULL;
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 	}
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-#ifdef CONFIG_SPARSEMEM
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-	{
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-		unsigned long limit = 1UL << (MAX_PHYSMEM_BITS - PAGE_SHIFT);
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-		unsigned long pfn = res->start >> PAGE_SHIFT;
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-
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-		if (pfn > limit) {
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-			pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n",
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-			       pfn, limit);
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-			release_memory_resource(res);
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-			return NULL;
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-		}
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-	}
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-#endif
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-
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 	return res;
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 }
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@@ -357,7 +336,7 @@
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 	mutex_unlock(&balloon_mutex);
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 	/* add_memory_resource() requires the device_hotplug lock */
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 	lock_device_hotplug();
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-	rc = add_memory_resource(nid, resource, memhp_auto_online);
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+	rc = add_memory_resource(nid, resource, MEMHP_MERGE_RESOURCE);
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 	unlock_device_hotplug();
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 	mutex_lock(&balloon_mutex);
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@@ -374,14 +353,18 @@
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 	return BP_ECANCELED;
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 }
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-static void xen_online_page(struct page *page)
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+static void xen_online_page(struct page *page, unsigned int order)
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 {
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-	__online_page_set_limits(page);
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+	unsigned long i, size = (1 << order);
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+	unsigned long start_pfn = page_to_pfn(page);
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+	struct page *p;
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+	pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn);
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 	mutex_lock(&balloon_mutex);
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-
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-	__balloon_append(page);
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-
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+	for (i = 0; i < size; i++) {
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+		p = pfn_to_page(start_pfn + i);
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+		balloon_append(p);
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+	}
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 	mutex_unlock(&balloon_mutex);
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 }
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@@ -704,12 +687,11 @@
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 }
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 EXPORT_SYMBOL(free_xenballooned_pages);
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-#ifdef CONFIG_XEN_PV
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+#if defined(CONFIG_XEN_PV) && !defined(CONFIG_XEN_UNPOPULATED_ALLOC)
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 static void __init balloon_add_region(unsigned long start_pfn,
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 				      unsigned long pages)
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 {
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 	unsigned long pfn, extra_pfn_end;
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-	struct page *page;
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 	/*
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 	 * If the amount of usable memory has been limited (e.g., with
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@@ -719,11 +701,10 @@
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 	extra_pfn_end = min(max_pfn, start_pfn + pages);
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 	for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
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-		page = pfn_to_page(pfn);
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 		/* totalram_pages and totalhigh_pages do not
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 		   include the boot-time balloon extension, so
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 		   don't subtract from it. */
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-		__balloon_append(page);
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+		balloon_append(pfn_to_page(pfn));
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 	}
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 	balloon_stats.total_pages += extra_pfn_end - start_pfn;
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@@ -762,7 +743,7 @@
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 	register_sysctl_table(xen_root);
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 #endif
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-#ifdef CONFIG_XEN_PV
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+#if defined(CONFIG_XEN_PV) && !defined(CONFIG_XEN_UNPOPULATED_ALLOC)
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 	{
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 		int i;
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